Coolant Temp Sensor 805218T – MerCruiser EFI/MPI

Coolant Temp Sensor 805218T – MerCruiser EFI/MPI

Vendor: JLM Marine
Availability: In Stock
Product Type: Sensor
$55.77
$55.77
Subtotal: $55.77

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Coolant Temp Sensor 805218T – MerCruiser EFI/MPI

Coolant Temp Sensor 805218T – MerCruiser EFI/MPI

$55.77
Descripción

How to Match This Part

This aftermarket engine coolant temperature sensor replaces Mercury MerCruiser / Quicksilver 805218T (and the earlier number 805218). It is a threaded, two-wire coolant-temperature gauge sender for MerCruiser EFI / MPI sterndrive and inboard engines that need coolant-temperature feedback at the helm gauge or monitoring circuit.

Match this part in this order:
1. OEM or aftermarket number on the removed sensor — 805218T / 805218, Sierra 18-7600, or Mallory 9-42402
2. Engine family and serial — MerCruiser MCM / MIE EFI and MPI applications that call for 805218T in the parts diagram (including verified 4.3L MPI, 350 MAG MPI, 5.0L MPI, and MX 6.2L MPI serial bands below)
3. Physical form — threaded probe-style body with hex flats, molded two-wire plug, and the mating pigtail shown in the product images

Compare thread, probe length, and connector shape with the original part and the product images before ordering. Do not confuse this coolant-temperature sender with MerCruiser intake-air (IAT) sensors such as 805223T — those are separate listings.

Part Number Cross-Reference

Use these verified numbers to confirm you have the correct coolant temperature sensor. Brand names and OEM numbers are for identification only.

Type Brand Part Number Notes
OEM Mercury MerCruiser / Quicksilver 805218T Primary reference — coolant temperature gauge sender
OEM Mercury MerCruiser 805218 Earlier number; functionally replaced by 805218T
Aftermarket Sierra Marine 18-7600 Direct cross-reference for MCM / MIE EFI
Aftermarket Mallory Marine 9-42402 Direct cross-reference

This is an aftermarket part manufactured by JLM Marine. It is not sold as a genuine Mercury, MerCruiser, or Quicksilver component.

Compatible Engine Models

Confirm your engine before ordering. Serial location guide: Mercury Parts Diagrams. Always match the OEM number and physical form of the sensor you remove. On verified MerCruiser 4.3L MPI applications, this sensor mounts in the thermostat-housing assembly.

Brand Engine Model Serial Number Range Notes
MerCruiser 4.3L MPI Alpha / Bravo 0M300000–0M614999 805218T shown in thermostat-housing diagram
MerCruiser 350 MAG MPI Alpha / Bravo & Horizon Alpha / Bravo 0M300000–0M599999 Where-used for 805218 → 805218T
MerCruiser 5.0L MPI Alpha / Bravo 0M300000–0M599999 Where-used for 805218 → 805218T
MerCruiser MX 6.2L MPI Bravo & Horizon Bravo 0M300000–0M599999 Where-used for 805218 → 805218T
MerCruiser 350 MAG MPI MIE / Horizon MIE 0M310000–0W389999 (banded) Confirm serial band on engine ID plate
MerCruiser MX 6.2L MPI MIE / Horizon MIE 0M310000–0W389999 (banded) Confirm serial band on engine ID plate
MerCruiser 383 MAG Stroker Inboard 1G300000 & Up Where-used for 805218 → 805218T

Mercury also specifies this sender for MerCruiser EFI sterndrive and inboard applications generally. If your serial range is outside the rows above, order only when the engine parts diagram or the removed sensor shows 805218T / 805218.

Technical Specifications

Specification Value
Part type Engine coolant temperature gauge sender / sensor
Primary OEM 805218T (replaces 805218)
Electrical connection 2-wire plug-in with mating pigtail (as shown)
Body form Threaded probe with hex wrench flats
Verified MerCruiser mount Thermostat housing (4.3L MPI diagram)
Application class MerCruiser EFI / MPI sterndrive and inboard (MCM / MIE)

Package Contents

  • 1 × threaded engine coolant temperature sensor
  • 1 × two-wire mating connector pigtail, as shown in the product images

Reuse or replace any engine-side sealing compounds or retainers only as specified in the applicable MerCruiser service manual.

