{"product_id":"water-pump-impeller-kit-fits-onan-4-0-7-5-kw-generators-replaces-131-0386-131-0257","title":"Water Pump Impeller Kit – Fits Onan 4.0-7.5 KW Generators (Replaces 131-0386, 131-0257)","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\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eWater Pump Impeller Kit\u003c\/strong\u003e is an aftermarket replacement designed for Onan MCCK and MDJE series marine generators, covering models in the 4.0 to 7.5 KW power range. It's engineered specifically for water pumps that use a 4-screw cover plate.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for multiple Onan and aftermarket part numbers, including 131-0386, 131-0257, and Globe 1015.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDirect OEM-spec replacement for straightforward installation.\u003c\/li\u003e\n\u003cli\u003eIncludes a 6-blade CR neoprene impeller and a matching 4-hole gasket.\u003c\/li\u003e\n\u003cli\u003eImpeller features a durable brass insert and a D-shaped shaft profile.\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 Interchange\"\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\u003eOnan\u003c\/td\u003e\n\u003ctd\u003e131-0386\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOnan\u003c\/td\u003e\n\u003ctd\u003e131-0257\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOnan\u003c\/td\u003e\n\u003ctd\u003e0131-0257\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOnan\u003c\/td\u003e\n\u003ctd\u003e170-3172\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGlobe\u003c\/td\u003e\n\u003ctd\u003e1015\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGlobe\u003c\/td\u003e\n\u003ctd\u003eP\/N 01-12-1610\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBCO\u003c\/td\u003e\n\u003ctd\u003e1015\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGCS\u003c\/td\u003e\n\u003ctd\u003e1015\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\u003eDesigned for Onan MCCK and MDJE series generators using a water pump with a 4-screw cover plate.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Compatible Onan Generator Models\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated KW\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\u003eOnan\u003c\/td\u003e\n        \u003ctd\u003eMCCK\u003c\/td\u003e\n        \u003ctd\u003e4.0\u003c\/td\u003e\n        \u003ctd\u003e131-0386, 131-0257\u003c\/td\u003e\n        \u003ctd\u003e4 screw cover pump models only\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOnan\u003c\/td\u003e\n        \u003ctd\u003eMCCK\u003c\/td\u003e\n        \u003ctd\u003e6.5\u003c\/td\u003e\n        \u003ctd\u003e131-0386, 131-0257\u003c\/td\u003e\n        \u003ctd\u003e4 screw cover pump models only\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOnan\u003c\/td\u003e\n        \u003ctd\u003eMDJE\u003c\/td\u003e\n        \u003ctd\u003e6.0\u003c\/td\u003e\n        \u003ctd\u003e131-0386, 131-0257\u003c\/td\u003e\n        \u003ctd\u003e4 screw cover pump models only\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOnan\u003c\/td\u003e\n        \u003ctd\u003eMDJE\u003c\/td\u003e\n        \u003ctd\u003e7.5\u003c\/td\u003e\n        \u003ctd\u003e131-0386, 131-0257\u003c\/td\u003e\n        \u003ctd\u003e4 screw cover pump models only\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\u003eWater Pump Impeller Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM replacement\u003c\/dd\u003e\n  \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eCR Neoprene with Brass Insert\u003c\/dd\u003e\n  \u003cdt\u003eShaft Type\u003c\/dt\u003e\n\u003cdd\u003eD-shaped\u003c\/dd\u003e\n  \u003cdt\u003eShaft Width\u003c\/dt\u003e\n\u003cdd\u003e9.5 mm (3\/8\")\u003c\/dd\u003e\n  \u003cdt\u003eImpeller Width\u003c\/dt\u003e\n\u003cdd\u003e19 mm (3\/4\")\u003c\/dd\u003e\n  \u003cdt\u003eImpeller Diameter\u003c\/dt\u003e\n\u003cdd\u003e57 mm (2-1\/4\")\u003c\/dd\u003e\n  \u003cdt\u003eNumber of Blades\u003c\/dt\u003e\n\u003cdd\u003e6\u003c\/dd\u003e\n  \u003cdt\u003eGasket Type\u003c\/dt\u003e\n\u003cdd\u003e4-hole\u003c\/dd\u003e\n  \u003cdt\u003eGasket Part Number\u003c\/dt\u003e\n\u003cdd\u003e131-0210\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e90.7 g (3.2 ounces)\u003c\/dd\u003e\n  \u003cdt\u003ePackage Dimensions\u003c\/dt\u003e\n\u003cdd\u003e121 × 90 × 31 mm (4.76 × 3.54 × 1.22 inches)\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 Water Pump Impeller (Replaces 131-0386)\u003c\/li\u003e\n  \u003cli\u003e1 x Gasket (Replaces 131-0210)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the generator's battery and close the raw water intake seacock.\u003c\/li\u003e\n  \u003cli\u003eAccess the water pump and remove the cover plate screws.\u003c\/li\u003e\n  \u003cli\u003eCarefully pry off the cover and note the rotational direction of the existing impeller blades.\u003c\/li\u003e\n  \u003cli\u003eRemove the old impeller using pliers or an impeller puller tool.\u003c\/li\u003e\n  \u003cli\u003eClean any debris or old gasket material from the pump housing and cover plate.\u003c\/li\u003e\n  \u003cli\u003eLightly lubricate the new impeller and housing interior with glycerin or soap (do not use petroleum grease).\u003c\/li\u003e\n  \u003cli\u003eInstall the new impeller, bending the blades in the direction of normal engine rotation.\u003c\/li\u003e\n  \u003cli\u003ePlace the new gasket on the clean housing face.\u003c\/li\u003e\n  \u003cli\u003eReinstall the cover plate and tighten the screws evenly in a star pattern to ensure a proper seal.\u003c\/li\u003e\n  \u003cli\u003eRe-open the seacock and reconnect the battery.\u003c\/li\u003e\n  \u003cli\u003eStart the generator and immediately check the pump and hoses for water leaks.\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 impeller kit fits my Onan generator?\u003c\/summary\u003e\u003cp\u003eThis kit is designed for Onan MCCK and MDJE series generators (4.0 to 7.5 KW) equipped with a water pump that has a 4-screw cover plate. Please verify your model and original part number against the compatibility tables on this page before ordering.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a worn or failing water pump impeller?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include the engine overheating at idle or load, a noticeable reduction in water flow from the exhaust outlet, and visible cracks, tears, or missing blades upon a physical inspection of the impeller.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should I replace the water pump impeller?\u003c\/summary\u003e\u003cp\u003eAs a preventative maintenance best practice, impellers should be inspected annually and replaced every 1-2 years or every 200-300 hours of operation, whichever comes first. Refer to your generator's service manual for manufacturer-specific maintenance intervals.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). It was built to OEM-level specifications with comparable materials, manufactured in an ISO 9002 facility, and batch-inspected for quality and consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the shipping speed and cost?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free to most regions, and any available expedited options will appear at checkout.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard return window for items that are unused and in their original condition.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images and specifications against 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 part, not an OEM component. All mentions of brand names and part numbers are for reference purposes only.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance. Improper installation can lead to engine damage.\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 rigorously tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions with a typical transit time of 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with our manufacturing partners, we provide fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50717896081723,"sku":"131-0386QM","price":29.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/131-0386QM.png?v=1762937696","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-onan-4-0-7-5-kw-generators-replaces-131-0386-131-0257","provider":"SeaSierra","version":"1.0","type":"link"}