{"product_id":"8m0251131-water-pump-impeller-kit-for-mercury-optimax-dfi-efi-v135-v140-v150-v175-v200-jlm-marine","title":"8M0251131 Water Pump Impeller Kit for Mercury OptiMax DFI EFI V135 V140 V150 V175 V200 | JLM Marine","description":"\u003ch2\u003eWater Pump Impeller Kit – Fits Mercury OptiMax DFI EFI V135 V140 V150 V175 V200\u003c\/h2\u003e\n\n\u003cp\u003eThis comprehensive water pump impeller kit is designed for \u003cstrong\u003eMercury OptiMax 135-175HP DFI 2.5L models (1999-2018)\u003c\/strong\u003e, \u003cstrong\u003e150-200HP EFI models (1998-2015, serial #0G960500 to 1B227000 and up)\u003c\/strong\u003e, and \u003cstrong\u003eV135, V140, V150, V175, V200 6-cylinder engines\u003c\/strong\u003e. It provides a complete rebuild solution for your marine water pump system, ensuring reliable cooling performance and engine protection.\u003c\/p\u003e\n\n\u003cp\u003eThis kit directly replaces OEM part number \u003cstrong\u003e8M0251131\u003c\/strong\u003e and includes all essential components—impeller, gaskets, seals, o-rings, housing, thermostat, fuel filter, and gear oil pump—for a thorough, professional-grade service.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete 31-piece kit with impeller, gaskets, seals, housing, thermostats, and more\u003c\/li\u003e\n\u003cli\u003eFits OptiMax DFI and EFI V6 engines from 135HP to 200HP\u003c\/li\u003e\n\u003cli\u003eIncludes fuel filter and gear oil pump for comprehensive maintenance\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\" style=\"border-collapse:collapse; width:100%;\"\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\u003e8M0251131\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\" style=\"border-collapse:collapse; width:100%;\"\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\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eOptiMax DFI 2.5L\u003c\/td\u003e\n\u003ctd\u003e135-175HP\u003c\/td\u003e\n\u003ctd\u003e1999-2018\u003c\/td\u003e\n\u003ctd\u003eDoes not suit Pro XS models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eEFI\u003c\/td\u003e\n\u003ctd\u003e150-200HP\u003c\/td\u003e\n\u003ctd\u003e1998-2015\u003c\/td\u003e\n\u003ctd\u003eSuits serial #0G960500 to 1B227000 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eV135 6 Cyl\u003c\/td\u003e\n\u003ctd\u003e135HP\u003c\/td\u003e\n\u003ctd\u003e1998-2018\u003c\/td\u003e\n\u003ctd\u003e8058870 \u0026amp; Up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eV140 6 Cyl\u003c\/td\u003e\n\u003ctd\u003e140HP\u003c\/td\u003e\n\u003ctd\u003e1999-2018\u003c\/td\u003e\n\u003ctd\u003e4301235-0C100860\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eV150 6 Cyl\u003c\/td\u003e\n\u003ctd\u003e150HP\u003c\/td\u003e\n\u003ctd\u003e1998-2018\u003c\/td\u003e\n\u003ctd\u003e8058870 \u0026amp; Up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eV175 6 Cyl\u003c\/td\u003e\n\u003ctd\u003e175HP\u003c\/td\u003e\n\u003ctd\u003e1999-2018\u003c\/td\u003e\n\u003ctd\u003e4301235-0C100860, 8058870 \u0026amp; Up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eV200 6 Cyl\u003c\/td\u003e\n\u003ctd\u003e200HP\u003c\/td\u003e\n\u003ctd\u003e1998-2015\u003c\/td\u003e\n\u003ctd\u003e8058870 \u0026amp; Up\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\" style=\"border-collapse:collapse; width:100%;\"\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\u003e8M0251131\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eMercury OptiMax DFI EFI V6 Outboards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Configuration\u003c\/td\u003e\n\u003ctd\u003e6-Cylinder V6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Range\u003c\/td\u003e\n\u003ctd\u003e135-200HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit Components\u003c\/td\u003e\n\u003ctd\u003e31 pieces\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 comprehensive kit includes \u003cstrong\u003e31 components\u003c\/strong\u003e for a complete water pump rebuild:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e47-89984T4\u003c\/strong\u003e Water Pump Impeller × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e56654\u003c\/strong\u003e Impeller Key × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e32435 1\u003c\/strong\u003e Wear Plate × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e27-32438\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e27-426311\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e27-856081\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e27-856091\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e27-856704\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25-30271\u003c\/strong\u003e Seal × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e32-29804T\u003c\/strong\u003e Water Tube Guide × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e26-455771\u003c\/strong\u003e Seal × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-191832\u003c\/strong\u003e Drain Gasket × 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2107\u003c\/strong\u003e Seal × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2108\u003c\/strong\u003e Seal × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-31266\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-49221-1\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25-30613\u003c\/strong\u003e O-Ring × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25-33145\u003c\/strong\u003e O-Ring × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25-90011\u003c\/strong\u003e