{"product_id":"merc-109","title":"Quicksilver O-Ring 8M0204651 – Mercury MerCruiser OEM","description":"\u003ch2\u003eQuicksilver O-Ring 8M0204651\u003c\/h2\u003e\u003cp\u003eThis genuine OEM O-ring is used throughout Mercury and MerCruiser engine and drive assemblies to seal fluid passages, housings, and fittings against oil, water, and fuel intrusion. Getting the right O-ring matters — even a small difference in compound, durometer, or dimensions can lead to a seal that fails prematurely under heat and pressure. This is the exact part called out in the Mercury parts diagram, engineered to the same spec as what came out of the factory.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePart Number: \u003cstrong\u003e8M0204651\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eType: O-Ring\u003c\/li\u003e\n\u003cli\u003eGenuine OEM — not aftermarket\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications\u003c\/h2\u003e\u003cp\u003eUse this O-ring wherever the Mercury or MerCruiser parts diagram specifies part number 8M0204651. It appears across multiple engine families and drive configurations — always verify against your model’s current parts diagram, serial number, and assembly location before ordering.\u003c\/p\u003e\u003ch2\u003eWhen to Replace\u003c\/h2\u003e\u003cp\u003eReplace any time you disassemble a sealed joint and the existing O-ring shows signs of flattening, cracking, hardening, swelling, or surface contamination. O-rings are a one-time-use seal — always install a fresh one on reassembly rather than reusing the old part.\u003c\/p\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eClean mating surfaces thoroughly before installation. Lightly lubricate the O-ring with the appropriate fluid (fuel-safe grease or the system fluid) to ease installation and prevent tearing. Follow the Mercury service manual for orientation and torque specifications on the surrounding hardware.\u003c\/p\u003e\u003ch2\u003eRelated Products\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/gaskets-seals-o-rings\"\u003eMarine Gaskets, Seals \u0026amp; O-Rings\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/fasteners-mounting\"\u003eFasteners \u0026amp; Mounting Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\u003cp\u003eBest used as a direct OEM replacement during fuel system, cooling system, or drive service where the parts diagram calls for 8M0204651. This O-ring is a common inclusion in rebuild and reseal jobs on MerCruiser sterndrive and Mercury outboard assemblies — order a spare if you’re doing a full service. Always match by part number: O-rings that look identical can differ in compound and will fail prematurely in the wrong application. If your assembly has been repowered or updated, cross-reference the current diagram to confirm this number hasn’t been superseded.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563842666532,"sku":"30224","price":5.68,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/image-gen-1_20260811-210452_d1305c41-a259-47e4-bcad-829dc6bde438.png?v=1786562837","url":"https:\/\/marisolmarine.com\/products\/merc-109","provider":"Marisol Marine Company","version":"1.0","type":"link"}