{"product_id":"8m0090558-maintenance-kit-for-mercury-40hp-50hp-60hp-efi-4cyl-4-stroke-jlm-marine","title":"8M0090558 Maintenance Kit for Mercury 40HP 50HP 60HP EFI 4Cyl 4-Stroke | JLM Marine","description":"\u003ch2\u003e8M0090558 Maintenance Kit for Mercury 40HP 50HP 60HP EFI 4Cyl 4-Stroke\u003c\/h2\u003e\n\n\u003cp\u003eThis comprehensive maintenance kit is engineered for \u003cstrong\u003eMercury Quicksilver Marine 40HP, 50HP, and 60HP EFI 4-Cylinder 4-Stroke outboard motors\u003c\/strong\u003e. It provides all essential service components to keep your engine running reliably and efficiently.\u003c\/p\u003e\n\n\u003cp\u003eThis kit directly replaces OEM part number \u003cstrong\u003e8M0090558\u003c\/strong\u003e, consolidating critical maintenance items including thermostat, fuel filters (both low and high pressure), oil filter, and drain gaskets into one convenient package.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete service solution for routine maintenance intervals\u003c\/li\u003e\n\u003cli\u003eIncludes both low-pressure and high-pressure fuel filtration components\u003c\/li\u003e\n\u003cli\u003eAll necessary gaskets and seals included for proper installation\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\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e8M0090558\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 Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\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\u003eStroke\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Quicksilver Marine\u003c\/td\u003e\n\u003ctd\u003e40-50-60 EFI 4Cyl.\u003c\/td\u003e\n\u003ctd\u003e40hp 50hp 60hp\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\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 Number\u003c\/td\u003e\n\u003ctd\u003e8M0090558\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Type\u003c\/td\u003e\n\u003ctd\u003eEFI 4-Cylinder 4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eMercury 40HP, 50HP, 60HP Outboard Motors\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\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × Thermostat\u003c\/strong\u003e (8M0168892)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × Thermostat Gasket\u003c\/strong\u003e (27-887978 \u0026amp; 27-8M0177107)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × Fuel Filter Assembly\u003c\/strong\u003e (low pressure) (35-879884T)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × Fuel Filter\u003c\/strong\u003e (high pressure) (35-8M0153652)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × Oil Filter\u003c\/strong\u003e (35-8M0162829)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1+3 × Drain Gaskets\u003c\/strong\u003e (26-8M0007119 \u0026amp; 26-8M0204693)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e This kit does NOT include a water pump repair kit.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eEnsure the engine is off and cool before beginning any maintenance work. Gather all necessary tools including wrenches, drain pan, and replacement parts from this kit.\u003c\/li\u003e\n\u003cli\u003eDrain the engine oil by removing the drain plug and replacing the drain gasket with the new one provided. Install the new oil filter (35-8M0162829) after draining is complete.\u003c\/li\u003e\n\u003cli\u003eLocate and replace the low-pressure fuel filter assembly (35-879884T) in the fuel system. Ensure all connections are secure to prevent leaks.\u003c\/li\u003e\n\u003cli\u003eReplace the high-pressure fuel filter (35-8M0153652) following manufacturer torque specifications. Double-check all fuel line connections.\u003c\/li\u003e\n\u003cli\u003eRemove the thermostat housing and install the new thermostat (8M0168892) with the new gasket (27-887978 \u0026amp; 27-8M0177107). Ensure proper seating and orientation.\u003c\/li\u003e\n\u003cli\u003eRefill the engine with the manufacturer-recommended oil to the proper level. Start the engine and inspect all replaced components for leaks.\u003c\/li\u003e\n\u003cli\u003eRun the engine at idle for several minutes and re-check oil level and all filter connections. Dispose of old filters and oil properly according to local 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 maintenance kit fits my Mercury outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify that your engine is a Mercury 40HP, 50HP, or 60HP EFI 4-Cylinder 4-Stroke model. Cross-reference your current part number with 8M0090558, or use the Mercury serial number guide and parts diagrams linked above to confirm compatibility.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I perform maintenance with this kit?\u003c\/strong\u003e\u003cbr\u003e\nA: Follow Mercury's recommended service intervals, typically every 100 hours of operation or annually, whichever comes first. Oil and fuel filters should be replaced regularly to maintain optimal engine performance and longevity.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this kit include everything I need for a complete service?\u003c\/strong\u003e\u003cbr\u003e\nA: This kit includes thermostat, fuel filters (low and high pressure), oil filter, and drain gaskets. Note that it does NOT include a water pump repair kit, which may be required as part of your scheduled maintenance depending on engine hours and condition.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are signs that my fuel filters or thermostat need replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include reduced engine performance, difficulty starting, overheating, rough idling, or loss of power under load. Regular preventive replacement avoids these issues before they occur.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this maintenance kit myself or do I need a professional?\u003c\/strong\u003e\u003cbr\u003e\nA: If you have mechanical experience and the proper tools, installation is straightforward following the steps above. However, professional installation is recommended to ensure all components are correctly installed and torqued to specification.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or aftermarket?\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":51981001883961,"sku":"23KM779","price":49.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_7fff88c2-bb53-4b81-bec9-c8e663b4021b.jpg?v=1772414247","url":"https:\/\/jlmmarine.com\/es\/products\/8m0090558-maintenance-kit-for-mercury-40hp-50hp-60hp-efi-4cyl-4-stroke-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}