Installation Guide

  1. 1 Allow the engine to cool completely. Disconnect the negative battery cable and relieve cooling-system pressure per the service manual.
  2. 2 Locate the existing coolant temperature sensor. On verified MerCruiser 4.3L MPI applications it is installed in the thermostat-housing assembly.
  3. 3 Release the electrical connector without pulling on the wires. If the supplied pigtail is required, splice only with marine-grade sealed connections and preserve original circuit positions.
  4. 4 Remove the old sensor and compare part number, thread, probe length, and connector shape with the replacement before installation.
  5. 5 Install the replacement using the tightening method and torque in your MerCruiser service manual. Do not overtighten into aluminum bosses or allow sealant to cover the sensing tip.
  6. 6 Reconnect wiring and battery, restore coolant as required, inspect for leaks, and verify a plausible temperature reading as the engine warms.

Note: Professional installation is recommended for EFI / MPI coolant-temperature sensors.

Troubleshooting & FAQ

How do I confirm this fits my MerCruiser? +

Read the number on your existing sensor first. If it is 805218T, 805218, Sierra 18-7600, or Mallory 9-42402, this is the correct coolant-temperature replacement for the MerCruiser EFI / MPI applications listed above. Then verify serial range in the parts diagram and compare the connector with the product images.

Is this the same as an intake air temperature (IAT) sensor? +

No. This listing is an engine coolant temperature gauge sender for the cooling system. MerCruiser IAT / air-charge sensors (for example 805223T) mount in the intake-air path and use different part numbers — order the listing that matches the number on your removed sensor.

Why does my diagram also show a separate temperature sender? +

Some EFI / MPI thermostat-housing diagrams list both this two-wire sensor and a separate one-wire or stud-terminal sender for related circuits. Do not substitute one for the other; order by the exact part number shown for your serial range.

Is this an OEM or aftermarket part? +

This is an aftermarket replacement manufactured by JLM Marine. It is not a genuine Mercury, MerCruiser, or Quicksilver part. OEM and aftermarket numbers are listed only for cross-matching.

What should I check if the temperature reading is still incorrect? +

Inspect the two-wire connector, sealed splices, engine ground, coolant level, thermostat operation, and related harness faults. Use the MerCruiser service manual for circuit tests; do not diagnose the sensor from appearance alone.

Why Choose JLM MARINE?

  • Precision Fit: Cross-referenced to Mercury MerCruiser / Quicksilver 805218T for the MerCruiser EFI / MPI applications listed above.
  • Quality Control: Each batch is inspected for dimensional consistency and workmanship.
  • Direct from Manufacturer: Aftermarket marine sensors engineered for reliable coolant-temperature feedback on MerCruiser EFI / MPI systems.
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Para nuestros clientes típicos de EE. UU. y Canadá , nuestros plazos de envío son los siguientes:

  • Amazon FBA : los pedidos se entregarán dentro de 1-5 días hábiles después de realizar el pedido (durante ciertos períodos especiales como promociones importantes, Navidad, etc., el tiempo de entrega de Amazon FBA puede verse afectado).
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Acerca de JLM Marine

Fundada en 2002, JLM Marine se ha consolidado como un fabricante dedicado de piezas marinas de alta calidad, con sede en China. Nuestro compromiso con la excelencia en la fabricación nos ha ganado la confianza de las principales marcas marinas a nivel mundial.

Como proveedor directo, evitamos intermediarios, lo que nos permite ofrecer precios competitivos sin comprometer la calidad. Este enfoque no solo promueve la rentabilidad, sino que también garantiza que nuestros clientes reciban el mejor valor directamente del proveedor.

Estamos entusiasmados de ampliar nuestro alcance a través de canales minoristas, llevando nuestra experiencia y compromiso con la calidad directamente a los propietarios de embarcaciones y entusiastas de todo el mundo.

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