{"title":"Mercury Outboard Lower Unit Assemblies, Prop Shafts, and Transmission Components","description":"\u003ch2\u003e\u003cstrong\u003eMercury Marine Engine Lower Unit Assemblies, Prop Shafts, and Transmission Components Resources and Information\u003c\/strong\u003e\u003c\/h2\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eOur complete selection of Mercury outboard lower unit assemblies, prop shafts, and transmission components are intended to replace your old or broken \u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/collections\/mercury-outboard-parts\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eMercury outboard parts\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e. Need help performing maintenance on your Mercury outboard lower unit? Follow along with our \u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/mercury-4-stroke-100-hour-service-step-4-lower-unit\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eMercury Lower Unit 4-Stroke 100-Hour Service\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e guide over on our blog.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWe also regularly publish helpful resources to help you maintain your Mercury outboard motor, such as:\u003c\/span\u003e\u003c\/p\u003e \u003cul\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/pages\/mercury-outboard-engine-oil-capacities-and-oil-filter-chart\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eMercury Outboard Specs \u0026amp; Capacities Chart\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/where-can-i-find-my-mercury-outboard-serial-number\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eMercury Outboard Serial Number Lookup\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/pages\/download-mercury-100-hour-maintenance-guides?___store=default\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eMercury Outboard 100-hour Service Guides\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003e\u003cstrong\u003eMercury Outboard Lower Unit Assemblies, Prop Shafts, and Transmission Components FAQs\u003c\/strong\u003e\u003c\/h2\u003e \u003ch3\u003e\u003cstrong\u003eWhat is a Mercury outboard lower unit assembly? \u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eAlso commonly called a gearcase, an outboard lower unit assembly transfers the rotational energy from the outboard engine and transfers it to the propeller, causing it to rotate and move the boat. The lower unit houses several essential components, without which you’re boat couldn’t move through the water.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow do I service my Mercury 4-stroke outboard lower unit? \u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eUse an appropriately sized screwdriver assisted by a wrench if necessary to loosen these screws which should be pretty tight. An impact driver and hammer might be needed. If the drain screw has a magnetic tip, inspect the plug after removal to see if heavy deposits exist. Some fine shavings are normal, but chunks or a large quantity of metal is cause for further inspection. Have a drain pan ready, and extra rags handy as gear lube will begin running down the skeg as soon as you remove the upper vent plug. Be sure to collect the used gaskets from both plugs after removal as these are not reusable and should be discarded.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eAllow several minutes with the engine tilted all the way down to drain all the old gear oil fully. Like your engine oil, inspect the spent oil for evidence of water intrusion, other contamination, or metal. If you have purchased one of PartsVu’s handy lower unit oil change kits, you will already have new gaskets, oil, and a pump. Screw the pump into the lower drain hole, then connect it to the container of gear oil.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eBegin pumping oil into the \u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/mercury-4-stroke-100-hour-service-step-4-lower-unit\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eMercury lower unit\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e until oil begins to flow from the vent plug at the top. Stop pumping and wait a few minutes for all the air bubbles to work themselves out of the gearcase. After this brief pause, pump a few more times until clean gear oil without bubbles is flowing from the vent plug. With a fresh gasket in place, install and torque the top vent plug. Unscrew your fill hose from the lower drain plug and quickly swap in the lower drain plug with a new gasket — torque to spec.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eBefore you do get started on any maintenance projects, make sure to get the right parts (even for\u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/collections\/mercruiser-parts\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e Mercruiser engines\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e) so you don’t have to stop right in the middle.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow do I service my Mercury 2-stroke outboard lower unit? \u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eUse an appropriately sized screwdriver assisted by a wrench if necessary to loosen these screws which should be pretty tight. An impact driver and hammer might be needed. If the drain screw has a magnetic tip, inspect the plug after removal to see if heavy deposits exist. Some fine shavings are normal, but chunks or a large quantity of metal is cause for further inspection. Have a drain pan ready, and extra rags handy as gear lube will begin running down the skeg as soon as you remove the upper vent plug. Be sure to collect the used gaskets from both plugs after removal as these are not reusable and should be discarded.