O-Ring × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25-38099\u003c\/strong\u003e O-Ring × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25-30224\u003c\/strong\u003e O-Ring × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e29967\u003c\/strong\u003e Pin × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10-96411\u003c\/strong\u003e Screw × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e48752T\u003c\/strong\u003e Insert Cup × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e26-38970\u003c\/strong\u003e Seal × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e46-96148T1\u003c\/strong\u003e Water Pump Housing × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e833072003\u003c\/strong\u003e Thermostat × 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e816296Q03\u003c\/strong\u003e Fuel Filter × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8M007119\u003c\/strong\u003e Drain Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e830749\u003c\/strong\u003e Drain Gasket × 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24OP149\u003c\/strong\u003e Gear Oil Pump × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eDisconnect the battery and remove the lower unit from the outboard motor following your service manual procedures.\u003c\/li\u003e\n\u003cli\u003eRemove the old water pump housing and carefully extract the worn impeller using needle-nose pliers; inspect the driveshaft for damage or wear.\u003c\/li\u003e\n\u003cli\u003eClean all mating surfaces thoroughly, removing old gasket material and debris with a gasket scraper and solvent.\u003c\/li\u003e\n\u003cli\u003eInstall the new wear plate onto the pump housing base, ensuring proper alignment with dowel pins.\u003c\/li\u003e\n\u003cli\u003eLubricate the new impeller with glycerin or soapy water (never petroleum-based products), then slide it onto the driveshaft with vanes oriented in the correct rotation direction.\u003c\/li\u003e\n\u003cli\u003eInsert the impeller key into the driveshaft slot to lock the impeller in position.\u003c\/li\u003e\n\u003cli\u003eApply a thin layer of marine grease to new gaskets and position them on the housing, replacing all seals and o-rings as indicated in the kit.\u003c\/li\u003e\n\u003cli\u003eInstall the water tube guide and ensure the water tube inserts properly into the pump housing without kinking.\u003c\/li\u003e\n\u003cli\u003eCarefully position the new water pump housing over the impeller, gently rotating the driveshaft to help seat the impeller vanes.\u003c\/li\u003e\n\u003cli\u003eInstall the insert cup, seals, and drain gaskets according to your engine's exploded diagram; torque all fasteners to manufacturer specifications.\u003c\/li\u003e\n\u003cli\u003eReplace the fuel filter and install the thermostats into their housings with new gaskets, ensuring correct orientation (spring side down).\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit, refill the gear oil using the included gear oil pump, reconnect the battery, and perform a water flow test before launching.\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 kit fits my Mercury engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Cross-reference your engine model, horsepower, year, and serial number with the compatibility table above. OptiMax DFI models from 1999-2018 (135-175HP, excluding Pro XS) and EFI models from 1998-2015 (150-200HP, serial #0G960500 to 1B227000 and up) are compatible. Check your lower unit's current parts or consult Mercury's parts diagrams to verify.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my water pump impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: Mercury recommends replacing the impeller every 2-3 years or 200-300 hours of operation, whichever comes first. If you notice overheating, reduced water flow from the tell-tale, or the engine has been run dry, replace the impeller immediately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my water pump is failing?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include weak or no water stream from the tell-tale indicator, engine overheating, steam from the powerhead, reduced performance, or an audible high-temperature alarm. Inspect the impeller if any of these occur.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why does this kit include a fuel filter and gear oil pump?\u003c\/strong\u003e\u003cbr\u003e\nA: This is a comprehensive service kit designed for complete lower unit maintenance during water pump replacement. The fuel filter ensures clean fuel delivery to your EFI or DFI system, and the gear oil pump allows proper refilling of the lower unit after service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this kit on Mercury Pro XS models?\u003c\/strong\u003e\u003cbr\u003e\nA: No, this kit explicitly does not fit Pro XS models. It is designed for standard OptiMax DFI and EFI engines only; Pro XS engines require different components.\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. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please contact us 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":52418317156665,"sku":"25KM251-2N","price":68.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/kit-25KM251-2N_646fde61-7586-4601-b434-3252a7c7901f.png?v=1776686843","url":"https:\/\/jlmmarine.com\/es\/products\/8m0251131-water-pump-impeller-kit-for-mercury-optimax-dfi-efi-v135-v140-v150-v175-v200-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}