{"product_id":"lower-unit-seal-kit-fits-johnson-evinrude-85-100-125-hp-replaces-18-2691","title":"Lower Unit Seal Kit – Fits Johnson\/Evinrude 85\/100\/125 HP (Replaces 18-2691)","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\u003csection\u003e\n    \u003ch2\u003eProduct Details\u003c\/h2\u003e\n    \u003cp\u003eThis \u003cstrong\u003eLower Unit Seal Kit – Fits Johnson\/Evinrude 85\/100\/125 HP Large Prop Shaft 1971-1972\u003c\/strong\u003e is an essential service part for maintaining the gearcase on specific 2-stroke Johnson and Evinrude 85, 100, and 125 HP engines from 1971–1972. It provides all the necessary seals and gaskets to prevent water intrusion and oil leaks, ensuring the longevity and performance of your outboard's lower unit.\u003c\/p\u003e\n    \u003cp\u003eThis kit serves as a direct replacement for Sierra 18-2691, GLM 87611, and Mallory 9-74114, offering a reliable and cost-effective alternative to OEM parts.\u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003eInstalls as a direct replacement for the original components.\u003c\/li\u003e\n        \u003cli\u003eSpecifically designed for models equipped with the large prop shaft.\u003c\/li\u003e\n        \u003cli\u003eIncludes all necessary seals, gaskets, and O-rings for a complete overhaul.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\u003c\/section\u003e\n\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 (OEM)\u003c\/td\u003e\n            \u003ctd\u003e433550\u003c\/td\u003e\n            \u003ctd\u003eOriginal Equipment Manufacturer Reference\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003eSierra\u003c\/td\u003e\n            \u003ctd\u003e18-2691\u003c\/td\u003e\n            \u003ctd\u003eAftermarket Equivalent\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003eGLM\u003c\/td\u003e\n            \u003ctd\u003e87611\u003c\/td\u003e\n            \u003ctd\u003eAftermarket Equivalent\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003eMallory\u003c\/td\u003e\n            \u003ctd\u003e9-74114\u003c\/td\u003e\n            \u003ctd\u003eAftermarket Equivalent\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n\u003c\/section\u003e\n\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 designed exclusively for the Johnson and Evinrude models listed, covering 85, 100, and 125 HP variants manufactured in 1971 and 1972 with the large prop shaft.\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\u003e85193A\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1971\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e85193H\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1971\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e85293R\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1972\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e85ESL71\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1971\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e85ESL72\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1972\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e100193A\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1971\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e100193C\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1971\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e100293\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1972\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e100ESL71\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1971\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e100ESL72\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1972\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e125183C\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1971\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e125283R\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1972\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e125ESL71\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1971\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e125ESL72\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1972\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003ctd\u003eLarge Prop Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n    \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n    \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n    \u003cdl\u003e\n        \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eLower Unit Seal Kit\u003c\/dd\u003e\n        \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement\u003c\/dd\u003e\n        \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eLarge prop shaft version\u003c\/dd\u003e\n    \u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n    \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003e1 x Solenoid Cover Gasket (Replaces 0314876, 0777572, 18-2874)\u003c\/li\u003e\n        \u003cli\u003e2 x Oil Seal (Replaces 0330137, 0310600, 0321463, and others)\u003c\/li\u003e\n        \u003cli\u003e2 x Oil Seal (Replaces 0321466, 0313337, 0318223, and others)\u003c\/li\u003e\n        \u003cli\u003e2 x Drain\/Fill Plug Washer (Replaces 0311598, 3852105, 18-4248)\u003c\/li\u003e\n        \u003cli\u003e4 x O-Ring Seal (Replaces 0317178, 0777520, 18-7109)\u003c\/li\u003e\n        \u003cli\u003e1 x O-Ring (Replaces 0313446, 0765593, 18-7127)\u003c\/li\u003e\n        \u003cli\u003e1 x O-Ring (Replaces 0354731, 0314728, 0777532, and others)\u003c\/li\u003e\n    \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n    \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n    \u003col\u003e\n        \u003cli\u003ePlace a drain pan under the lower unit and remove the upper and lower drain\/fill screws to empty the gear lube.\u003c\/li\u003e\n        \u003cli\u003eDisconnect the shift linkage and remove the bolts securing the lower unit to the engine. Carefully lower the gearcase.\u003c\/li\u003e\n        \u003cli\u003eRemove the propeller, bearing carrier, and driveshaft components to access the old seals. Note the orientation of each seal before removal.\u003c\/li\u003e\n        \u003cli\u003eThoroughly clean all sealing surfaces, ensuring they are free of old adhesive, corrosion, or debris.\u003c\/li\u003e\n        \u003cli\u003eInstall the new seals and O-rings from the kit, using a proper seal driver or appropriately sized socket. Ensure they are seated correctly and uniformly.\u003c\/li\u003e\n        \u003cli\u003eReassemble the driveshaft, bearing carrier, and propeller, torquing all fasteners to the manufacturer's specifications.\u003c\/li\u003e\n        \u003cli\u003eReinstall the lower unit, reconnect the shift linkage, and refill with fresh marine gear lubricant before testing.\u003c\/li\u003e\n    \u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n    \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eWhat are the signs of a failing lower unit seal?\u003c\/summary\u003e\n        \u003cp\u003eThe most common sign is \"milky\" or cloudy gear lube, which indicates water has mixed with the oil. You might also notice gear oil leaking from the propeller shaft area or around the drain plugs. A pressure test of the gearcase can definitively diagnose a leak.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eIs this kit compatible with other engine years or models?\u003c\/summary\u003e\n        \u003cp\u003eNo, this kit is specifically for the Johnson\/Evinrude 85, 100, and 125 HP models from 1971–1972 that use the large propeller shaft. Using it on other models will result in leaks and potential gearcase damage. Always verify your engine's model and year.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eHow can I confirm I have the \"large prop shaft\" version?\u003c\/summary\u003e\n        \u003cp\u003eThe most reliable method is to check your engine's model number against the compatibility list or your service manual. Visually comparing your old seals to the pictures and part numbers in this listing can also help, but checking the model number is definitive.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eHow often should I replace my lower unit seals?\u003c\/summary\u003e\n        \u003cp\u003eSeals should be inspected annually when you change your gear lube. It is recommended to replace them every 2-3 years as part of preventative maintenance, or immediately if you notice any signs of leaks or water intrusion.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eDo I need special tools for this installation?\u003c\/summary\u003e\n        \u003cp\u003eWhile basic hand tools are required, a seal puller and a proper seal driver set are highly recommended to prevent damage to the new seals or the gearcase housing during installation. A torque wrench is essential for correct reassembly.\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\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\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\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718257676603,"sku":"SS-24OSK706","price":33.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/SS-24OSK706.png?v=1762958227","url":"https:\/\/seasierra.com\/products\/lower-unit-seal-kit-fits-johnson-evinrude-85-100-125-hp-replaces-18-2691","provider":"SeaSierra","version":"1.0","type":"link"}