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eAllow several minutes with the engine tilted all the way down to drain all the old gear oil fully. Like your engine oil, inspect the spent oil for evidence of water intrusion, other contamination, or metal. If you have purchased one of PartsVu’s handy lower unit\u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/collections\/mercury-marine-four-stroke-outboard-oil-change-kits\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e oil change kits\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e, you will already have new gaskets, oil, and a pump. Screw the pump into the lower drain hole, then connect it to the container of gear oil.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eBegin pumping oil into the Mercury 2-stroke lower unit until oil begins to flow from the vent plug at the top. Stop pumping and wait a few minutes for all the air bubbles to work themselves out of the gearcase. After this brief pause, pump a few more times until clean gear oil without bubbles is flowing from the vent plug. With a fresh gasket in place, install and torque the top vent plug. Unscrew your fill hose from the lower drain plug and quickly swap in the lower drain plug with a new gasket — torque to spec.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e \u003cstrong\u003eHow do I \u003c\/strong\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/how-to-select-the-right-mercury-outboard-parts\"\u003e\u003cstrong\u003eselect the right parts\u003c\/strong\u003e\u003c\/a\u003e\u003cstrong\u003e for my Yamaha outboard motor?\u003c\/strong\u003e \u003c\/h3\u003e \u003cp\u003e\u003ca href=\"https:\/\/partsvu.com\/collections\/mercury-outboard-parts?itm_source=blog-how-to-select-the-right-mercury-outboard-parts%3Fitm_medium%3Din-text%3Fitm_campaign%3Dmercury-parts\"\u003e\u003cspan style=\"font-weight: 400;\"\u003ePartsVu’s Mercury Outboard Maintenance Parts Library\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e is the perfect reference when you need to replace common parts. That’s because these parts charts make it simple to find the right parts for your particular engine to perform regularly-scheduled maintenance. \u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eFor \u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/collections\/mercury-marine-outboard-motors\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eMercury outboard motors\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e, perform maintenance after 100 hours of service or one year of operation (whichever comes first). More extensive service is recommended after \u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/collections\/mercury-outboard-complete-100-300-hour-service-kits\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e300 hours of service\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e or three years.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eAfter this period, maintenance is often more regular as the engine ages and parts wear out. For example, 1,000 hours generally requires an in-depth assessment by a qualified mechanic. Also, if you’re usually running your Mercury outboard in a more demanding manner, the manufacturer recommends more frequent servicing.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe following maintenance parts charts are organized by each model number for Mercury’s line of outboard engines.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow do I install a propeller on my Mercury outboard engine?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWhile many believe that \u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/how-to-change-a-mercury-marine-propeller\"\u003e\u003cspan style=\"font-weight: 400;\"\u003einstalling a new propeller\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e on a Mercury outboard is a tedious and cumbersome task, it is not the case. In fact, armed with the right knowledge, one can conveniently pull off the task of installing a new prop within a few minutes!\u003c\/span\u003e\u003c\/p\u003e \u003col\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eUsing a screwdriver, push down the two bent-up tabs that are holding down the propeller nut.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eInsert prop stop to prevent spinning.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eOpen lock nut retainer with Flat Screwdriver.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eRemove prop nut.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eRemove locknut retainer.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eRemove drive sleeve adapter.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eRemove drive sleeve from the boat propeller.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eRemove forward thrust washer.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eClean any debris or old fishing line around the prop shaft.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eThen inspect the shaft and analyze if it needs to be greased. If it does, coat a thin, even layer of Mercury 2-4-C grease on all the splines.