{"product_id":"mercury-22-8m0083059-fill-and-drain-screw-kit-fits-mercury-mariner-outboards-of-japanese-origin-w-8x1-25-metric-thread","title":"Mercury – Fill \u0026 Drain Screw Kit | Gearcase Service Hardware | 22-8M0083059","description":"\u003cp data-start=\"3604\" data-end=\"3683\"\u003e\u003cstrong data-start=\"3604\" data-end=\"3683\"\u003eMercury – Fill \u0026amp; Drain Screw Kit | Gearcase Service Hardware | 22-8M0083059\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"3685\" data-end=\"3688\"\u003e\n\u003ch3 data-start=\"3690\" data-end=\"3708\"\u003e\u003cstrong data-start=\"3694\" data-end=\"3706\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"3709\" data-end=\"4311\"\u003eThis fill and drain screw kit replaces the hardware used to open and close the lower-unit gear-lube ports on many Mercury and MerCruiser gearcases. These small screws deal with repeated removal, exposure to heat, saltwater, and vibration, so over time they can round off, lose their sealing ability, or develop corrosion that affects how the gearcase holds pressure. Replacing them as a set keeps the drains sealing properly and prevents slow leaks that can lead to water intrusion—a major cause of gear-lube breakdown. It’s a simple kit, but it plays an important part in keeping the gearcase healthy.\u003c\/p\u003e\n\u003chr data-start=\"3685\" data-end=\"3688\"\u003e\n\u003ch3 data-start=\"4313\" data-end=\"4335\"\u003e\u003cstrong data-start=\"4317\" data-end=\"4333\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"4336\" data-end=\"4674\"\u003e• \u003cstrong data-start=\"4338\" data-end=\"4362\"\u003eOEM Mercury Hardware\u003c\/strong\u003e – Correct thread fit for Mercury gearcase ports.\u003cbr data-start=\"4411\" data-end=\"4414\"\u003e• \u003cstrong data-start=\"4416\" data-end=\"4444\"\u003eIncludes Sealing Washers\u003c\/strong\u003e – Ensures clean, reliable sealing after each oil change.\u003cbr data-start=\"4501\" data-end=\"4504\"\u003e• \u003cstrong data-start=\"4506\" data-end=\"4536\"\u003eCorrosion-Resistant Finish\u003c\/strong\u003e – Built for long-term saltwater and freshwater use.\u003cbr data-start=\"4588\" data-end=\"4591\"\u003e• \u003cstrong data-start=\"4593\" data-end=\"4619\"\u003eDirect Replacement Kit\u003c\/strong\u003e – Straight swap for worn or damaged fill\/drain screws.\u003c\/p\u003e\n\u003chr data-end=\"3688\" data-start=\"3685\"\u003e\n\u003ch3 data-start=\"4676\" data-end=\"4713\"\u003e\u003cstrong data-start=\"4680\" data-end=\"4711\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"4714\" data-end=\"4838\"\u003e• Mercury outboard gearcases\u003cbr data-start=\"4742\" data-end=\"4745\"\u003e• MerCruiser sterndrives\u003cbr data-start=\"4769\" data-end=\"4772\"\u003e• Standard drain and fill ports\u003cbr data-start=\"4803\" data-end=\"4806\"\u003e• Mercury gearcase service group\u003c\/p\u003e\n\u003chr data-end=\"3688\" data-start=\"3685\"\u003e\n\u003ch3 data-start=\"4840\" data-end=\"4882\"\u003e\u003cstrong data-start=\"4844\" data-end=\"4880\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"4883\" data-end=\"5335\"\u003eFresh screws and sealing washers help the gearcase maintain proper pressure and keep water out—a critical part of protecting the gears and bearings. When screws get worn, they often leak just enough to allow moisture to mix with the oil. That leads to milky gear lube and heavier wear throughout the gearset. Installing new hardware ensures the ports seal cleanly after each service and reduces the chance of rounding out the screw head during removal.\u003c\/p\u003e\n\u003chr data-end=\"3688\" data-start=\"3685\"\u003e\n\u003ch3 data-start=\"5337\" data-end=\"5358\"\u003e\u003cstrong data-start=\"5341\" data-end=\"5356\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"5359\" data-end=\"5664\"\u003eThese screws match Mercury’s thread cut and sealing depth exactly. Universal replacements often fit loosely or don’t line up with the sealing surface correctly, which can lead to slow seepage. OEM screws also use corrosion-resistant material that stands up to repeated gear-lube changes without degrading.\u003c\/p\u003e\n\u003chr data-end=\"3688\" data-start=\"3685\"\u003e\n\u003ch3 data-start=\"5666\" data-end=\"5679\"\u003e\u003cstrong data-start=\"5670\" data-end=\"5677\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"5680\" data-end=\"5814\"\u003e\u003cstrong data-start=\"5680\" data-end=\"5737\"\u003e1. What are common signs these screws need replacing?\u003c\/strong\u003e\u003cbr data-start=\"5737\" data-end=\"5740\"\u003eRounded heads, rust, or leaks around the washers after a gear-lube change.\u003c\/p\u003e\n\u003cp data-start=\"5816\" data-end=\"5943\"\u003e\u003cstrong data-start=\"5816\" data-end=\"5861\"\u003e2. Should I replace both screws together?\u003c\/strong\u003e\u003cbr data-start=\"5861\" data-end=\"5864\"\u003eYes. Both are exposed to the same conditions and tend to wear at similar rates.\u003c\/p\u003e\n\u003cp data-start=\"5945\" data-end=\"6060\"\u003e\u003cstrong data-start=\"5945\" data-end=\"5988\"\u003e3. Are new washers required every time?\u003c\/strong\u003e\u003cbr data-start=\"5988\" data-end=\"5991\"\u003eIt’s strongly recommended; washers compress and lose sealing ability.\u003c\/p\u003e\n\u003cp data-start=\"6062\" data-end=\"6172\"\u003e\u003cstrong data-start=\"6062\" data-end=\"6105\"\u003e4. Can I install them with basic tools?\u003c\/strong\u003e\u003cbr data-start=\"6105\" data-end=\"6108\"\u003eYes—standard screwdrivers or hex drivers depending on the model.\u003c\/p\u003e\n\u003cp data-start=\"6174\" data-end=\"6294\"\u003e\u003cstrong data-start=\"6174\" data-end=\"6220\"\u003e5. Will this improve gearcase reliability?\u003c\/strong\u003e\u003cbr data-start=\"6220\" data-end=\"6223\"\u003eYes, by helping prevent water intrusion and maintaining proper sealing.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46941074391331,"sku":"22-8M0083059","price":10.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8m0083059_main.jpg?v=1760631358","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-22-8m0083059-fill-and-drain-screw-kit-fits-mercury-mariner-outboards-of-japanese-origin-w-8x1-25-metric-thread","provider":"PartsVu","version":"1.0","type":"link"}