{"product_id":"lower-unit-seal-kit-fits-johnson-evinrude-35-75hp-replaces-0396355-0777562","title":"Lower Unit Seal Kit – Fits Johnson\/Evinrude 35-75HP (Replaces 0396355, 0777562)","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\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  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\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\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis \u003cstrong\u003eLower Unit Seal Kit – Fits Johnson\/Evinrude 35-75HP 1975–1988\u003c\/strong\u003e provides all necessary seals and gaskets to service the gearcase on Johnson\/Evinrude outboards. It is designed for 35-75HP, 2-cylinder and 3-cylinder models with the small gearcase manufactured between 1975 and 1988.\u003c\/p\u003e\n  \u003cp\u003eThis kit serves as a direct replacement for Sierra 18-2659, GLM 87603, Mallory 9-74102, WSM 446-102, and Johnson\/Evinrude OEM parts 0396355 and 0777562.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eEngineered with corrosion-resistant materials suitable for harsh marine environments.\u003c\/li\u003e\n    \u003cli\u003eIncludes drain\/fill plug washers and all required O-rings for a complete overhaul.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended to ensure a proper seal and long-term performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket suppliers.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003ePart Number\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\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eOEM\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e0777562\u003c\/td\u003e\n          \u003ctd\u003eOEM Superseded\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-2659\u003c\/td\u003e\n          \u003ctd\u003eAftermarket\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eGLM\u003c\/td\u003e\n          \u003ctd\u003e87603\u003c\/td\u003e\n          \u003ctd\u003eAftermarket\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMallory\u003c\/td\u003e\n          \u003ctd\u003e9-74102\u003c\/td\u003e\n          \u003ctd\u003eAftermarket\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eWSM\u003c\/td\u003e\n          \u003ctd\u003e446-102\u003c\/td\u003e\n          \u003ctd\u003eAftermarket\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n  \u003cp\u003eThis kit is specifically for Johnson\/Evinrude models with a small gearcase.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; 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\u003eStroke\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\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e2 Cyl 3.187 Bore Looper\u003c\/td\u003e\n          \u003ctd\u003e35\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1986–1987\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eSmall gearcase\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e2 Cyl 3.187 Bore Looper\u003c\/td\u003e\n          \u003ctd\u003e40\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1985–1988\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eSmall gearcase\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e2 Cyl 3.187 Bore Looper\u003c\/td\u003e\n          \u003ctd\u003e48\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1987–1988\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eSmall gearcase\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e2 Cyl 3.187 Bore Looper\u003c\/td\u003e\n          \u003ctd\u003e50\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1985–1988\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eSmall gearcase\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e2 Cyl 3.187 Bore Looper\u003c\/td\u003e\n          \u003ctd\u003e60\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1985\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eSmall gearcase\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e3 Cyl 3.000 Bore Looper\u003c\/td\u003e\n          \u003ctd\u003e60\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1986–1987\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eSmall gearcase\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e3 Cyl 3.000 Bore Looper\u003c\/td\u003e\n          \u003ctd\u003e70\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1985\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eSmall gearcase\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003e3 Cyl 3.000 Bore Looper\u003c\/td\u003e\n          \u003ctd\u003e75\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1985–1987\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eSmall gearcase\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n          \u003ctd\u003eVarious models\u003c\/td\u003e\n          \u003ctd\u003e35-75\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1975–1988\u003c\/td\u003e\n          \u003ctd\u003e0396355\u003c\/td\u003e\n          \u003ctd\u003eSmall gearcase\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eLower Unit\/Gearcase Seal Kit\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eProfessional installation recommended\u003c\/dd\u003e\n    \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.18 kg (0.4 lb)\u003c\/dd\u003e\n    \u003cdt\u003eThread Size\u003c\/dt\u003e\n\u003cdd\u003eVarious (includes drain\/fill plug washers)\u003c\/dd\u003e\n    \u003cdt\u003eOperating Temperature\u003c\/dt\u003e\n\u003cdd\u003eMarine environment standard\u003c\/dd\u003e\n    \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eVaries by