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eSelect replacement propeller\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eInstall forward thrust washer\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eSlide drive sleeve into the propeller\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eInsert drive sleeve adapter\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eSlide the new propeller on the prop shaft\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eSlide locknut retainer on prop shaft\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eInsert prop stop to prevent spinning\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eTighten propeller nut\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eFinish with torque wrench, and tighten the nut further until you hear a click sound.\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eClose locknut retainer against locknut\u003c\/span\u003e\u003c\/li\u003e \u003c\/ol\u003e \u003ch3\u003e\u003cstrong\u003eHow often should you change your prop?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eIn general, it is recommended to change a boat prop if one or more of the blade edges are chipped or broken by over 15%. In case the propeller is in good condition, and the blades haven’t suffered any damage, you can continue using the same without the need to change it.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow tight should a propeller nut be?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eFor a propeller nut to be accurately placed, it is crucial that the half prop nut is first installed and tightened to be just snug enough to preload it onto the prop shaft, against the hub. Next, the thick prop nut goes onto the shaft. All you need to make sure is that the propeller nut is tight enough, so as not to come off due to any vibration.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eIs it easy to change a boat prop?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eYes, it definitely easy to change propellers. The steps are quite simple and usually can be completed within 30 minutes or so.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow often should I grease my Mercury outboard grease points?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eYou must \u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/mercury-outboard-grease-points-heres-how\"\u003e\u003cspan style=\"font-weight: 400;\"\u003egrease all points\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e at regular service intervals—minimally, annually. Saltwater boaters need to lubricate much more frequently as saltwater breaks down grease, and saltwater on non lubricated surfaces causes a great deal of damage.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eRefer to your owner’s manual to locate all the grease fittings on your specific engine. Most will be easy to find, but a couple are likely tucked away and are not quite as visible. While you must familiarize yourself with the grease fittings on your specific engine, common grease fitting points include:\u003c\/span\u003e\u003c\/p\u003e \u003cul\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eSteering friction adjustment shaft (tiller handle models) \u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eSwivel bracket\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eTilt tube\u003c\/span\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eSteering cable grease fitting\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eTo add grease, first wipe off the grease fitting before attaching the grease gun nozzle to avoid pumping dirt and debris into the grease point. Also, you may have to remove rust and other debris clogging\/blocking grease fittings. \u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003ePump grease into the fitting until grease begins oozing out of the exit points of the area being greased. The old grease will be pushed out as it is being dislocated by the new grease. Wipe off the old grease with your rag.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWhen a given grease point is full, leave a bit of grease on top of the grease fitting to keep rust and other debris from accumulating. Wipe off any excess grease with your rag, then move to the next grease fitting.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWhile not needed for all scenarios, it is worth noting that Mercury’s High Performance Extreme Grease is formulated for high temperature and high load applications and 100% compatible with lithium-based greases.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhich Mercury lower unit parts are most prone to failure?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThere are several Mercury lower unit parts that are more prone to failure than others due to their location and exposure to stress. Here are some of the most common ones:\u003c\/span\u003e\u003c\/p\u003e \u003ch4\u003e\u003cstrong\u003eMercury Lower unit seals\u003c\/strong\u003e\u003c\/h4\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThese are located between the upper and lower sections of the lower unit and can fail due to wear and tear or damage from impact.\u003c\/span\u003e\u003c\/p\u003e \u003ch4\u003e\u003cstrong\u003eMercury Propeller shaft\u003c\/strong\u003e\u003c\/h4\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThis is a critical part that can become damaged due to corrosion, wear, or impact, which can lead to propeller vibration or even complete failure.\u003c\/span\u003e\u003c\/p\u003e \u003ch4\u003e \u003cstrong\u003eMercury \u003c\/strong\u003e\u003ca href=\"https:\/\/partsvu.com\/collections\/mercury-and-mercruiser-outboard-water-pump-repair-kits\"\u003e\u003cstrong\u003eWater pump\u003c\/strong\u003e\u003c\/a\u003e\u003cstrong\u003e impeller\u003c\/strong\u003e \u003c\/h4\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThis is responsible for circulating cooling water through the engine and can wear out over time, especially if the engine runs in shallow or dirty water.