{"title":"Outboard Engine Gaskets, Seals, Grommets \u0026 O-Rings","description":"\u003ch2\u003eBoat Motor Gaskets, Seals, Grommets, and O-Rings Resources and Information\u003c\/h2\u003e \u003cp\u003eGaskets, seals, grommets, and o-rings are necessary for performing periodic service and repairs on your outboard engine. PartsVu offers a complete selection of these essential components from top boating product suppliers, including Sierra and Coghlans. Need help servicing your outboard engine? PartsVu also occasionally publishes helpful resources like the following: \u003c\/p\u003e \u003cul\u003e \u003cli aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/pages\/yamaha-maintenance-schedule\"\u003e Outboard Service Schedule\u003c\/a\u003e\u003c\/li\u003e \u003cli aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/pages\/yamaha-engine-specifications-and-capacities-chart\"\u003e Outboard Specs \u0026amp; Capacities Chart\u003c\/a\u003e\u003c\/li\u003e \u003cli aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/pages\/mercury-maintenance-schedule\"\u003eMercury Outboard Service Schedule\u003c\/a\u003e\u003c\/li\u003e \u003cli aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/pages\/mercury-outboard-engine-oil-capacities-and-oil-filter-chart\"\u003eMercury Outboard Specs \u0026amp; Capacities Chart\u003c\/a\u003e\u003c\/li\u003e \u003cli aria-level=\"1\"\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/mercury-mercruiser-inboard-engine-care-maintenance\"\u003eMerCruiser Inboard Maintenance\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eLooking for more marine products for your boat and outboard engine? Browse PartsVu’s \u003ca href=\"https:\/\/partsvu.com\/collections\/vu-products\"\u003eproducts and accessories\u003c\/a\u003e or \u003ca href=\"https:\/\/partsvu.com\/collections\/aftermarket-engine-parts\"\u003eaftermarket engine parts\u003c\/a\u003e.\u003c\/p\u003e \u003ch2\u003e\u003cstrong\u003eOutboard Engine Gaskets, Seals, Grommets, and O-Rings FAQs\u003c\/strong\u003e\u003c\/h2\u003e \u003ch3\u003e\u003cstrong\u003eWhat is an outboard motor gasket?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003eYour\u003ca href=\"https:\/\/partsvu.com\/collections\/yamaha-marine-gaskets-seals-o-rings-and-grommets?amp%3Bitm_campaign=yamaha-gaskets-seals-o-rings-and-grommets\u0026amp;amp%3Bitm_medium=in-text\u0026amp;itm_source=blog-does-your-yamaha-outboard-head-gasket-need-to-be-repaired\"\u003e outboard head gasket\u003c\/a\u003e is a very important component in the performance and lifespan of your engine. Located between the cylinder head (where your spark plugs are screwed in) and the cylinder block, a head gasket is responsible for sealing these components together to withstand the compression from the engine and enable cooling water to flow between the block and the head.\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eDoes my outboard head gasket need to be repaired?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003eTo ensure your outboard performs its best and to extend its lifespan, preventative maintenance should always be a top priority. recommends a number of regular maintenance intervals for your outboard based on its usage – 20 hours for a new engine, every 100 hours or annually, and enhanced service at 300 hours and 500 hours.\u003c\/p\u003e \u003cp\u003eHowever, one common benchmark for outboard head gasket replacement many boaters miss is replacing it every four (4) years. Depending on your usage, this timeframe may be shortened but four years is generally regarded as a “must” to change your head gasket before other problems develop.\u003c\/p\u003e \u003cp\u003eThere may be no visible signs of head gasket damage by this time, but this repair will give you peace of mind – plus, when you’re changing the head gasket, you can perform other inspections and replacements (such as\u003ca href=\"https:\/\/partsvu.com\/?amp%3Bitm_campaign=yamaha-anodes\u0026amp;amp%3Bitm_medium=in-text\u0026amp;amp%3Bitm_source=blog-does-your-yamaha-outboard-head-gasket-need-to-be-repaired\u0026amp;q=yamaha%20anode\"\u003e anodes\u003c\/a\u003e, engine bores, salt\/sand buildup,\u003ca href=\"https:\/\/partsvu.com\/?amp%3Bitm_campaign=yamaha-spark-plugs\u0026amp;amp%3Bitm_medium=in-text\u0026amp;amp%3Bitm_source=blog-does-your-yamaha-outboard-head-gasket-need-to-be-repaired\u0026amp;q=yamaha%20spark%20plugs\"\u003e spark plugs\u003c\/a\u003e).