{"product_id":"merc-1126","title":"Mercury Verado L6 Water Pump Repair Kit 5.44\" Gearcase - 8M0078858","description":"\u003cp\u003eThe \u003cstrong\u003eMercury Quicksilver 8M0078858\u003c\/strong\u003e is a genuine Mercury Marine OEM \u003cstrong\u003ewater pump repair kit\u003c\/strong\u003e used on select high-horsepower Mercury Verado outboards. This kit services the raw-water pump assembly in the lower unit, helping restore proper cooling-water flow from the gearcase up to the powerhead.\u003c\/p\u003e\n\u003cp\u003eIt is commonly associated with select \u003cstrong\u003e6-cylinder Mercury Verado\u003c\/strong\u003e and related high-output applications using the \u003cstrong\u003e5.44-inch heavy-duty gearcase\u003c\/strong\u003e where the factory parts diagram calls for \u003cstrong\u003e8M0078858\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury Marine OEM water pump repair kit.\u003c\/li\u003e\n\u003cli\u003eMercury\/Quicksilver part number: \u003cstrong\u003e8M0078858\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eUPC reference: \u003cstrong\u003e745061916265\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eDesigned for select Mercury Verado outboards where specified.\u003c\/li\u003e\n\u003cli\u003eUsed with select \u003cstrong\u003e5.44-inch heavy-duty gearcase\u003c\/strong\u003e applications.\u003c\/li\u003e\n\u003cli\u003eServices the lower-unit water pump assembly for proper raw-water cooling flow.\u003c\/li\u003e\n\u003cli\u003eIncludes major water pump housing, impeller, gasket, seal, key, and carrier components where supplied in the factory kit.\u003c\/li\u003e\n\u003cli\u003eImportant service kit for overheating prevention, weak telltale flow, seasonal maintenance, and lower-unit pump rebuilds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eTypical Kit Contents\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFactory kit contents may include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRubber water pump impeller\u003c\/li\u003e\n\u003cli\u003eUpper impeller housing\u003c\/li\u003e\n\u003cli\u003eLower impeller housing\u003c\/li\u003e\n\u003cli\u003eFace plate\u003c\/li\u003e\n\u003cli\u003eGaskets and seals\u003c\/li\u003e\n\u003cli\u003eDrive key\u003c\/li\u003e\n\u003cli\u003eFace seal\u003c\/li\u003e\n\u003cli\u003eSeal carrier reference \u003cstrong\u003e8M0046297\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWater tube coupling\u003c\/li\u003e\n\u003cli\u003eRelated pump hardware and service components where supplied\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eConfirm the exact kit contents against the Mercury parts diagram and package before installation.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eCommon application context includes select Mercury outboards where the factory lower-unit diagram calls for \u003cstrong\u003e8M0078858\u003c\/strong\u003e, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSelect \u003cstrong\u003eMercury Verado L6 \/ 6-cylinder\u003c\/strong\u003e outboards.\u003c\/li\u003e\n\u003cli\u003eSelect \u003cstrong\u003e200 HP, 225 HP, 250 HP, 275 HP, 300 HP, 350 HP, and 400 HP\u003c\/strong\u003e Verado configurations where specified.\u003c\/li\u003e\n\u003cli\u003eSelect \u003cstrong\u003eMercury Racing 400R\u003c\/strong\u003e applications where the parts diagram confirms this kit.\u003c\/li\u003e\n\u003cli\u003eSelect outboards using the matching \u003cstrong\u003e5.44-inch heavy-duty gearcase\u003c\/strong\u003e water pump layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUse this kit only where the Mercury parts diagram specifically calls for \u003cstrong\u003e8M0078858\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eConfirm fitment by engine serial number, horsepower, gearcase size, lower-unit style, water pump housing layout, and factory Mercury parts diagram before ordering. Verado engines can use different pump kits depending on gearcase size, production range, and application. Do not select this kit by horsepower alone.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace the water pump components during scheduled lower-unit service or whenever the engine shows weak water flow, overheating, high operating temperature, poor telltale output, impeller damage, melted housing surfaces, cracked pump housings, worn gaskets, or suspected dry-run damage. The pump should also be serviced after long storage, sand or debris ingestion, or any lower-unit teardown where the pump assembly is removed.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eInspect the driveshaft, pump base, housing surfaces, water tube, grommets, key, seals, and gearcase mating surfaces before installation. Install the impeller in the correct rotation and make sure the drive key is fully seated. Replace disturbed gaskets and seals rather than reusing compressed or torn components.\u003c\/p\u003e\n\u003cp\u003eAfter installation, refill and inspect the lower unit as required, then run the engine on a proper water supply and confirm strong cooling-water flow and stable operating temperature before returning the boat to service.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8M0078858\u003c\/strong\u003e — Mercury\/Quicksilver OEM water pump repair kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e745061916265\u003c\/strong\u003e — UPC reference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8M0046297\u003c\/strong\u003e — seal carrier reference included in the supplied kit contents; verify by diagram\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis kit should be matched by \u003cstrong\u003egearcase size and serial number\u003c\/strong\u003e, not just by Verado horsepower. The 5.44-inch heavy-duty gearcase uses a different pump layout than smaller gearcase configurations. For best results, inspect the water tube coupling, pump base, and driveshaft sealing area during the same service so the rebuilt pump can deliver full cooling flow.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563913019428,"sku":"8M0078858","price":347.04,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/27d47080-7713-45a0-a382-e3949bcd6770.png?v=1781289276","url":"https:\/\/marisolmarine.com\/products\/merc-1126","provider":"Marisol Marine Company","version":"1.0","type":"link"}