\u003c\/span\u003e\u003c\/p\u003e \u003ch4\u003e\u003cstrong\u003eMercury Gearcase bearings\u003c\/strong\u003e\u003c\/h4\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThese are located within the gearcase and are responsible for supporting the propeller shaft. They can become worn or damaged due to corrosion, impact, or lack of lubrication.\u003c\/span\u003e\u003c\/p\u003e \u003ch4\u003e\u003cstrong\u003eMercury Shift shaft\u003c\/strong\u003e\u003c\/h4\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThis is responsible for engaging and disengaging the gears and can become damaged due to corrosion or impact.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhere can I learn more about Mercury outboard parts?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003ePartsVu understands that boaters want to learn how to perform their own Mercury outboard maintenance. From maintaining your Mercury outboard, Mercury sterndrive, and MerCruiser engines, there’s always something new to learn and save money. That’s why PartsVu offers our comprehensive blog, \u003c\/span\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe Partsvu Xchange\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"font-weight: 400;\"\u003e. \u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eRead up on the latest developments in boating, as well as search for everything you need to know about Mercury outboard maintenance.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eTo get you off to a good start, these are some of the most important articles on Mercury Outboard Lower Unit Assemblies, Mercury Outboard Propellor Shafts, Mercury Outboard Transmission Components and more:\u003c\/span\u003e\u003c\/p\u003e \u003cul\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/11-tips-for-yamaha-outboards-that-will-impress-your-mechanic-friends\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e11 Tips for Yamaha Outboards That Will Impress Your ...\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/why-your-outboard-will-not-throttle-up\"\u003e\u003cspan style=\"font-weight: 400;\"\u003e7 Reasons Your Outboard Will Not Throttle Up and How ...\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e \u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/ways-your-yamaha-outboard-engine-will-break-down\"\u003e\u003cspan style=\"font-weight: 400;\"\u003eMost Common Ways Your Yamaha Outboard Engine Will ...\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003e\u003cstrong\u003eWhat should I know about troubleshooting a Mercury 40hp outboard transmission?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eWhen troubleshooting a Mercury 40hp outboard transmission, there are a few things to keep in mind. First, check the gear oil level and color. If the oil level is low, add more oil to the appropriate level. If the oil is dark or has a burnt smell, it may be time to change it. Next, check for any visible signs of damage or wear on the gears and clutch plates. If any of these parts are damaged, they will need to be replaced.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eAnother common issue with Mercury outboard transmissions is slipping or jumping out of gear. This can be caused by worn or damaged shift dogs or shift clutch components. To diagnose this issue, it's best to bring the motor to a qualified mechanic who can disassemble the transmission and inspect the internal components.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eIf you notice a grinding or whining noise when shifting gears, this may indicate a worn or damaged gear. In this case, the affected gear will need to be replaced. It's important to address transmission issues as soon as possible, as they can lead to further damage if left unaddressed.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eFinally, it's important to follow the manufacturer's recommended maintenance schedule for your Mercury outboard engine. Regularly changing the gear oil and inspecting the transmission can help prevent issues from arising in the first place.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhat is the lower unit assembly in a Mercury outboard motor?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe lower unit assembly is the part of the outboard motor that houses the gears, shafts, and propeller. It is responsible for transferring power from the engine to the propeller, which propels the boat through the water.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhat is a prop shaft?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe prop shaft is the component that connects the lower unit assembly to the propeller. It transfers the rotational force from the engine to the propeller, which allows the boat to move through the water.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow often should I service my lower unit assembly?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eIt is recommended that you service your lower unit assembly at least once a year or every 100 hours of operation, whichever comes first. Regular maintenance can help prevent damage and prolong the life of your outboard motor.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhat type of oil should I use in my lower unit assembly?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eIt is recommended to use a high-quality marine-grade gear oil specifically designed for use in outboard motors, such as Mercury's high-performance gear lube.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow often should I change the gear oil in my lower unit assembly?