{"product_id":"805218t-temperature-sensor-sender-for-mercruiser-jlm-marine","title":"805218T Temperature Sensor Sender for MerCruiser | JLM Marine","description":"\u003ch2\u003eTemperature Sensor Sender 805218T – Fits MerCruiser 3.0, 4.3, 5.0 Engines\u003c\/h2\u003e\n\n\u003cp\u003eThis engine temperature sensor sender is designed for MerCruiser inboard and sterndrive engines, providing accurate temperature readings to protect your engine from overheating. It is compatible with popular MerCruiser engine models including 3.0L, 4.3L, and 5.0L configurations.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect Replacements:\u003c\/strong\u003e MerCruiser 805218T, 805218 | Sierra 18-7600\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNew aftermarket temperature sensor sender for reliable engine monitoring\u003c\/li\u003e\n  \u003cli\u003eDirect-fit replacement for factory temperature sender units\u003c\/li\u003e\n  \u003cli\u003eEasy installation with standard sensor threads\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\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\u003eMerCruiser\u003c\/td\u003e\n      \u003ctd\u003e805218T\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMerCruiser\u003c\/td\u003e\n      \u003ctd\u003e805218\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSierra\u003c\/td\u003e\n      \u003ctd\u003e18-7600\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003eModel\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMerCruiser\u003c\/td\u003e\n      \u003ctd\u003e3.0L Engines\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMerCruiser\u003c\/td\u003e\n      \u003ctd\u003e4.3L Engines\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMerCruiser\u003c\/td\u003e\n      \u003ctd\u003e5.0L Engines\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProduct Type\u003c\/td\u003e\n      \u003ctd\u003eEngine Temperature Sensor Sender\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCondition\u003c\/td\u003e\n      \u003ctd\u003eNew Aftermarket\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplication\u003c\/td\u003e\n      \u003ctd\u003eMerCruiser Inboard\/Sterndrive Engines\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 × Temperature Sensor Sender\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003eDisconnect the negative battery cable to prevent electrical shorts during installation.\u003c\/li\u003e\n  \u003cli\u003eAllow the engine to cool completely before beginning work to avoid burns from hot coolant or engine components.\u003c\/li\u003e\n  \u003cli\u003eLocate the existing temperature sensor sender on your engine block (typically near the thermostat housing or cylinder head).\u003c\/li\u003e\n  \u003cli\u003eDisconnect the electrical connector from the old sensor by pressing the release tab and pulling gently.\u003c\/li\u003e\n  \u003cli\u003eUsing an appropriate wrench or socket, carefully unscrew the old temperature sensor in a counterclockwise direction.\u003c\/li\u003e\n  \u003cli\u003eInspect the sensor port threads for damage or debris and clean if necessary.\u003c\/li\u003e\n  \u003cli\u003eApply a thin coat of thread sealant (not Teflon tape) to the threads of the new sensor to prevent coolant leaks.\u003c\/li\u003e\n  \u003cli\u003eHand-thread the new sensor into the port clockwise until finger-tight, ensuring it seats properly.\u003c\/li\u003e\n  \u003cli\u003eTighten the sensor to the manufacturer's recommended torque specification using a torque wrench (typically 8-12 ft-lbs).\u003c\/li\u003e\n  \u003cli\u003eReconnect the electrical connector to the new sensor until it clicks securely into place.\u003c\/li\u003e\n  \u003cli\u003eReconnect the negative battery cable and start the engine to verify proper gauge operation.\u003c\/li\u003e\n  \u003cli\u003eCheck for coolant leaks around the sensor and verify that the temperature gauge responds correctly as the engine warms up.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow do I confirm this temperature sensor fits my MerCruiser engine?\u003c\/strong\u003e\u003cbr\u003e\nVerify your engine model (3.0L, 4.3L, or 5.0L) and cross-reference the OEM part numbers (805218T or 805218) with your current sensor. The compatible engine models table above provides additional fitment guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat are the signs that my temperature sensor needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nCommon symptoms include erratic temperature gauge readings, a gauge that stays at cold or pegged at hot, the check engine light illuminating, or engine overheating due to inaccurate temperature data sent to the ECU.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow often should I replace the engine temperature sensor?\u003c\/strong\u003e\u003cbr\u003e\nTemperature sensors typically last 5-10 years or 500-1,000 engine hours under normal conditions. Replace immediately if you experience gauge malfunctions, coolant leaks at the sensor, or temperature-related fault codes.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use Teflon tape on the sensor threads?\u003c\/strong\u003e\u003cbr\u003e\nNo, use only liquid thread sealant rated for coolant systems. Teflon tape can break off and contaminate the cooling system or interfere with the sensor's electrical ground connection through the threads.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWill this sensor work with both analog and digital gauge systems?\u003c\/strong\u003e\u003cbr\u003e\nYes, this sensor is designed to work with factory MerCruiser gauge systems, whether analog needle-type or digital displays, as it provides the standard resistance signal expected by MerCruiser instrumentation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOEM vs. Aftermarket?\u003c\/strong\u003e\u003cbr\u003e\nThis listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nWe offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nThis product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n  \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51983452504377,"sku":"24TS443","price":22.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_093caadd-6d82-4f64-8ae8-9365ab1f5a7b.jpg?v=1772505065","url":"https:\/\/jlmmarine.com\/es\/products\/805218t-temperature-sensor-sender-for-mercruiser-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}