{"product_id":"merc-125","title":"Mercury MerCruiser Quicksilver O-Ring 31986","description":"\u003cp\u003eMercury MerCruiser Quicksilver \u003cstrong\u003e25-31986\u003c\/strong\u003e is a genuine Mercury Marine O-ring used as a sealing ring in select Mercury, Mariner, MerCruiser, and older sterndrive \/ outboard assemblies. Mercury parts references list this as \u003cstrong\u003e25-31986 O-RING\u003c\/strong\u003e, with manufacturer part number \u003cstrong\u003e31986\u003c\/strong\u003e and GTIN \/ UPC \u003cstrong\u003e745061135390\u003c\/strong\u003e. It is a broad-use OEM sealing part best matched by the exact Mercury parts diagram callout.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury Marine \/ Quicksilver O-ring reference\u003c\/li\u003e\n\u003cli\u003eOEM part number: \u003cstrong\u003e25-31986\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eBase part reference: \u003cstrong\u003e31986\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eGTIN \/ UPC reference: \u003cstrong\u003e745061135390\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCatalog package reference: approximately \u003cstrong\u003e3.50 in. x 3.50 in. x 0.75 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCatalog weight reference: approximately \u003cstrong\u003e0.02 lb\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAftermarket size reference: \u003cstrong\u003e2.635 in. \/ 67 mm I.D. x 0.210 in. \/ 5.3 mm width\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis O-ring appears in Mercury parts references across many older Mercury \/ Mariner outboard applications, including select \u003cstrong\u003e35 HP, 40 HP, 45 HP, 50 HP, 60 HP, 65 HP, 70 HP\u003c\/strong\u003e, and related \u003cstrong\u003e350, 400, 402, 450, 500, and 650\u003c\/strong\u003e model-family listings depending on serial number range. Mercury where-used data also lists older MerCruiser-related applications including \u003cstrong\u003e“0” sterndrive 1965–1966\u003c\/strong\u003e and \u003cstrong\u003e60 Renault 68 I\/L4 1965–1968\u003c\/strong\u003e references.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eO-ring fitment depends on the exact engine, drive, gear housing, component group, and serial number range. Always confirm compatibility using the Mercury or MerCruiser serial number and the exact parts diagram before ordering, especially because \u003cstrong\u003e25-31986\u003c\/strong\u003e appears across many different assemblies.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace this O-ring whenever the related assembly is opened, or if the original seal is flattened, cut, brittle, swollen, cracked, missing, or no longer sealing properly. Reusing an old compressed O-ring can lead to leaks and repeat service.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eClean the O-ring groove and mating surface before installation. Lightly lubricate the O-ring with the service-manual-approved lubricant where specified, and make sure it seats evenly without twisting, stretching, pinching, or rolling during assembly. Confirm the exact diagram location before installation because this O-ring has broad Mercury and MerCruiser usage.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e25-31986\u003c\/li\u003e\n\u003cli\u003e31986\u003c\/li\u003e\n\u003cli\u003eSierra 18-7160\u003c\/li\u003e\n\u003cli\u003eGLM 83340\u003c\/li\u003e\n\u003cli\u003eMallory 9-76545\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3852866 — related cross-reference in supported applications\u003c\/li\u003e\n\u003cli\u003eOMC \/ Johnson \/ Evinrude 0508490, 0913850, 3852866 — related cross-reference references\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis is a broad-use sealing ring, so the safest match is the exact diagram callout rather than engine horsepower alone. The size can help confirm the part, but serial number and diagram location are the most reliable way to avoid ordering the wrong O-ring.\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":43563851513892,"sku":"31986","price":6.87,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/1d907019-2264-4e71-8f1e-0f1deba19460.png?v=1777590625","url":"https:\/\/marisolmarine.com\/products\/merc-125","provider":"Marisol Marine Company","version":"1.0","type":"link"}