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eIt is recommended to change the gear oil in your lower unit assembly every 100 hours of operation or once a year, whichever comes first. Regularly changing the gear oil can help prevent damage and prolong the life of your outboard motor.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhat is a transmission component in a Mercury outboard motor?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe transmission component is responsible for shifting the gears in the lower unit assembly, which controls the speed and direction of the propeller.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eCan I replace my prop shaft myself?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eIt is recommended to have a professional marine technician replace your prop shaft. However, if you are experienced and knowledgeable in marine mechanics, you can replace the prop shaft yourself.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhat is a lower unit seal kit?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eA lower unit seal kit includes all the necessary seals and gaskets to replace the seals and gaskets in your lower unit assembly, which helps prevent water from entering the lower unit and causing damage.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow often should I replace the seals and gaskets in my lower unit assembly?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eIt is recommended to replace the seals and gaskets in your lower unit assembly every two to three years, or whenever you notice signs of wear or damage. Regular replacement can help prevent water from entering the lower unit and causing damage.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhat is a Mercury prop shaft seal kit, and when should it be replaced?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe Mercury prop shaft seal kit is a set of components designed to prevent water from entering the gearcase through the propeller shaft. It should be replaced if there is any evidence of water intrusion into the gearcase or if the propeller shaft seal shows signs of wear or damage.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhat is prop shaft end play, and how does Mercury prop shaft end play affect my outboard engine?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eProp shaft end play refers to the amount of axial movement that is present in the propeller shaft. Excessive end play can cause vibration, noise, and premature wear of the propeller shaft bearings. It is important to check and adjust prop shaft end play regularly to ensure proper operation and prevent damage to your Mercury outboard engine.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhat type of Mercury prop shaft grease should I use on my Mercury prop shaft?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eMercury recommends using a high-quality marine-grade grease that is formulated specifically for use in outboard engines. It is important to use a grease that is compatible with the materials used in the propeller shaft and propeller hub to ensure proper lubrication and prevent damage to the components.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow do I remove the prop shaft from my Mercury outboard engine?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eTo remove the prop shaft from a Mercury outboard engine, you will need a Mercury prop shaft removal tool. This tool is designed to fit over the end of the propeller shaft and apply force to remove it from the gearcase. It is important to follow the manufacturer's instructions for using the prop shaft removal tool to prevent damage to the propeller shaft or other components.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eWhat are the signs that I need to replace the prop shaft on my Mercury outboard engine?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eSigns that you may need to replace the prop shaft on your Mercury outboard engine include excessive end play, vibration or noise from the propeller shaft, or damage to the propeller shaft or propeller hub. It is important to inspect the propeller shaft regularly and address any issues promptly to prevent further damage to your engine.\u003c\/span\u003e\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow do I replace the prop shaft seal on my Mercury outboard engine?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eTo replace the prop shaft seal on your Mercury outboard engine, you will need to remove the propeller and the propeller shaft. Then, you can access the prop shaft seal and remove it using a seal puller tool. Once the old seal is removed, you can install the new seal using a seal installation tool. It is important to follow the manufacturer's instructions for replacing the prop shaft seal to ensure a proper seal and prevent water intrusion into the gearcase.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003ePartsVu stocks a wide selection of certified Mercury outboard lower unit assemblies, prop shafts and transmission components. Trips to the mechanic can get expensive. Choose from our inventory of Mercury outboard parts and perform your own outboard maintenance.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"pinion-stud-43-8m0113182","title":"PINION STUD - 43-8M0113182","description":"\u003cp\u003ePINION\/STUD                 ZZ\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626578305315,"sku":"43-8M0113182","price":19.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV744239.jpg?v=1698811749"},{"product_id":"mercury-link-thrtl-adjust-98886t01","title":"Mercury - Link-thrtl adjust - 98886T01","description":"\u003cp\u003eLink-thrtl adjust\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626597015843,"sku":"98886T01","price":4.