{"product_id":"396355-18-2659-lower-unit-seal-kit-for-johnson-evinrude-40hp-48hp-50hp-55hp-60hp-75hp-jlm-marine","title":"396355 18-2659 Lower Unit Seal Kit for Johnson Evinrude 40HP 48HP 50HP 55HP 60HP 75HP | JLM Marine","description":"\u003ch2\u003eLower Unit Seal Kit for Johnson\/Evinrude 40HP 48HP 50HP 55HP 60HP 75HP | 396355 18-2659\u003c\/h2\u003e\n\n\u003cp\u003eThis comprehensive lower unit seal kit is engineered to fit \u003cstrong\u003eJohnson\/Evinrude outboard engines\u003c\/strong\u003e ranging from \u003cstrong\u003e40HP to 75HP\u003c\/strong\u003e manufactured between \u003cstrong\u003e1986 and 1988\u003c\/strong\u003e. Designed specifically for 2-cylinder models and 75HP small gearcase (short shaft) configurations, this kit provides all the essential seals needed for complete lower unit gearcase maintenance and rebuild.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket replacement directly replaces original equipment part numbers including \u003cstrong\u003eJohnson\/Evinrude 396355\u003c\/strong\u003e, \u003cstrong\u003eSierra 18-2659\u003c\/strong\u003e, \u003cstrong\u003eGLM 87603\u003c\/strong\u003e, and \u003cstrong\u003eMallory 9-74102\u003c\/strong\u003e, ensuring broad compatibility and reliable performance across multiple sourcing options.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete seal kit for lower unit gearcase service\u003c\/li\u003e\n\u003cli\u003eFits both 2-cylinder models (40-60HP) and small gearcase 75HP engines\u003c\/li\u003e\n\u003cli\u003eAll necessary seals included for comprehensive rebuild\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\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 (OMC)\u003c\/td\u003e\n\u003ctd\u003e396355\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-2659\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e87603\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-74102\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Johnson\/Evinrude owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/johnson-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eJohnson\/Evinrude Serial Number Guide\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\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\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\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e40HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e48HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e50HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e55HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e60HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\u003c\/td\u003e\n\u003ctd\u003eSmall Gearcase (Short Shaft)\u003c\/td\u003e\n\u003ctd\u003e75HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e40HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e48HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e50HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e55HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003e2 Cylinder\u003c\/td\u003e\n\u003ctd\u003e60HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvinrude\u003c\/td\u003e\n\u003ctd\u003eSmall Gearcase (Short Shaft)\u003c\/td\u003e\n\u003ctd\u003e75HP\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e396355\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket Cross-Reference\u003c\/td\u003e\n\u003ctd\u003e18-2659, 87603, 9-74102\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eLower Unit Gearcase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eJohnson, Evinrude\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHorsepower Range\u003c\/td\u003e\n\u003ctd\u003e40HP, 48HP, 50HP, 55HP, 60HP, 75HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Years\u003c\/td\u003e\n\u003ctd\u003e1986-1988\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis kit includes:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e1 × Complete Lower Unit Seal Kit\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan style=\"color:red;\"\u003eThe package contains all the seals and components shown in the product images.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eDisconnect the battery and remove the outboard lower unit from the engine following your service manual procedures.\u003c\/li\u003e\n\u003cli\u003eDrain all gear oil from the lower unit gearcase completely and dispose of properly.\u003c\/li\u003e\n\u003cli\u003eDisassemble the lower unit carefully, documenting the position and orientation of all components for reassembly.\u003c\/li\u003e\n\u003cli\u003eRemove all old seals, gaskets, and O-rings from the gearcase housing and propeller shaft. Clean all sealing surfaces thoroughly with a suitable solvent and inspect for wear or damage.\u003c\/li\u003e\n\u003cli\u003eInstall new seals from the kit according to the manufacturer's specifications, ensuring proper orientation and seating depth.\u003c\/li\u003e\n\u003cli\u003eApply marine-grade grease to seal lips where specified in your service manual to prevent damage during initial startup.\u003c\/li\u003e\n\u003cli\u003eReassemble the lower unit components in reverse order of disassembly, torquing all fasteners to factory specifications.\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit onto the engine, ensuring proper alignment and secure mounting.\u003c\/li\u003e\n\u003cli\u003eRefill the gearcase with the correct type and quantity of marine gear oil as specified for your engine model.\u003c\/li\u003e\n\u003cli\u003eCheck for leaks by running the engine in a test tank or on-water for several minutes.\u003c\/li\u003e\n\u003cli\u003eRecheck the gear oil level after initial operation and top off if necessary.\u003c\/li\u003e\n\u003cli\u003eDispose of all old seals and used gear oil in accordance with local environmental regulations.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this seal kit fits my specific Johnson or Evinrude engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify that your engine matches the specifications listed in the Compatible Engine Models table—specifically 40-60HP 2-cylinder models or 75HP small gearcase (short shaft) built between 1986-1988. Cross-reference your original part number (396355) or check your engine's serial number using our guide linked above.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my lower unit seals need replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include gear oil leaking from the lower unit, milky or contaminated gear oil (indicating water intrusion), unusual noise from the gearcase, or difficulty shifting gears. If you notice any of these issues, inspect and replace seals promptly to prevent further damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the lower unit seals?\u003c\/strong\u003e\u003cbr\u003e\nA: Seal replacement intervals depend on usage and operating conditions. Inspect seals annually or every 100 hours of operation, whichever comes first. Replace immediately if you detect leaks, water contamination in the gear oil, or during any lower unit rebuild or repair.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this seal kit myself or do I need a professional?\u003c\/strong\u003e\u003cbr\u003e\nA: Lower unit seal replacement requires mechanical aptitude, specialized tools, and knowledge of proper torque specifications. If you have experience with outboard maintenance and access to a service manual, DIY installation is possible. Otherwise, professional installation is strongly recommended to ensure proper sealing and prevent costly damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between this aftermarket seal kit and the OEM version?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51981022396729,"sku":"24OSK701","price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_fecf68d4-d856-48e9-b5be-85865e41f051.jpg?v=1772414744","url":"https:\/\/jlmmarine.com\/es\/products\/396355-18-2659-lower-unit-seal-kit-for-johnson-evinrude-40hp-48hp-50hp-55hp-60hp-75hp-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}