{"product_id":"merc-853","title":"Mercury Marine — Flame Arrestor Sealing Washer — 86400","description":"\u003ch2\u003eMercury MerCruiser Flame Arrestor Sealing Washer 86400\u003c\/h2\u003e\n\u003cp\u003eThe Mercury MerCruiser \u003cstrong\u003e86400\u003c\/strong\u003e is a genuine OEM sealing washer used with the flame-arrestor mounting hardware on select carbureted and EFI\/TBI MerCruiser gasoline engines. Mercury diagrams position this washer beneath the retaining nut on the flame-arrestor stud to keep the correct factory hardware arrangement.\u003c\/p\u003e\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3.0L \/ 181 CID L4\u003c\/li\u003e\n\u003cli\u003e4.3L \/ 262 CID V6 EFI\/TBI\u003c\/li\u003e\n\u003cli\u003e5.0L V8\u003c\/li\u003e\n\u003cli\u003e5.7L \/ 350 V8\u003c\/li\u003e\n\u003cli\u003eAdditional carbureted and EFI MerCruiser gasoline engines using the specified flame-arrestor stud arrangement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMerCruiser used several flame-arrestor, stud, nut, and washer combinations across different engine generations. Confirm 86400 against your engine serial number and the applicable intake or carburetor diagram before ordering.\u003c\/p\u003e\n\u003ch3\u003ePart Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePart number: 86400\u003c\/li\u003e\n\u003cli\u003eFull service number: 12-86400\u003c\/li\u003e\n\u003cli\u003eBrand: Mercury Marine\u003c\/li\u003e\n\u003cli\u003eOfficial product type: Sealing \/ flame arrestor washer\u003c\/li\u003e\n\u003cli\u003eSystem: Air intake \/ flame arrestor\u003c\/li\u003e\n\u003cli\u003eQuantity typically required: 1\u003c\/li\u003e\n\u003cli\u003eGTIN: 745061200739\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e826709109 — Flame arrestor stud nut\u003c\/li\u003e\n\u003cli\u003e863200 — Flame arrestor on applicable 3.0L engines\u003c\/li\u003e\n\u003cli\u003e805298A1 — Flame arrestor on applicable V8 engines\u003c\/li\u003e\n\u003cli\u003e805161 \/ 91842 — Flame arrestor studs on selected applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen This Part Needs Replacement\u003c\/h3\u003e\n\u003cp\u003eReplace the washer if it is missing, flattened, distorted, corroded, or damaged during flame-arrestor removal. A worn sealing washer should not be substituted with unrelated hardware simply because the diameter appears similar.\u003c\/p\u003e\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eInstall the washer in the original flame-arrestor mounting position. Applicable diagrams commonly pair 86400 with flame-arrestor stud hardware and retaining nut 826709109. Verify the flame arrestor is seated correctly before tightening the retaining hardware.\u003c\/p\u003e\n\u003ch3\u003eAlternate\/Superseded Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e86400 — Mercury OEM part number\u003c\/li\u003e\n\u003cli\u003e12-86400 — full Mercury service number\u003c\/li\u003e\n\u003cli\u003eNo verified superseding replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow many washers do I need?\u003c\/strong\u003e Applicable diagrams typically call for one washer per flame-arrestor mounting stud.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I reuse the old washer?\u003c\/strong\u003e If you are unsure whether the original washer is still flat and undamaged, replace it. A crushed or corroded washer won't seal correctly against the retaining nut.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e This washer keeps the factory flame-arrestor mounting stack intact whenever the arrestor is removed for cleaning, service, or replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon mistake:\u003c\/strong\u003e This washer is easy to overlook during flame-arrestor removal. If you are missing the original, substituting a similarly sized washer from unrelated hardware can leave a poor seal at the retaining nut.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSizing and fitment:\u003c\/strong\u003e If you are unsure whether 86400 matches your engine's flame-arrestor stud arrangement, confirm against your intake or carburetor parts diagram and serial number before ordering.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563896930340,"sku":"86400","price":2.56,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/3ec24469-b116-4674-8937-19796768cb50.png?v=1790274502","url":"https:\/\/marisolmarine.com\/products\/merc-853","provider":"Marisol Marine Company","version":"1.0","type":"link"}