{"product_id":"mercury-mercruiser-quicksilver-washer-12-8m0207778","title":"Mercury MerCruiser Quicksilver Washer 12-8M0207778 (.344 x .625 x .063)","description":"\u003ch2\u003eGenuine Mercury OEM Washer — .344\" x .625\" x .063\"\u003c\/h2\u003e\u003cp\u003eThis is the genuine OEM flat washer used in Mercury MerCruiser and Quicksilver assemblies wherever a .344\" ID × .625\" OD × .063\" thick washer is specified in the parts diagram. Manufactured to factory tolerances, it ensures correct clamping load and sealing surface protection during reassembly.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePart Number: \u003cstrong\u003e12-8M0207778\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: .344\" ID × .625\" OD × .063\" thick\u003c\/li\u003e\n\u003cli\u003eGenuine OEM — not aftermarket\u003c\/li\u003e\n\u003cli\u003eCompatible with Mercury, MerCruiser, and Quicksilver assemblies calling for this part number\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFitment\u003c\/h2\u003e\u003cp\u003eMatch this washer to your Mercury parts diagram using your engine model, serial number, and assembly location. Similar washers across Mercury product lines can vary by thickness and diameter — always confirm the part number before ordering.\u003c\/p\u003e\u003ch2\u003eWhen to Replace\u003c\/h2\u003e\u003cp\u003eReplace any time the washer is removed during service, shows signs of deformation, corrosion, or scoring, or whenever the fastener it seats is being replaced.\u003c\/p\u003e\u003ch2\u003eInstallation\u003c\/h2\u003e\u003cp\u003eEnsure mating surfaces are clean and free of debris. Follow the Mercury service manual for correct orientation, torque specifications, and any locking compound requirements.\u003c\/p\u003e\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e This washer is most commonly needed during thermostat housing, water pump, and manifold fastener service on MerCruiser inboard and stern drive engines. It provides the correct load-spreading surface under bolts and screws in areas where a standard hardware-store washer would not meet factory tolerances. Always order by the diagram part number — dimensions alone are not sufficient to confirm fitment across all Mercury assemblies.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563837194276,"sku":"12038","price":3.12,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/08424028-2224-4665-a308-9a633e028e76_d8fbff23-28be-43e9-9f78-975d5ab7223a.png?v=1786486840","url":"https:\/\/marisolmarine.com\/products\/mercury-mercruiser-quicksilver-washer-12-8m0207778","provider":"Marisol Marine Company","version":"1.0","type":"link"}