{"product_id":"merc-105","title":"Mercury MerCruiser Quicksilver Water Pump Housing O-Ring 29439","description":"\u003cp\u003eMercury MerCruiser Quicksilver \u003cstrong\u003e25-29439\u003c\/strong\u003e is a genuine Mercury Marine O-ring used as a sealing ring in select Mercury, Mariner, and MerCruiser water pump housing and gear housing assemblies. Mercury references list the base part number as \u003cstrong\u003e29439\u003c\/strong\u003e, with GTIN \/ UPC \u003cstrong\u003e745061133464\u003c\/strong\u003e, and supporting parts diagrams identify it at the \u003cstrong\u003ewater pump housing O-ring\u003c\/strong\u003e location.\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\u003eUsed in supported water pump housing \/ gear housing assemblies\u003c\/li\u003e\n\u003cli\u003eOEM part number: \u003cstrong\u003e25-29439\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eBase part reference: \u003cstrong\u003e29439\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eGTIN \/ UPC reference: \u003cstrong\u003e745061133464\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSize references include approximately \u003cstrong\u003e1.185 in. I.D. \/ 30.1 mm I.D.\u003c\/strong\u003e and \u003cstrong\u003e0.100 in. width \/ 2.5 mm width\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCatalog package reference: approximately \u003cstrong\u003e3.00 in. x 1.50 in. x 0.20 in.\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 is shown in Mercury references across select older Mercury \/ Mariner outboard gear housing applications, including various \u003cstrong\u003e3.9 HP, 4 HP, 4.5 HP, 6 HP, 7.5 HP, 9.8 HP, 40 HP, 60 HP, 75 HP, 110 HP\u003c\/strong\u003e, and Mark-series applications depending on serial number range. Mercury where-used data also lists select MerCruiser big-block applications, including \u003cstrong\u003e454 MAG MPI Horizon\u003c\/strong\u003e, \u003cstrong\u003e7.4L MPI MIE\u003c\/strong\u003e, \u003cstrong\u003e8.2L MIE MPI\u003c\/strong\u003e, \u003cstrong\u003e454 MAG MPI Bravo\u003c\/strong\u003e, and \u003cstrong\u003e502 MAG MPI Bravo\u003c\/strong\u003e serial ranges.\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, water pump housing, and serial number range. Always confirm compatibility using the Mercury or MerCruiser serial number and the exact parts diagram before ordering, especially because \u003cstrong\u003e25-29439\u003c\/strong\u003e appears across both outboard and MerCruiser-related applications.\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 water pump housing or gear housing assembly is opened, or if the original seal is flattened, cut, brittle, swollen, cracked, missing, or no longer sealing properly. Reusing an old water pump housing O-ring can lead to leakage or repeat lower-unit 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, pinching, or rolling during assembly. Confirm the diagram location before installation because this O-ring is used in multiple Mercury and MerCruiser assemblies.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e25-29439\u003c\/li\u003e\n\u003cli\u003e29439\u003c\/li\u003e\n\u003cli\u003eSierra 18-7156\u003c\/li\u003e\n\u003cli\u003eSierra 18-7156-9\u003c\/li\u003e\n\u003cli\u003eGLM 81230\u003c\/li\u003e\n\u003cli\u003eJohnson \/ Evinrude \/ OMC 309731\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3852537 — related cross-reference in supported applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis O-ring is commonly tied to the water pump housing area, so it is worth replacing while the pump is already apart. The safest match is by exact parts diagram callout, since \u003cstrong\u003e25-29439\u003c\/strong\u003e appears across several Mercury, Mariner, and MerCruiser applications.\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":43563842469924,"sku":"29439","price":4.94,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/0b10e925-50df-4a19-aa75-298f04dba595.png?v=1777589253","url":"https:\/\/marisolmarine.com\/products\/merc-105","provider":"Marisol Marine Company","version":"1.0","type":"link"}