{"product_id":"oil-seal-fits-johnson-evinrude-omc-9-9-15-hp-replaces-321481-0321481","title":"Oil Seal – Fits Johnson\/Evinrude\/OMC 9.9-15 HP (Replaces 321481, 0321481)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis high-quality \u003cstrong\u003eOil Seal – Fits Johnson\/Evinrude\/OMC 9.9-15 HP (Replaces 321481, 0321481)\u003c\/strong\u003e is engineered for a precise fit on a range of Johnson and Evinrude outboard motors. It is primarily designed for 9.9 HP and 15 HP models from 1974–1975, and also fits some 40 HP applications from the same years.\u003c\/p\u003e\n\u003cp\u003eThis component serves as a direct cross-reference for several OEM and aftermarket part numbers, including Sierra 18-2029, GLM 86180, and OMC\/BRP 777525, ensuring broad compatibility and a reliable seal.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstalls on the propeller shaft within the lower gearcase bearing housing.\u003c\/li\u003e\n\u003cli\u003eEngineered to prevent gear lube leaks and water intrusion into the gearcase.\u003c\/li\u003e\n\u003cli\u003eIncludes one high-grade oil seal per package.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Interchange\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC \/ BRP\u003c\/td\u003e\n\u003ctd\u003e321481 \/ 0321481 \/ 777525\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-2029\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e86180\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory Marine\u003c\/td\u003e\n\u003ctd\u003e9-76218\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSEI Marine\u003c\/td\u003e\n\u003ctd\u003e94-361-01\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarr Marine\u003c\/td\u003e\n\u003ctd\u003eOMC47-321481\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e10E74G, 10E74S, 10EL74G, 10ELT4S, 10R74G, 10R74S, 10RL74G, 10RL74S\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e1974\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e10E75C, 10EL75C, 10R75C, 10RL75C\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e1975\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e15E74G, 15E74S, 15EL74G, 15EL74S, 15R74G, 15R74S, 15RL74G, 15RL74S\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e1974\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e15E75C, 15EL75C, 15R75C, 15RL75C\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e1975\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e40E74S, 40EL74S, 40R74S, 40RL74S\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e1974\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e40E75C, 40EL75C, 40R75C, 40RL75C\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e1975\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e10424G, 10424S, 10425G, 10425S, 10454G, 10454S, 10455G, 10455S\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e1974\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e10524C, 10525C, 10554C, 10555C\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e1975\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e15404G, 15404S, 15405G, 15405S, 15454G, 15454S, 15455G, 15455S\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e1974\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e15504C, 15505C, 15554C, 15555C\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e1975\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e40404S, 40405S, 40454S, 40455S\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e1974\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e40504C, 40505C, 40554C, 40555C\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e1975\u003c\/td\u003e\n\u003ctd\u003e321481\/0321481\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eOil Seal \/ Shaft Seal\u003c\/dd\u003e\n  \u003cdt\u003eInstallation Location\u003c\/dt\u003e\n\u003cdd\u003eLower Gearcase \/ Bearing Housing to Propeller Shaft\u003c\/dd\u003e\n  \u003cdt\u003eInside Diameter\u003c\/dt\u003e\n\u003cdd\u003e0.687 in. (17.45 mm)\u003c\/dd\u003e\n  \u003cdt\u003eOutside Diameter\u003c\/dt\u003e\n\u003cdd\u003e1.250 in. (31.75 mm)\u003c\/dd\u003e\n  \u003cdt\u003eHeight\/Width\u003c\/dt\u003e\n\u003cdd\u003e0.250 in. (6.35 mm)\u003c\/dd\u003e\n  \u003cdt\u003eCompatible Shaft Size\u003c\/dt\u003e\n\u003cdd\u003e0.687 in.\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.02 lbs (0.009 kg)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e Oil Seal (Replaces OMC 321481 \/ 0321481)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDrain the lower unit gear lube completely into a suitable container.\u003c\/li\u003e\n  \u003cli\u003eRemove the propeller, thrust washer, and any related hardware.\u003c\/li\u003e\n  \u003cli\u003eUnbolt and carefully extract the bearing housing carrier from the gearcase.\u003c\/li\u003e\n  \u003cli\u003ePry out the old oil seal from the housing, taking care not to scratch the housing bore. Note the orientation of the seal before removal.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean the seal bore in the housing to remove any old sealant or corrosion.\u003c\/li\u003e\n  \u003cli\u003eLubricate the outer diameter of the new seal with a thin film of sealant or grease.\u003c\/li\u003e\n  \u003cli\u003eUsing a seal driver or socket that matches the seal's outer diameter, press the new seal in squarely until it is fully seated.\u003c\/li\u003e\n  \u003cli\u003eLightly grease the inner lip of the new seal to prevent damage on initial startup.\u003c\/li\u003e\n  \u003cli\u003eReinstall the bearing housing into the gearcase, torquing fasteners to the manufacturer’s specifications.\u003c\/li\u003e\n  \u003cli\u003eReinstall the propeller and refill the lower unit with the correct gear lube.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if this seal is the right one for my engine?\u003c\/summary\u003e\u003cp\u003eThe best way to confirm fitment is to match your original part number to the ones listed in our Part Number Matrix. You should also verify that your engine's model and year are included in the Engine \u0026amp; Model Compatibility table. Visually comparing the dimensions (I.D., O.D., Width) with your old seal is a recommended final check.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failed propeller shaft seal?\u003c\/summary\u003e\u003cp\u003eThe most common symptom is milky, gray, or creamy-looking gear lube when you drain it, which indicates water has contaminated the oil. You may also notice gear lube leaking out from around the propeller area or a recurring need to top off the gearcase oil.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I replace this seal myself?\u003c\/summary\u003e\u003cp\u003eThis task is manageable for those with mechanical experience and the right tools, such as a seal puller and driver set. However, due to the need for precise installation to prevent leaks, we recommend professional installation if you are not fully comfortable with the process.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should this seal be replaced?\u003c\/summary\u003e\u003cp\u003eIt's good practice to inspect the seals whenever you service the lower unit or change the propeller. We recommend replacing them as a preventative measure every few seasons, or immediately if you see any signs of gear lube leakage or water intrusion.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShould I replace any other seals at the same time?\u003c\/summary\u003e\u003cp\u003eYes. When the lower unit is disassembled to this extent, it is highly recommended to also replace the other seals in the bearing carrier and any driveshaft or shift shaft seals that are accessible. This ensures a comprehensive and long-lasting repair.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs there a 'break-in' period for a new seal?\u003c\/summary\u003e\u003cp\u003eThere is no formal break-in period required. However, after installation, it's wise to run the engine briefly (in water) and then re-check for any signs of leakage around the propeller shaft to ensure the seal is seated and functioning correctly.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003eManufacturer-Direct Value — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718273372475,"sku":"3826","price":11.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/3826.png?v=1762958806","url":"https:\/\/seasierra.com\/products\/oil-seal-fits-johnson-evinrude-omc-9-9-15-hp-replaces-321481-0321481","provider":"SeaSierra","version":"1.0","type":"link"}