{"product_id":"mercury-10-15-20-efi-water-pump-repair-kit-8m0135821","title":"Mercury – Complete Water Pump Kit | 9.9–20hp EFI Series | Marine-Grade Components | 8M0135821","description":"\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Complete Water Pump Kit | 9.9–20hp EFI Series | Marine-Grade Components | 8M0135821\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e There’s a certain confidence that comes from knowing your outboard’s cooling system is \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003etruly\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e up to the job. When you’re running through a narrow chan\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003enel on a rising tide or easing into a long stretch of open water, you want to trust that your engine is staying \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecool\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, steady, and protected.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e The Mercury Marine part 8M0135821 Complete Water Pump Kit gives you that peace of mind. It’s the kind of reliability that lets you focus on the moment — the sound of the hull gliding, the breeze on your face — instead of whether your outboard is running too warm.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eComplete water pump kit for Mercury 9.9–20hp EFI outboards.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Mercury 9.9hp EFI ProKicker 333cc (serial 1R008146–1R278792).\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits 10–20hp 2-cylinder EFI and SeaPro outboards (serial 0R833820 and up).\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIncludes water pump case, two gaskets, oil seal, liner, impeller, guide plate, key, and seal.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHigh-flexibility impeller elastomers designed for broad seasonal temperature ranges.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMarine-grade construction for long-term durability.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury 9.9hp EFI ProKicker (333cc).\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury 10–20hp EFI FourStroke.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury SeaPro 10–20hp models.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerfect for small skiffs, lightweight fishing boats, tenders, utility craft, jon boats, and inflatables.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA water pump is one of those parts you don’t think about until it isn’t doing its job. This kit \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eis designed\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e so you \u003c\/span\u003e\u003cem\u003e\u003cspan data-preserver-spaces=\"true\"\u003enever\u003c\/span\u003e\u003c\/em\u003e\u003cspan data-preserver-spaces=\"true\"\u003e have to think about it. W\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eith every turn of the impeller, the engine gets the cooling flow it needs — steady, reliable, and predictable. You’ll notice smoother running at idle, less heat-related strain during heavy loads, and a general sense of confidence when you push the throttle.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eTh\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ee impeller is built with elastomers that stay flexible across seasonal swings, whether you’re running in cold spring water or the warm shallows of midsummer. The fitment feels tight, precise, and clean during installation, which makes a big difference when you’re servicing the pump yourself. Ev\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eerything in the kit has its place, and once installed, it creates a sealed, efficient cooling path that protects your engine from the inside out.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eLong days on the water demand a cooling system that \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecan keep up\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e with the engine’s rhythm. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThis kit does exactly that — it stays steady, resists wear, and \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ekeeps\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e coolant flow \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003econsistent\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, even after hours of running.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhe\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003en it comes to cooling systems, guessing isn’t worth the risk. Mercury OEM parts \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eare engineered\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e around exact tolerances, materials, and flow rates \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003edesigned specifically\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for their EFI outboards. Aftermarket kits might look similar, but they often lack the consistency and durability needed in real marine conditions. Wit\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eh a Mercury Marine part, you’re getting something you can install once and trust for seasons ahead. It’s a smarter investment, a safer choice, and \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eexactly\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e what most experienced boaters recommend.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which Mercury engines does the 8M0135821 kit fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It fits Mercury 9.9hp EFI ProKicker engines and 10–20hp EFI and SeaPro models with the matching serial ranges.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: How is this different from aftermarket water pump kits?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e OEM kits use the exact elastomer compounds, sealing surfaces, and dimensions Mercury engineered for proper cooling and long service life.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I confirm this is the \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eright\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e kit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Check your serial number. If your outboard matches the listed ranges, this is the correct replacement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Is this suitable for both saltwater and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes, the materials are designed for \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003etough\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e marine environments and resist corrosion and wear in both conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation manageable for most boat owners?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e If you’re comfortable servicing your lower unit, this installs cleanly. The included parts make the job straightforward.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626555302179,"sku":"46-8M0135821","price":112.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/98-8m0135821_1.jpg?v=1698811383","url":"https:\/\/partsvu.com\/en-mx\/products\/mercury-10-15-20-efi-water-pump-repair-kit-8m0135821","provider":"PartsVu","version":"1.0","type":"link"}