\u003c\/p\u003e \u003cp\u003eAnother common sign that your\u003ca href=\"https:\/\/partsvu.com\/collections\/yamaha-marine-gaskets-seals-o-rings-and-grommets?amp%3Bitm_campaign=yamaha-gaskets-seals-o-rings-and-grommets\u0026amp;amp%3Bitm_medium=in-text\u0026amp;itm_source=blog-does-your-yamaha-outboard-head-gasket-need-to-be-repaired\"\u003e outboard head gasket\u003c\/a\u003e is in need of repair is low pressure in the cylinders. This requires a simple compression test on each cylinder, which involves removing each\u003ca href=\"https:\/\/partsvu.com\/?amp%3Bitm_campaign=yamaha-spark-plugs\u0026amp;amp%3Bitm_medium=in-text\u0026amp;amp%3Bitm_source=blog-does-your-yamaha-outboard-head-gasket-need-to-be-repaired\u0026amp;q=yamaha%20spark%20plugs\"\u003e spark plug\u003c\/a\u003e,\u003ca href=\"https:\/\/partsvu.com\/?amp%3Bitm_campaign=compression-gauge\u0026amp;amp%3Bitm_medium=in-text\u0026amp;amp%3Bitm_source=blog-does-your-yamaha-outboard-head-gasket-need-to-be-repaired\u0026amp;q=compression%20gauge\"\u003e plugging in a compression gauge\u003c\/a\u003e, and cranking your engine without giving it throttle.\u003c\/p\u003e \u003cp\u003eWhat you’ll be looking for as you test each cylinder is near-identical readings between cylinders. If there’s more than 10% variance between each cylinder, it’s likely that the head gasket is the culprit.\u003c\/p\u003e \u003cp\u003eIf you notice black specks, a blackish crud, or a grey slime in the cylinder, it’s more than likely that a leaking head gasket is to blame. The reason for these substances is that combustion byproducts build up in the combustion chamber during combustion. These byproducts then either flake off (specks), build up inside the cylinder (crud), or mix with water from the adjacent cooling chamber (slime).\u003c\/p\u003e \u003cp\u003eWhen idling, especially at low RPMs, you may notice that your engine runs too slow – almost to the point of completely dying. Or, it may provide a rough idle that’s not consistent, causing a jarring motion.\u003c\/p\u003e \u003cp\u003eThe reason for these events is that the spark plugs cannot create a consistent spark due to water leakage on the spark plugs. If you remove the spark plugs and notice corrosion, then water is leaking in and diluting the fuel due to a faulty head gasket.\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eCan you replace a head gasket yourself?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003eYes, a head gasket repair is an easy job that only requires a few tools. Unlike a vehicle, where getting to the head gasket requires the removal of the engine and other components, an outboard is smaller and easy to access.\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eHow much does it cost to replace a head gasket on a boat?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003eIf you choose to replace your outboard head gasket yourself, you can only be on the hook for parts ($50 or less for many engine models) and tools (many of which you may already have in your toolbox).\u003c\/p\u003e \u003cp\u003eTaking your outboard to a mechanic will include the cost of parts, but also labor. Considering labor generally costs between $70 – $120 (or more!), the total cost of just a head gasket replacement can be a few hundred dollars. Of course, the advantage of a head gasket replacement by a mechanic is that they can make other replacements, trim the heads if they’re warped, and diagnose any other developing issues that may be plaguing your outboard.\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eIs a head gasket worth fixing?\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003eYes, a head gasket is a worthwhile investment that can prolong the life of your entire outboard motor. Better yet, you can learn an essential maintenance skill and expand your knowledge base, both of which will pay you dividends in the future.\u003c\/p\u003e \u003ch3\u003e \u003cstrong\u003eHow do I \u003c\/strong\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/mercury-4-stroke-100-hour-service-step-4-lower-unit\"\u003e\u003cstrong\u003eservice my 4-stroke outboard engine\u003c\/strong\u003e\u003c\/a\u003e\u003cstrong\u003e?