{"product_id":"merc-820","title":"Mercury MerCruiser Thermostat Retainer 861949T","description":"\u003cp\u003eMercury MerCruiser Quicksilver 861949T is a genuine OEM \u003cstrong\u003ethermostat retainer\u003c\/strong\u003e used in MerCruiser big-block cooling-system assemblies. Current Mercury dealer and parts-diagram sources identify 861949T as \u003cstrong\u003eRETAINER Thermostat \/ RETAINER-T STAT\u003c\/strong\u003e, and place it in the \u003cstrong\u003ecooling system, fresh water components\u003c\/strong\u003e and \u003cstrong\u003eclosed cooling system\u003c\/strong\u003e sections rather than as a general hardware part.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury MerCruiser OEM part number \u003cstrong\u003e861949T\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eCataloged as \u003cstrong\u003eRETAINER Thermostat \/ RETAINER-T STAT\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eUsed in MerCruiser \u003cstrong\u003efresh-water and closed-cooling\u003c\/strong\u003e assemblies.\u003c\/li\u003e\n\u003cli\u003eCurrent dealer listing shows \u003cstrong\u003eGTIN 745061476332\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eCurrent shipping-spec listing shows approximate packaged size of \u003cstrong\u003e4.50 x 3.00 x 0.65 in\u003c\/strong\u003e and weight of \u003cstrong\u003e0.30 lb\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe strongest supportable fitment for 861949T is \u003cstrong\u003eMerCruiser 496 MAG, 496 MAG HO, 496 MAG EC, 496 HO Bravo, 8.1L inboard, 8.1L HO inboard, and 8.1L Towsport\u003c\/strong\u003e applications shown in current Mercury dealer where-used references. Current parts diagrams also place it in the cooling-system assemblies for \u003cstrong\u003e8.1L \/ 496 CID MAG\u003c\/strong\u003e engines.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eVerify fitment by exact \u003cstrong\u003eengine serial number\u003c\/strong\u003e and cooling-system diagram before ordering. Current Mercury where-used references show 861949T across multiple serial breaks within the 496 MAG and 8.1L families, so the safest match is the exact serial-based parts breakdown rather than engine family name alone.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis retainer is typically replaced when it is corroded, damaged, warped, or no longer secures the thermostat correctly during cooling-system service. Because 861949T sits in the thermostat and heat-exchanger area of the closed\/fresh-water cooling layout, correct sealing pressure and proper fit matter more than appearance alone. This service guidance is a practical inference based on its documented thermostat-retainer role in the cooling assembly.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eInstall 861949T only after confirming the correct MerCruiser cooling-system diagram for the engine being serviced. Current parts diagrams place it with the thermostat, thermostat seal, washers, screws, and heat exchanger in the fresh-water \/ closed-cooling section, so it should be matched against the exact assembly before service.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eCurrent sources reviewed show \u003cstrong\u003e861949T\u003c\/strong\u003e as the active OEM Mercury number. The sources checked did not show a clearly supported newer superseding Mercury number for this retainer.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis is the kind of part that sounds generic until you look at the application. Matching \u003cstrong\u003e861949T\u003c\/strong\u003e to the exact \u003cstrong\u003e496 MAG \/ 8.1L cooling-system diagram\u003c\/strong\u003e is the safer move, because thermostat-area parts can look simple while still being specific to one crossover and heat-exchanger layout.\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":43563893915684,"sku":"861949T","price":67.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/209af1ba-8909-4e27-b957-5af790cd325b.png?v=1776806280","url":"https:\/\/marisolmarine.com\/products\/merc-820","provider":"Marisol Marine Company","version":"1.0","type":"link"}