{"product_id":"lower-unit-gearcase-seal-kit-fits-johnson-evinrude-40-50-hp-replaces-433550","title":"Lower Unit Gearcase Seal Kit – Fits Johnson\/Evinrude 40-50 HP (Replaces 433550)","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\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eLower Unit Gearcase Seal Kit\u003c\/strong\u003e is designed for Johnson\/Evinrude 2-cylinder 40 HP, 48 HP, and 50 HP 2-stroke outboard motors manufactured from 1989 to 2005. It also provides coverage for select 25 HP models with a 'D' suffix from 1990–1995.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Johnson\/Evinrude part numbers 433550 and 777551, as well as aftermarket equivalents including Sierra 18-2694, GLM 87614, Mallory 9-74104, and EMP 26-07400.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eDirect replacement for a hassle-free installation.\u003c\/li\u003e\n    \u003cli\u003eIncludes a complete set of seals, gaskets, and o-rings for a full gearcase service.\u003c\/li\u003e\n    \u003cli\u003eEngineered for use in standard gasoline outboard environments.\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 Matrix\"\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\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e433550\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e777551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-2694\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e87614\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-74104\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEMP\u003c\/td\u003e\n\u003ctd\u003e26-07400\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJLM Marine\u003c\/td\u003e\n\u003ctd\u003e433550\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\u003cp\u003eThis kit fits a range of Johnson\/Evinrude 2-stroke outboards. Please verify your specific model and year before ordering.\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\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e25 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1990–1995\u003c\/td\u003e\n        \u003ctd\u003e433550\u003c\/td\u003e\n        \u003ctd\u003eD suffix only; compatibility reported by some retailers\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e40 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1989–2005\u003c\/td\u003e\n        \u003ctd\u003e433550\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e48 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1989–1996\u003c\/td\u003e\n        \u003ctd\u003e433550\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e50 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1989–2005\u003c\/td\u003e\n        \u003ctd\u003e433550\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\u003eLower Unit Gearcase Seal Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eGasoline\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.14 kg (0.31 lb)\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 Year (JLM Marine), 30 days (Southcentral Outboards)\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eComplete kit for Johnson\/Evinrude 2-cylinder 40-50 HP gearcase service\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e1 x Complete Lower Unit Seal Kit, which includes:\n        \u003cul\u003e\n            \u003cli\u003e1 x Magnetic Drain Screw \u0026amp; Washer\u003c\/li\u003e\n            \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Prop Shaft Seal (Single seal with double lip design)\u003c\/span\u003e\u003c\/li\u003e\n            \u003cli\u003e2 x Water Pump Gaskets\u003c\/li\u003e\n            \u003cli\u003e1 x Grommet\u003c\/li\u003e\n            \u003cli\u003eMultiple O-Rings (various types)\u003c\/li\u003e\n            \u003cli\u003eMultiple Oil Seals (various types)\u003c\/li\u003e\n        \u003c\/ul\u003e\n    \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n    \u003cli\u003eDrain the existing gearcase oil by removing the drain and vent screws.\u003c\/li\u003e\n    \u003cli\u003eRemove the propeller assembly and disconnect the lower unit (gearcase) from the upper driveshaft housing.\u003c\/li\u003e\n    \u003cli\u003eCarefully disassemble the gearcase components, including the bearing carrier and driveshaft, laying them out in order.\u003c\/li\u003e\n    \u003cli\u003eRemove all old seals, o-rings, and gaskets from their respective locations. Thoroughly clean all surfaces of old sealant and debris.\u003c\/li\u003e\n    \u003cli\u003eInstall the new seals, o-rings, and gaskets from the kit. Ensure seals are properly seated and oriented. Lightly lubricate seals with marine grease before installation.\u003c\/li\u003e\n    \u003cli\u003eReassemble all gearcase components in reverse order, torquing bolts to manufacturer specifications.\u003c\/li\u003e\n    \u003cli\u003eReattach the lower unit to the engine.\u003c\/li\u003e\n    \u003cli\u003eRefill the gearcase with the correct type and amount of lower unit lubricant before operating. Check for leaks at the drain screw.\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 kit fits my specific Johnson\/Evinrude engine?\u003c\/summary\u003e\u003cp\u003eThis kit is designed for 2-cylinder 40, 48, and 50 HP models from 1989–2005. It may also fit 25 HP models from 1990-1995 with a 'D' suffix. The best way to confirm is by cross-referencing your engine's original gearcase part number with the numbers listed in our Part Number Matrix.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs my old gearcase seals are failing?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include milky or watery gear oil (indicating water intrusion), visible oil leaks around the propeller shaft or drain screws, or a metallic sheen in the oil from bearing wear.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this kit include both driveshaft and propeller shaft seals?\u003c\/summary\u003e\u003cp\u003eYes, this is a comprehensive kit that includes all necessary seals for a full lower unit service, including the primary propeller shaft seal and driveshaft seals.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the difference between this kit and the OEM version?\u003c\/summary\u003e\u003cp\u003eThis is an aftermarket kit designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, function, and material quality. It provides comparable performance at a better value.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should lower unit seals be replaced?\u003c\/summary\u003e\u003cp\u003eThere is no fixed interval, but seals should be inspected annually during your regular lower unit service. They should be replaced immediately if you find any signs of water in the gear lube or visible leaks.\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\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":50723801399611,"sku":"GV-HBEV-PDYC","price":36.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/GV-HBEV-PDYC.png?v=1763032190","url":"https:\/\/seasierra.com\/products\/lower-unit-gearcase-seal-kit-fits-johnson-evinrude-40-50-hp-replaces-433550","provider":"SeaSierra","version":"1.0","type":"link"}