manufacturer\u003c\/dd\u003e\n    \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eCorrosion-resistant materials for marine environments\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Impeller Housing Gasket (18-0969)\u003c\/li\u003e\n    \u003cli\u003e1 x Oil Seal (18-2059)\u003c\/li\u003e\n    \u003cli\u003e2 x Oil Seal (18-2060)\u003c\/li\u003e\n    \u003cli\u003e1 x Oil Seal (18-2064)\u003c\/li\u003e\n    \u003cli\u003e1 x Gearcase Cover Seal (18-2532)\u003c\/li\u003e\n    \u003cli\u003e1 x Exhaust Leg Seal (18-2537)\u003c\/li\u003e\n    \u003cli\u003e1 x Shift Housing Gasket (18-2855)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e Drain\/Fill Plug Washer (18-4248)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (18-7115)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (18-7120)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (18-7137)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (18-7140)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e O-Ring (18-7145)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e3 x\u003c\/span\u003e O-Ring (18-7475)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003ePosition the outboard securely on an engine stand or with the lower unit clear for access.\u003c\/li\u003e\n    \u003cli\u003ePlace a drain pan under the gearcase and remove the upper (vent) and lower (drain) screws to drain the gear oil.\u003c\/li\u003e\n    \u003cli\u003eDisconnect the shift linkage and remove the bolts securing the lower unit to the engine's exhaust housing.\u003c\/li\u003e\n    \u003cli\u003eCarefully lower and remove the gearcase assembly from the outboard.\u003c\/li\u003e\n    \u003cli\u003eDisassemble the gearcase components, including the water pump and bearing carrier, to access the old seals. Keep parts organized.\u003c\/li\u003e\n    \u003cli\u003eUse a seal puller or appropriate tool to carefully remove all old seals, gaskets, and O-rings.\u003c\/li\u003e\n    \u003cli\u003eThoroughly clean all sealing surfaces, ensuring they are free of old gasket material, corrosion, or debris.\u003c\/li\u003e\n    \u003cli\u003eInstall the new seals and O-rings from the kit, applying a light coat of marine grease to the lips of the seals.\u003c\/li\u003e\n    \u003cli\u003eReassemble the gearcase components in reverse order, ensuring correct alignment and torque specifications.\u003c\/li\u003e\n    \u003cli\u003eReinstall the lower unit, reconnect the shift linkage, and refill the gearcase with the manufacturer-specified lubricant until it flows from the vent hole.\u003c\/li\u003e\n    \u003cli\u003eInstall the vent and drain screws with the new washers provided in the kit. Securely tighten them.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know if this kit fits my engine?\u003c\/summary\u003e\n    \u003cp\u003eThis kit is designed for Johnson and Evinrude 35-75HP outboards from 1975–1988 with a small gearcase. The best way to confirm fitment is to check your engine's model and year against the compatibility table and cross-reference your existing part numbers with those listed in the Part Number Matrix.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the signs of a failing lower unit seal?\u003c\/summary\u003e\n    \u003cp\u003eThe most common signs are milky, white, or creamy gear oil (indicating water intrusion), visible oil leaks from the propeller shaft or driveshaft area, or a recurring low gear oil level. Any of these symptoms warrant an inspection and likely a reseal.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eA review mentioned fit issues with a 70HP Johnson model. Is this a known problem?\u003c\/summary\u003e\n    \u003cp\u003eWhile this kit is specified for a wide range of models, including 70HP variations, manufacturing tolerances on older engines can sometimes cause minor discrepancies. We have noted this feedback but have extensive verification showing compatibility. Always verify your engine's specific model and year, and check that it uses OEM part number 0396355, to ensure the best fit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should lower unit seals be replaced?\u003c\/summary\u003e\n    \u003cp\u003eThere is no fixed replacement interval, but it's good practice to inspect for leaks annually when changing the gear oil. Many owners perform a preventative reseal every 5-7 years, or immediately if any signs of water intrusion or oil leakage are found.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre all the necessary O-rings and gaskets for a full reseal included?\u003c\/summary\u003e\n    \u003cp\u003eYes, this kit is comprehensive and includes the primary driveshaft and propeller shaft seals, O-rings, gaskets, and drain screw washers needed for a standard lower unit service, as detailed in the \"What’s in the Box\" list.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n    \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\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\n    \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\n    \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\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\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\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723967271227,"sku":"SS-24OSK701","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/SS-24OSK701.png?v=1763038674","url":"https:\/\/seasierra.com\/products\/lower-unit-seal-kit-fits-johnson-evinrude-35-75hp-replaces-0396355-0777562","provider":"SeaSierra","version":"1.0","type":"link"}