{"product_id":"thermostat-housing-assembly-fits-mercury-mariner-75-150-hp-4-stroke-efi-outboards-replaces-892864t06-8m0090819-892864a06","title":"Thermostat Housing Assembly – Fits Mercury\/Mariner 75-150 HP 4-Stroke EFI Outboards (Replaces 892864T06, 8M0090819, 892864A06)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis complete \u003cstrong\u003eThermostat Housing Assembly – Fits Mercury\/Mariner 75-150 HP 4-Stroke EFI Outboards (Replaces 892864T06, 8M0090819, 892864A06)\u003c\/strong\u003e is a direct-fit replacement for specified Mercury\/Mariner 75-150 HP 4-Stroke EFI outboards (2001–2014). It ensures your engine maintains the correct operating temperature for optimal performance and fuel efficiency.\u003c\/p\u003e\n\u003cp\u003eThis part serves as a direct interchange for Mercury part numbers 892864T06 (superseded by 8M0090819) and 892864A06, as well as aftermarket equivalents from Sierra and GLM.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Direct bolt-on design matches OEM specifications for a hassle-free fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Constructed from a robust, marine-grade metal alloy to resist corrosion in freshwater and saltwater environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Includes the housing, pre-installed 120°F thermostat, O-ring seal, and clamp for a comprehensive repair.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eSuperseded By\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003e8M0090819\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e8M0090819\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e892864A06\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3633\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3635\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3635-K\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e13612\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model and year in the table below. Verifying your engine's serial number against the listed range is critical for ensuring correct fitment.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e75\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e80\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 0P459572-2B094995, 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e90\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e100\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 0P459572-2B094995, 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eEFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e75\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eEFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e90\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eEFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e150\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2014\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B905505 \u0026amp; Up\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e75\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e80\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 0P459572-2B094995, 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e90\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e100\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 0P459572-2B094995, 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2009\u003c\/td\u003e\n        \u003ctd\u003e892864T06\u003c\/td\u003e\n        \u003ctd\u003eSerial range: 1B366823-2B094995\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eThermostat Housing Assembly with Thermostat\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect-fit OEM replacement\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eGasoline\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003eBolt-on\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eMarine-grade metal alloy\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003eApproximately 100 mm × 90 mm × 150 mm\u003c\/dd\u003e\n  \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eDirect bolt-on\u003c\/dd\u003e\n  \u003cdt\u003eOperating Temperature\u003c\/dt\u003e\n\u003cdd\u003e48.8°C\/50°C (120°F) rated thermostat\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eVaries by manufacturer (typically 1 year)\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eComplete assembly includes housing, thermostat, O-ring and clamp\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Thermostat Housing Assembly (Replaces 892864T06\/8M0090819\/892864A06)\u003c\/li\u003e\n  \u003cli\u003e1 x Thermostat (pre-installed in housing)\u003c\/li\u003e\n  \u003cli\u003e1 x O-ring seal (Replaces 8M005958)\u003c\/li\u003e\n  \u003cli\u003e1 x Clamp (Replaces 888988008)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the negative battery terminal to prevent electrical shorts.\u003c\/li\u003e\n  \u003cli\u003eAllow the engine to cool completely. Drain the engine block's cooling system according to the manufacturer's service manual.\u003c\/li\u003e\n  \u003cli\u003eCarefully disconnect the hoses attached to the thermostat housing, noting their orientation.\u003c\/li\u003e\n  \u003cli\u003eUnbolt and remove the old housing assembly from the engine block.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean the mounting surface on the engine, ensuring it is free of old gasket material or corrosion.\u003c\/li\u003e\n  \u003cli\u003ePosition the new O-ring seal correctly on the new thermostat housing assembly.\u003c\/li\u003e\n  \u003cli\u003eSecure the new housing to the engine, tightening bolts to the manufacturer's specified torque in a cross-pattern.\u003c\/li\u003e\n  \u003cli\u003eReconnect all hoses and secure them firmly with the appropriate clamps.\u003c\/li\u003e\n  \u003cli\u003eRefill the cooling system with the recommended coolant mixture.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, start the engine, and carefully check for any coolant leaks around the new housing and hose connections.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if my thermostat housing is failing?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs of a faulty thermostat or housing include the engine overheating at low speeds, visible coolant leaks or chalky residue around the housing, or erratic temperature gauge readings.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs the thermostat included with this housing?\u003c\/summary\u003e\n  \u003cp\u003eYes, this is a complete assembly that includes the housing, a pre-installed 120°F (50°C) thermostat, the O-ring seal, and a new clamp. It is ready for installation out of the box.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhy is my engine overheating after installation?\u003c\/summary\u003e\n  \u003cp\u003eIf overheating occurs after installing the new assembly, check for airlocks in the cooling system, ensure hoses are correctly connected and unclogged, and verify the cooling system was refilled to the proper level. Also, confirm the water pump is functioning correctly.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eMy engine's serial number isn't listed. Can I still use this part?\u003c\/summary\u003e\n  \u003cp\u003eTo ensure proper fit and function, we strongly advise against using this part if your engine's model and serial number are not explicitly listed. Even small differences can lead to leaks or improper cooling.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the difference between an OEM and an aftermarket part?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are your shipping speed and cost?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n  \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement part, not an Original Equipment Manufacturer (OEM) component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is highly recommended for safety and to ensure proper performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — With free standard delivery to most regions, you can expect your parts in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — We deliver fair pricing on quality components by eliminating intermediary costs without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718257021243,"sku":"GH-TH21010-M","price":47.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/GH-TH21010-M.png?v=1762958198","url":"https:\/\/seasierra.com\/products\/thermostat-housing-assembly-fits-mercury-mariner-75-150-hp-4-stroke-efi-outboards-replaces-892864t06-8m0090819-892864a06","provider":"SeaSierra","version":"1.0","type":"link"}