\u003c\/strong\u003e \u003c\/h3\u003e \u003cp\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\/p\u003e \u003cp\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\/p\u003e \u003cp\u003eBegin pumping oil into the Mercury 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\/p\u003e \u003cp\u003eBefore you do get started on any maintenance projects, make sure to get the right parts (even for\u003ca href=\"https:\/\/partsvu.com\/collections\/mercruiser-parts\"\u003e Mercruiser engines\u003c\/a\u003e) so you don’t have to stop right in the middle.\u003c\/p\u003e \u003ch3\u003e \u003cstrong\u003eWhat is an \u003c\/strong\u003e\u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/proven-way-to-do-a-yamaha-outboard-leak-down-test\"\u003e\u003cstrong\u003eoutboard leak down\u003c\/strong\u003e\u003c\/a\u003e\u003cstrong\u003e test?\u003c\/strong\u003e \u003c\/h3\u003e \u003cp\u003eAn outboard leakdown test is a simple diagnostic checkup for your outboard – and it can even be incorporated into your regular maintenance intervals for peace of mind. \u003c\/p\u003e \u003cp\u003eDuring the test, you’ll be able to determine if there’s any loss in air pressure around your engine’s internal seals and passages. Even a pinhole leak can drastically alter your outboard’s performance, so performing a leak down test is important to determine whether the\u003ca href=\"https:\/\/partsvu.com\/collections\/yamaha-outboard-parts?amp%3Bitm_campaign=yamaha-outboard-parts\u0026amp;amp%3Bitm_medium=in-text\u0026amp;itm_source=blog-proven-way-to-do-a-yamaha-outboard-leak-down-test\"\u003e piston seals and other components\u003c\/a\u003e are in good shape. \u003c\/p\u003e \u003cp\u003eFortunately, a leak down test only requires a few common tools and some basic knowledge about your outboard. Even boaters with minimal experience can diagnose developing issues that affect the overall performance and lifespan of your boat’s engine(s). Best of all, performing this test will save you money and headaches down the road.\u003c\/p\u003e \u003cp\u003eA outboard leak down test indicates the condition of each of the engine’s cylinders and the overall condition of the motor. Similar to a compression test, it involves spraying compressed air into each cylinder and using a pressure gauge to measure a percentage of pressure that’s lost after a short period.\u003c\/p\u003e \u003cp\u003eAlso, part of doing a leakdown test on a motor is to listen for any signs of leakage. By listening closely to each cylinder and the areas around them, you’ll better understand where leaks may be present.\u003c\/p\u003e \u003cp\u003eThe goal of a pressure test is to confirm whether the motor has any air leaks. The presence or absence of air in engines often leads to leaking of fuel-air mixtures and leakage of fuel during operation. \u003c\/p\u003e \u003cp\u003eAdditionally, these leaks may become infiltration points for water and moisture from the aquatic environment, resulting in internal corrosion, sub-optimal performance (i.e., at idle, low RPMs, and high RPMs), and other issues.\u003c\/p\u003e \u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003ePartsVu is thrilled to offer a wide selection of gaskets, seals, grommets and O-rings to fit your outboard engine’s exact specifications. Browse these marine products from some of the most trusted suppliers in the boating industry, including Sierra and Coghlans.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"sierra-gasket-0808","title":"Sierra - Gasket - 0808","description":"\u003cp\u003eGASKET\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625888375075,"sku":"PV029750","price":9.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/47-0808_1.jpg?v=1698781809"},{"product_id":"sierra-gasket-omc-327707-2-0134","title":"Sierra - Gasket OMC 327707 (Sold Individually) - 0134","description":"\u003cp\u003eGasket OMC 327707 (Sold Individually)\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625888604451,"sku":"PV029477","price":3.