{"product_id":"merc-45","title":"Mercury Gearcase Driveshaft Oil Seal 26-413651","description":"\u003ch2\u003eMercury Gearcase Driveshaft Oil Seal 26-413651\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 26-413651 (short ref: 413651)\u003cbr\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury \/ Quicksilver\u003cbr\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Gearcase Driveshaft Oil Seal (OEM)\u003cbr\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Outboard Lower Unit \/ Gearcase\u003cbr\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Driveshaft \/ water-pump base area\u003cbr\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e 41365 \/ 26-41365\u003cbr\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 2 per assembly\u003cbr\u003e\n\u003cstrong\u003eGTIN \/ UPC:\u003c\/strong\u003e 745061144828\u003cbr\u003e\n\u003cstrong\u003eApproximate Weight:\u003c\/strong\u003e 15 g each \/ ~30 g per pair\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhat This Part Does\u003c\/h3\u003e\n\u003cp\u003eThe 26-413651 is a genuine OEM oil seal that sits beneath the water-pump base in the gearcase of selected small Mercury outboard engines. Two seals are used per assembly, stacked at the driveshaft location to seal gearcase lubricant away from the water-pump cavity. Correct quantity and installation orientation are both critical during service.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cp\u003eConfirm your engine horsepower, serial number, gearcase design, and driveshaft housing diagram before ordering. Mercury used multiple lower-unit designs within the same horsepower ranges — do not select this seal by appearance alone.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMercury 6 HP outboard\u003c\/li\u003e\n\u003cli\u003eMercury 8 HP outboard\u003c\/li\u003e\n\u003cli\u003eMercury 9.9 HP outboard\u003c\/li\u003e\n\u003cli\u003eMercury XR10\u003c\/li\u003e\n\u003cli\u003eMercury 10 MAGNUM\u003c\/li\u003e\n\u003cli\u003eMercury 10 MARATHON\u003c\/li\u003e\n\u003cli\u003eMercury 10 SEA PRO\u003c\/li\u003e\n\u003cli\u003eMercury 15 HP outboard\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eMercury references show 41365 \/ 413651 across multiple serial ranges within these engine families. Always verify by serial number and gear-housing diagram.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eSerial Number Notice\u003c\/h3\u003e\n\u003cp\u003eSeveral oil seals and water-tube seals are used in the same lower-unit assembly — do not order by physical appearance or size alone. Match by part number and confirm against the gearcase diagram for your specific engine serial number.\u003c\/p\u003e\n\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGearcase oil shows signs of water contamination (milky or foamy appearance)\u003c\/li\u003e\n\u003cli\u003eOil leakage visible around the driveshaft or water-pump base area\u003c\/li\u003e\n\u003cli\u003eSeal lip is worn, hardened, cracked, or damaged on inspection\u003c\/li\u003e\n\u003cli\u003eWater-pump base is removed during lower-unit service (replace as a matter of course)\u003c\/li\u003e\n\u003cli\u003eDriveshaft sealing surface shows evidence of leakage or seal wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity: 2 seals required per assembly\u003c\/strong\u003e — always replace both at the same time\u003c\/li\u003e\n\u003cli\u003eInstall both seals in the correct orientation per the Mercury service manual for your engine\u003c\/li\u003e\n\u003cli\u003eWhile the assembly is apart, inspect the water-pump base, driveshaft sealing surface, water-pump base gasket, quad ring, and water-tube seal\u003c\/li\u003e\n\u003cli\u003eInspect the \u003ca href=\"\/products\/8131398008868\"\u003ewater-pump base gasket\u003c\/a\u003e and related sealing components before reassembly\u003c\/li\u003e\n\u003cli\u003eRecheck gearcase oil level after reassembly and run the engine to confirm no leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePart Number Cross-Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent OEM:\u003c\/strong\u003e 26-413651\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShort Reference:\u003c\/strong\u003e 413651\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e 41365 \/ 26-41365\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAftermarket cross-reference:\u003c\/strong\u003e Sierra 18-0581 (third-party reference only)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e Order 26-413651 whenever the water-pump base is coming off a 6–15 HP Mercury outboard lower unit — it’s a low-cost seal that’s already exposed at that point. Replacing both seals during any lower-unit service is strongly recommended, since the second seal is in the same location and requires the same disassembly to reach.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon issues:\u003c\/strong\u003e The most frequent mistake is ordering only one seal when two are required at this location. A second common issue is confusing this driveshaft oil seal with the water-tube seal or other seals in the same lower-unit assembly — always match by part number, not by appearance or general seal size.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131398008868\"\u003eMercury Quicksilver 192043 Water Pump Base Gasket — 6–15 HP Outboard\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131397976100\"\u003eMercury Quicksilver 19202001 Water Pump Plate Gasket — 6 \/ 8 \/ 9.9 HP Outboard\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131406463012\"\u003eMercury Mariner Lower Unit Gear Housing Seal Kit 26-43035A4\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131406430244\"\u003eMercury Mariner Upper Driveshaft Oil Seal 26-43035\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131406495780\"\u003eMercury Mariner Driveshaft Lower Unit Oil Seal 26-43036\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131404726308\"\u003eMercury Water Pump Base to Face Plate Gasket 27-39625\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131441983524\"\u003eMercury Outboard Water Pump Impeller 8-Blade 8M0135803\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":51324679815204,"sku":"413651","price":16.47,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/6657a850-eac3-4b51-b914-07df9158cdf3.png?v=1788661182","url":"https:\/\/marisolmarine.com\/products\/merc-45","provider":"Marisol Marine Company","version":"1.0","type":"link"}