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV700397.jpg?v=1698784455"},{"product_id":"mercury-lower-unit-assy-mhm39706t","title":"Mercury - 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Driveshaft - F695628-1","description":"\u003cp\u003eDriveshaft\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46933339603235,"sku":"F695628-1","price":151.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV530318.jpg?v=1698783655"},{"product_id":"mercury-bellows-f695130-4","title":"Mercury - Bellows - F695130-4","description":"\u003cp\u003eBellows\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46933340160291,"sku":"F695130-4","price":327.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV549030.jpg?v=1698783655"},{"product_id":"mercury-shift-plate-assy-99237a28","title":"Mercury - Shift plate assy - 99237A28","description":"\u003cp\u003eShift plate assy\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46933432795427,"sku":"99237A28","price":76.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV702114.jpg?v=1698784110"},{"product_id":"mercury-link-98887t","title":"Mercury - Link - 98887T","description":"\u003cp\u003eLink\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46933512716579,"sku":"98887T","price":5.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV698043.jpg?v=1698784448"},{"product_id":"mercury-transmission-8m8027395","title":"Mercury - Transmission - 8M8027395","description":"\u003cp\u003eTransmission\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935047504163,"sku":"8M8027395","price":20897.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV501630.jpg?v=1698791754"},{"product_id":"mercury-transmission-dl-8m8025307","title":"Mercury - Transmission - dl - 8M8025307","description":"\u003cp\u003eTransmission - dl\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935049535779,"sku":"8M8025307","price":25544.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV699350.jpg?v=1698791765"},{"product_id":"mercury-ps-trans-cooler-8m8025244","title":"Mercury - Ps\/trans cooler - 8M8025244","description":"\u003cp\u003ePs\/trans cooler\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935049797923,"sku":"8M8025244","price":1467.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV715125.jpg?v=1698791768"},{"product_id":"mercury-drive-plate-asy-8m8025228","title":"Mercury - Drive plate asy - 8M8025228","description":"\u003cp\u003eDrive plate asy\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935050453283,"sku":"8M8025228","price":2671.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV711920.jpg?v=1698791770"},{"product_id":"mercury-coupler-engine-8m6002667","title":"Mercury - Coupler-engine - 8M6002667","description":"\u003cp\u003eCoupler-engine\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935067885859,"sku":"8M6002667","price":2778.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV711865.jpg?v=1698791856"},{"product_id":"mercury-gerotor-assy-8m6001045","title":"Mercury - 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That steady, predictable movement brings a kind of quiet confidence you can’t fake. When your shifting system \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eis dialed\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e in, the whole ride feels smoother, whether you’re threading your way out of a busy marina or running wide across open water. The Quicksilver 8M0124413 Shift Actuator is one of those parts that keeps everything feeling tight and right, and you notice its value every single time you shift into gear.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePrecisely controls gear engagement in Mercury FourStroke and Verado outboards\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eHardcoat\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e anodized piston for increased corrosion resistance\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDurable aluminum cover designed for long-term reliability\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngineered to the same standards as the original Mercury Marine part\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesigned for consistent, smooth actuation under changing loads and conditions\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Mercury 135, 150, and 175 horsepower FourStroke outboards (serial 1B227000–1B517158)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Mercury 200 and 225 horsepower DFI (3.0 liter, Digital Throttle and Shift) models (serial 0T980000–1B964735)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Mercury 200, 225, 250, and 275 horsepower FourStroke Verado outboards (serial 0T980000–2B144122)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Mercury 200, 250, and 300 horsepower Verado outboards (FourStroke, six cylinder, serial 2B144123–2B578935)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCommon on center consoles, bay boats, pontoons, sport cruisers, and offshore fishing vessels\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e You’ll feel the difference the first time you shift after installing this actuator. The movement is crisp, controlled, and steady, giving you a direct connection between the throttle and the engine. There’s no hesitation, no loose or wandering sensation — just smooth, confident transitions as the gears settle into place. That kind of precision matters when you’re docking in a tight slip or working through a crowded inlet on a windy afternoon.