{"product_id":"8m0251130-annual-service-kit-for-mercury-mariner-optimax-dfi-1-5l-jlm-marine","title":"8M0251130 Annual Service Kit for Mercury Mariner OptiMax DFI 1.5L | JLM Marine","description":"\u003ch2\u003e8M0251130 Annual Service Kit for Mercury Mariner OptiMax DFI 1.5L\u003c\/h2\u003e\n\n\u003cp\u003eThis comprehensive annual service kit is engineered specifically for \u003cstrong\u003eMercury Mariner OptiMax 75-115 HP DFI 1.5L engines from 1999 to 2016\u003c\/strong\u003e. It provides all the essential maintenance components needed to keep your outboard running at peak performance, including the water pump impeller, seals, gaskets, thermostat, fuel filter, and gear oil pump.\u003c\/p\u003e\n\n\u003cp\u003eDirect replacement for OEM part number \u003cstrong\u003e8M0251130\u003c\/strong\u003e, this kit simplifies your annual maintenance routine by bundling critical service parts in one package.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete maintenance solution with 17 components covering water pump, fuel system, and lubrication\u003c\/li\u003e\n\u003cli\u003eDesigned for Mercury Mariner OptiMax Direct Fuel Injection (DFI) 1.5L engines\u003c\/li\u003e\n\u003cli\u003eIncludes premium impeller, thermostat, fuel filter, and all necessary seals and gaskets\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 the OEM part number for your engine:\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 Mariner\u003c\/td\u003e\n\u003ctd\u003e8M0251130\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\u003cdiv style=\"overflow-x:auto;\"\u003e\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\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eOptiMax DFI 1.5L\u003c\/td\u003e\n\u003ctd\u003e75-115 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999-2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\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\u003e8M0251130\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Type\u003c\/td\u003e\n\u003ctd\u003eOptiMax DFI 1.5L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHorsepower Range\u003c\/td\u003e\n\u003ctd\u003e75-115 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStroke\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Years\u003c\/td\u003e\n\u003ctd\u003e1999-2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit Type\u003c\/td\u003e\n\u003ctd\u003eAnnual Service Kit\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 annual service kit includes \u003cstrong\u003e17 genuine replacement components\u003c\/strong\u003e for comprehensive maintenance:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Pump Components:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e47-43026Q02 Impeller × 1\u003c\/li\u003e\n\u003cli\u003e26-8M2014338 Seal × 1\u003c\/li\u003e\n\u003cli\u003eSeal × 1\u003c\/li\u003e\n\u003cli\u003e8172761 Plate × 1\u003c\/li\u003e\n\u003cli\u003e25-21836 O-ring × 2\u003c\/li\u003e\n\u003cli\u003e27-8M0142616 Gasket × 1\u003c\/li\u003e\n\u003cli\u003e27-8172771 Gasket × 1\u003c\/li\u003e\n\u003cli\u003e28-8M0032833 Key × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeals \u0026amp; Gaskets:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e26-45577 Seal × 1\u003c\/li\u003e\n\u003cli\u003e25-90196 O-ring × 1\u003c\/li\u003e\n\u003cli\u003e26-830749 Gasket × 3\u003c\/li\u003e\n\u003cli\u003e8M007119 Drain Gasket × 1\u003c\/li\u003e\n\u003cli\u003e830749 Drain Gasket × 3\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling System:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e833072003 Thermostat × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel System:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e35-8M0060041 Fuel Filter × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLubrication System:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e24OP149 Gear Oil Pump × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreparation:\u003c\/strong\u003e Disconnect the spark plug wires and ensure the engine is cool. Gather necessary tools including screwdrivers, wrenches, and a torque wrench.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Pump Service:\u003c\/strong\u003e Remove the lower unit from the engine following your service manual. Separate the water pump housing and remove the old impeller, plate, and seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall New Impeller:\u003c\/strong\u003e Lubricate the new impeller (47-43026Q02) with glycerin or soapy water and install it into the housing with blades oriented correctly. Insert the drive key (28-8M0032833) into the driveshaft slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplace Seals \u0026amp; Gaskets:\u003c\/strong\u003e Install the new plate (8172761), all seals (26-8M2014338, 2210, 26-45577), O-rings (25-21836, 25-90196), and gaskets (27-8M0142616, 27-8172771, 26-830749). Ensure all mating surfaces are clean and dry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReassemble Water Pump:\u003c\/strong\u003e Torque the water pump housing bolts to manufacturer specifications. Verify that the impeller rotates freely without binding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat Replacement:\u003c\/strong\u003e Locate the thermostat housing on the cylinder head and remove the cover. Replace the old thermostat with the new unit (833072003) ensuring correct orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Filter Change:\u003c\/strong\u003e Locate the fuel filter assembly on the engine. Replace the old filter element with the new fuel filter (35-8M0060041) and inspect all fuel lines for cracks or deterioration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGear Oil Service:\u003c\/strong\u003e Install the new gear oil pump (24OP149) if replacing the old unit. Drain old gear oil from the lower unit using the drain gaskets provided (8M007119, 830749).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefill Gear Oil:\u003c\/strong\u003e Refill the lower unit with fresh Mercury Premium or High-Performance gear oil to the proper level. Install new drain gaskets and torque plugs to specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinstall Lower Unit:\u003c\/strong\u003e Apply water-resistant grease to the driveshaft splines and reinstall the lower unit. Torque all mounting bolts per service manual specifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal Inspection:\u003c\/strong\u003e Double-check all fasteners, connections, and gasket seals. Reconnect spark plug wires and verify all components are properly secured.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Run:\u003c\/strong\u003e Start the engine with water supply connected (flush muffs or in-water) and check for proper water flow from the telltale. Inspect for any leaks and verify smooth operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow do I confirm this kit fits my Mercury OptiMax engine?\u003c\/strong\u003e\u003cbr\u003e\nVerify your engine is a Mercury Mariner OptiMax DFI 1.5L model rated between 75-115 HP and manufactured between 1999-2016. Check your engine's serial number plate or consult your owner's manual to confirm the model designation and year.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow often should I perform this annual service?\u003c\/strong\u003e\u003cbr\u003e\nMercury recommends performing this complete service annually or every 100 hours of operation, whichever comes first. If you operate in saltwater, sandy conditions, or commercially, consider servicing more frequently (every 50-75 hours).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat are the signs that my water pump impeller needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nWatch for reduced water flow from the telltale (indicator stream), engine overheating, steam from the powerhead, or poor performance. If the impeller is more than one year old, replace it preventively even if symptoms aren't present.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I reuse the old gaskets and seals when installing new components?\u003c\/strong\u003e\u003cbr\u003e\nNo, always replace all gaskets, seals, and O-rings during service even if they appear intact. Old gaskets compress and lose sealing ability, which can lead to leaks, air intrusion, or contamination.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo I need special tools to complete this service?\u003c\/strong\u003e\u003cbr\u003e\nBasic hand tools are sufficient for most tasks: socket set, screwdrivers, and pliers. A torque wrench is highly recommended for proper fastener tension, and a gear oil pump makes lower unit servicing cleaner and easier.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between this aftermarket kit and the OEM version?\u003c\/strong\u003e\u003cbr\u003e\nThis 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\u003eHow fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nWe 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\u003eWhat is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nThis 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":52418317254969,"sku":"25KM258-2N","price":68.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/kit-25KM258-2N_8ba43172-4200-412a-9679-01543ca62089.png?v=1776686851","url":"https:\/\/jlmmarine.com\/products\/8m0251130-annual-service-kit-for-mercury-mariner-optimax-dfi-1-5l-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}