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/47-0134_1.jpg?v=1698781823"},{"product_id":"sierra-gasket-carburetor-chrysler-27-828316-0314","title":"Sierra - Gasket Carburetor Chrysler 27-828316 - 0314","description":"\u003cp\u003eGasket Carburetor Chrysler 27-828316\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625888801059,"sku":"PV029531","price":6.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/47-0314_1.jpg?v=1698781818"},{"product_id":"sierra-merc-therm-gasket-27-850318-1-3675","title":"Sierra - Merc Therm Gasket 27-850318-1 - 3675","description":"\u003cp\u003eMerc Therm Gasket 27-850318-1\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625904333091,"sku":"PV760116","price":4.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/47-3675_1.jpg?v=1698781072"},{"product_id":"sierra-gasket-h-e-end-cap-27-99960-0389","title":"Sierra - GASKET H\/E END CAP 27-99960 - 0389","description":"\u003cp\u003eGASKET H\/E END CAP 27-99960\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625912426787,"sku":"PV029564","price":11.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV29564.jpg?v=1698781820"},{"product_id":"sierra-gasket-27-38501-1-0879","title":"Sierra - GASKET 27-38501-1 - 0879","description":"\u003cp\u003eGASKET  27-38501 1\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625916195107,"sku":"PV029778","price":10.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV29778.jpg?v=1698781810"},{"product_id":"sierra-gasket-fuel-pmp-yamaha-65024431a000-0849","title":"Sierra - Gasket Fuel Pmp Yamaha 65024431A000 - 0849","description":"\u003cp\u003eGasket Fuel Pmp Yamaha 65024431A000\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625917800739,"sku":"PV029762","price":2.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV29762.png?v=1698781812"},{"product_id":"sierra-27-41670006mc-gasket-0336","title":"Sierra - 27-41670006MC GASKET - 0336","description":"\u003cp\u003e27-41670006MC GASKET\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625921929507,"sku":"PV029542","price":15.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV29542.jpg?v=1698781818"},{"product_id":"sierra-329920-omc-water-jacket-gasket-2905","title":"Sierra - 329920 OMC Water Jacket Gasket - 2905","description":"\u003cp\u003e329920 OMC Water Jacket Gasket\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625934709027,"sku":"PV759665","price":3.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV759665.jpg?v=1698781084"},{"product_id":"sierra-gasket-ex-elbow-mp-283109-28491","title":"Sierra - Gasket-Ex Elbow Mp #283109 - 28491","description":"\u003cp\u003eGasket-Ex Elbow Mp #283109 @2\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625940115747,"sku":"PV759616","price":14.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV759616.jpg?v=1698781085"},{"product_id":"sierra-61a-11181-a0-yamaha-head-gasket-3891","title":"Sierra - 61A-11181-A0 Yamaha Head Gasket - 3891","description":"\u003cp\u003e61A-11181-A0 Yamaha Head Gasket\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625940705571,"sku":"PV760227","price":92.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV760227.jpg?v=1698781067"},{"product_id":"sierra-gasket-exhaust-manifold-gm-4-3l-2-2909","title":"Sierra - Gasket-Exhaust Manifold GM 4.3L (Sold Individually) - 2909","description":"\u003cp\u003eGasket-Exhaust Manifold GM 4.3L (Sold Individually)\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625944047907,"sku":"PV759669","price":10.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV759669.jpg?v=1698781083"},{"product_id":"sierra-gasket-head-johnson-evinrude-327674-3899","title":"Sierra - Gasket Head Johnson\/Evinrude 327674 - 3899","description":"\u003cp\u003eGasket Head Johnson\/Evinrude 327674\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625947423011,"sku":"PV760233","price":11.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV760233.jpg?v=1698781065"},{"product_id":"sierra-head-gasket-3894","title":"Sierra - Head Gasket - 3894","description":"\u003cp\u003eHead Gasket\u003c\/p\u003e","brand":"SIERRA","offers":[{"title":"Default Title","offer_id":45625950175523,"sku":"PV029422","price":60.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/47-3894_1.jpg?v=1698781828"},{"product_id":"sierra-gasket-elbow-mp-283135-0672","title":"Sierra - 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