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIts hardcoat anodized piston resists the kind of corrosion that slowly eats away at lesser components, especially in saltwater environments. The aluminum cover holds strong season after season, even with heavy use. And because \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eit’s built\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e to Mercury’s exact specifications, the fit feels natural — no forcing, no adjustments that leave you second-guessing. Just clean installation and dependable operation \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ethe\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e way \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eit’s meant\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e to be.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e When you’re dealing with shifting components, shortcuts rarely pay off. A genuine Mercury Marine part like this one gives you the peace of mind that it will fit correctly and work the way the engine expects. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAftermarket parts may look similar, but \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ethe\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e internal tolerances and coatings vary, \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eand that\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e can make a huge difference when every shift counts.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e This part number exists for a reason — to match Mercury’s system perfectly, provide long-term reliability, and save you the cost and trouble of premature replacements. If you want a part that lasts, this is the route seasoned boaters trust.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which Mercury engines does the Quicksilver 8M0124413 Shift Actuator fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It fits a wide range of Mercury FourStroke and Verado models from 135 to 300 horsepower within the listed serial ranges.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What sets this apart from aftermarket options?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIt’s built\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e to Mercury Marine’s original specifications, so the shifting feel, durability, and long-term performance match the factory standard.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How can I confirm this is the correct replacement?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Match your engine’s horsepower and serial number range to the compatibility list above. If it aligns, this is the right Mercury Marine part.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can it be used in both freshwater and saltwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes. The \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ehardcoat\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e anodized piston and aluminum construction hold up well in either environment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation manageable for most boat owners?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMost mechanically \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecomfortable\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e boaters can install it, but many prefer \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ehaving\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e a technician handle shifting components for optimal alignment.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935241425187,"sku":"8M0124413","price":1781.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8M0124413_Main.jpg?v=1760631356"},{"product_id":"mercury-exh-coupler-assy-8m0123001","title":"Mercury - Exh coupler assy - 8M0123001","description":"\u003cp\u003eExh coupler assy\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935246176547,"sku":"8M0123001","price":331.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV715975.jpg?v=1698792609"},{"product_id":"mercury-cam-rod-kit-short-8m0123272","title":"Mercury - Cam rod kit short - 8M0123272","description":"\u003cp\u003eCam rod kit short\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935246438691,"sku":"8M0123272","price":16.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV709223.jpg?v=1698792608"},{"product_id":"mercury-link-rod-8m0121496","title":"Mercury - Link rod - 8M0121496","description":"\u003cp\u003eLink rod\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935247290659,"sku":"8M0121496","price":51.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV720289.jpg?v=1698792613"},{"product_id":"mercury-coupler-straight-8m0120343","title":"Mercury - 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Bell housing kit - 8M0119239","description":"\u003cp\u003eBell housing kit\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935250272547,"sku":"8M0119239","price":547.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV715227.jpg?v=1698792627"},{"product_id":"mercury-bell-hsg-assy-8m0119240","title":"Mercury - Bell hsg. assy. - 8M0119240","description":"\u003cp\u003eBell hsg. assy.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935250665763,"sku":"8M0119240","price":541.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV718255.jpg?v=1698792629"},{"product_id":"mercury-shift-shaft-ll-8m0118190","title":"Mercury - Shift shaft ll - 8M0118190","description":"\u003cp\u003eShift shaft ll\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935252664611,"sku":"8M0118190","price":84.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV719034.jpg?v=1698792638"},{"product_id":"mercury-threaded-insert-8m0112321","title":"Mercury - 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