{"product_id":"thermostat-143-f-62-c-fits-johnson-evinrude-6-250-hp-replaces-5005440-378065-393659","title":"Thermostat (143°F\/62°C) – Fits Johnson\/Evinrude 6-250 HP (Replaces 5005440, 378065, 393659)","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\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  table.ss-table th {\n    white-space:nowrap;       \n    word-break:normal;        \n    letter-spacing:normal;    \n    font-weight:600;\n    background:#f8fafc;\n  }\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\u003csection\u003e\n    \u003ch2\u003eProduct Details\u003c\/h2\u003e\n    \u003cp\u003eThis aftermarket \u003cstrong\u003eThermostat (143°F\/62°C) – Fits Johnson\/Evinrude 6-250 HP (Replaces 5005440, 378065, 393659)\u003c\/strong\u003e is designed for a broad range of Johnson\/Evinrude outboard engines. It is engineered for E-TEC models from 40-250 HP, Cross V4 \u0026amp; V6 models from 6-55 HP, and 9.9-15 HP 4-Stroke models manufactured between 1994 and 2001.\u003c\/p\u003e\n    \u003cp\u003eIt serves as a direct replacement for multiple OEM and aftermarket part numbers, including Johnson\/Evinrude 5005440, 378065, 393659, 434841, Sierra 18-3543, GLM 13010, and Mallory 9-43019, ensuring wide compatibility.\u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Installs as a direct replacement with no modifications required.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eRegulates Temperature:\u003c\/strong\u003e Opens at 143°F (62°C) to maintain optimal engine operating temperature.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built from corrosion-resistant stainless steel and brass to withstand harsh marine environments.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n    \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n    \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\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                \u003c\/tr\u003e\n            \u003c\/thead\u003e\n            \u003ctbody\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e378065\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e393659\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e434841\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e437414\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e508626\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3543\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3553\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e13010\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-43019\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n    \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n    \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n    \u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n    \u003cp\u003eThis thermostat is designed for a wide range of Johnson and Evinrude 2-stroke and 4-stroke outboard motors, including E-TEC, Ficht, and various V4\/V6 platforms.\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\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eV4 \u0026amp; V6 Models\u003c\/td\u003e\n\u003ctd\u003e40-250\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003eE-TEC models\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eVarious Models\u003c\/td\u003e\n\u003ctd\u003e6-55\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003eCross V4 \u0026amp; V6 models\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eVarious Models\u003c\/td\u003e\n\u003ctd\u003e9.9-15\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1994–2001\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eE-TEC Models\u003c\/td\u003e\n\u003ctd\u003e200-225\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004–2012\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003e3.3 Liter\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eE-TEC Models\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2007–2012\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003e3.3 Liter\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eE-TEC Models\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2008–2010\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003e3.4 Liter\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eE-TEC Models\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2008–2012\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003e3.4 Liter\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eFicht Models\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003e3.3 Liter\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eFicht Models\u003c\/td\u003e\n\u003ctd\u003e225\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004–2005\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003e3.3 Liter\u003c\/td\u003e\n\u003c\/tr\u003e\n                \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003eFicht Models\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004\u003c\/td\u003e\n\u003ctd\u003e5005440\u003c\/td\u003e\n\u003ctd\u003e3.3 Liter\u003c\/td\u003e\n\u003c\/tr\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n    \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n    \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n    \u003cdl\u003e\n        \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eOutboard Engine Thermostat\u003c\/dd\u003e\n        \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect Replacement\u003c\/dd\u003e\n        \u003cdt\u003eOpening Temperature\u003c\/dt\u003e\n\u003cdd\u003e143°F (62°C)\u003c\/dd\u003e\n        \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eStainless Steel\/Brass (varies by brand)\u003c\/dd\u003e\n        \u003cdt\u003eOperating Temperature\u003c\/dt\u003e\n\u003cdd\u003e62°C–93°C (143°F–200°F)\u003c\/dd\u003e\n        \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eVaries by manufacturer (typically 1 year)\u003c\/dd\u003e\n    \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n    \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003e1 x Thermostat (5005440)\u003c\/li\u003e\n        \u003cli\u003e2 x Thermostat Seals (0329319) - included with some kits\u003c\/li\u003e\n    \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n    \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n    \u003col\u003e\n        \u003cli\u003eDisconnect the battery before beginning work.\u003c\/li\u003e\n        \u003cli\u003eAllow the engine to cool completely and drain the cooling system.\u003c\/li\u003e\n        \u003cli\u003eLocate the thermostat housing on the engine block or cylinder head.\u003c\/li\u003e\n        \u003cli\u003eRemove the housing bolts, noting the orientation of the old thermostat before removing it.\u003c\/li\u003e\n        \u003cli\u003eClean the mating surfaces of the housing and engine block, removing any old gasket material.\u003c\/li\u003e\n        \u003cli\u003eInstall the new thermostat in the correct orientation, followed by the new seal or gasket.\u003c\/li\u003e\n        \u003cli\u003eRe-install the housing cover and tighten the bolts to the manufacturer's specified torque.\u003c\/li\u003e\n        \u003cli\u003eRefill the cooling system with the appropriate coolant, checking for any leaks.\u003c\/li\u003e\n        \u003cli\u003eReconnect the battery, start the engine, and let it reach operating temperature while monitoring for proper function and leaks.\u003c\/li\u003e\n    \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n    \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eHow do I know if my thermostat has failed?\u003c\/summary\u003e\n        \u003cp\u003eCommon signs include the engine overheating or running too cold (failing to reach normal operating temperature). Overheating can cause severe engine damage, while running too cool reduces fuel efficiency and accelerates engine wear.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eWhat is the correct operating temperature for this thermostat?\u003c\/summary\u003e\n        \u003cp\u003eThis thermostat begins to open at 143°F (62°C) to allow coolant to circulate. The engine's normal operating temperature range with this part installed is typically 143°F–200°F (62°C–93°C).\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eAre gaskets or seals included in the package?\u003c\/summary\u003e\n        \u003cp\u003ePackage contents can vary. While some kits may include two thermostat seals (Part No. 0329319), others do not. Always check the contents upon receipt and be prepared to purchase seals separately if they are not included.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eHow often should I replace my outboard thermostat?\u003c\/summary\u003e\n        \u003cp\u003eIt is recommended to inspect the thermostat annually and replace it every 2-3 years as part of routine cooling system maintenance. Replacement is especially important for boats operated in saltwater environments.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eMy engine is listed as compatible, but the part looks different from my original. What should I do?\u003c\/summary\u003e\n        \u003cp\u003eDo not install the part. Visually compare the new thermostat against your old one before installation. Manufacturing variations can occur. If you notice any differences, please contact our support team before proceeding.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eOEM vs. Aftermarket?\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\u003eShipping speed \u0026amp; 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\u003eWarranty \u0026amp; returns\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\u003c\/section\u003e\n\u003csection\u003e\n    \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n        \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n        \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\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 tested for real-world conditions.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing 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":50723973562683,"sku":"23TH615","price":16.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Thermostat_for_Johnson-Evinrude_378065_393659_434841_437414_5005440___5005440_435491_833072003_18-3536_-_JLM_MARINE-8291316.jpg?v=1763038908","url":"https:\/\/seasierra.com\/products\/thermostat-143-f-62-c-fits-johnson-evinrude-6-250-hp-replaces-5005440-378065-393659","provider":"SeaSierra","version":"1.0","type":"link"}