{"product_id":"merc-264","title":"Mercury MerCruiser Quicksilver Water Pump Gear Housing Gasket 426311","description":"\u003cp\u003eMercury MerCruiser Quicksilver 27-426311 is an OEM-style water pump to gear housing gasket used in select Mercury and Mariner gear housing water pump assemblies. This gasket seals between the water pump base and gear housing, helping maintain proper cooling-water flow and reducing the risk of leakage at the pump mounting surface. Current Mercury parts references show 426311 superseding to 8M0204678 as the functional replacement.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eWater pump to gear housing gasket for select Mercury, Mariner, and MerCruiser applications\u003c\/li\u003e\n\u003cli\u003eUsed at the water pump base \/ gear housing sealing surface\u003c\/li\u003e\n\u003cli\u003eSupports proper water pump sealing during impeller or water pump service\u003c\/li\u003e\n\u003cli\u003eOEM reference number: 27-426311\u003c\/li\u003e\n\u003cli\u003eCurrent replacement reference: 8M0204678\u003c\/li\u003e\n\u003cli\u003eLightweight gasket; catalog shipping reference for related 42631 listing shows approximately 0.02 lb with package dimensions around 3.75 in. x 2.78 in. x 0.25 in.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis gasket is commonly shown in Mercury parts references for select Mercury and Mariner V6 outboard gear housing \/ water pump assemblies, including various Magnum II, Magnum III, V-135, V-150, V-150 EFI\/DFI, V-200 EFI, V-220, XR-4, and related 2.4L \/ 2.5L applications depending on serial range. It is also cross-referenced in aftermarket listings for MerCruiser stern drive and Mercury Marine outboard water pump gasket applications.\u003c\/p\u003e\n\u003ch2\u003eSerial Number Fitment Notice\u003c\/h2\u003e\n\u003cp\u003eMercury gasket fitment varies by engine model, gear housing, water pump base, and serial number range. Always confirm compatibility using the engine or drive serial number before ordering, especially where older part number 27-426311 has been replaced by 8M0204678.\u003c\/p\u003e\n\u003ch2\u003eWhen This Part Needs Replacement\u003c\/h2\u003e\n\u003cp\u003eReplace this gasket whenever the water pump base is removed, during impeller service, or when there are signs of leakage, gasket compression, tearing, or surface damage. Reusing a compressed gasket can lead to poor sealing and repeat cooling-system service.\u003c\/p\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eClean the gear housing and water pump base mating surfaces before installation. Remove old gasket material carefully without gouging the aluminum surface. Install the gasket in the correct orientation and torque the water pump fasteners according to the Mercury service manual for the specific engine or drive model.\u003c\/p\u003e\n\u003ch2\u003eAlternate \/ Superseded Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e27-426311\u003c\/li\u003e\n\u003cli\u003e426311\u003c\/li\u003e\n\u003cli\u003e27-42631-1\u003c\/li\u003e\n\u003cli\u003e27-42631\u003c\/li\u003e\n\u003cli\u003e8M0204678\u003c\/li\u003e\n\u003cli\u003e27-8M0204678\u003c\/li\u003e\n\u003cli\u003eSierra 18-2919\u003c\/li\u003e\n\u003cli\u003eGLM 31050\u003c\/li\u003e\n\u003cli\u003eMallory 9-60031\u003c\/li\u003e\n\u003cli\u003eOMC 0508835\u003c\/li\u003e\n\u003cli\u003eRedline RL2919\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eParts Desk Insight\u003c\/h2\u003e\n\u003cp\u003eThis is the kind of small gasket that is worth replacing during water pump service instead of reusing. The part number history can be confusing because 426311, 42631-1, and 8M0204678 are closely related references, so matching by serial number and water pump assembly is the safest way to avoid ordering the wrong gasket.\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":43563858690084,"sku":"426311","price":5.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/d6c99b1f-b62d-4d93-a606-4fcb814d1565.png?v=1777483196","url":"https:\/\/marisolmarine.com\/products\/merc-264","provider":"Marisol Marine Company","version":"1.0","type":"link"}