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Coolant Temp Alarm Switch 128275-91340 – Fits Yanmar 1GM–3HM

Coolant Temp Alarm Switch 128275-91340 – Fits Yanmar 1GM–3HM

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

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Coolant Temp Alarm Switch 128275-91340 – Fits Yanmar 1GM–3HM

Coolant Temp Alarm Switch 128275-91340 – Fits Yanmar 1GM–3HM

$55.77
Descripción

How to Match This Part

This aftermarket coolant temperature alarm switch replaces Yanmar 128275-91340. It is a 65°C (149°F) switch for the engine alarm circuit on listed Yanmar GM and HM marine diesels with direct raw-water cooling — not a variable sender for a dashboard temperature gauge, and not the 95°C freshwater / heat-exchanger switch used on other GM/HM installations.

Match this part in this order:
1. OEM number on the removed switch or in your parts catalog — Yanmar 128275-91340 (Recmar cross REC128275-91340)
2. Engine model code — on the engine identification plate (typically on the block or flywheel housing)
3. Cooling configuration — this 65°C switch is for direct raw-water cooled applications; freshwater / heat-exchanger cooled GM/HM engines often use a different higher-temperature switch
4. Physical form — threaded metal body with hex wrench flats, white insulated top, and a single stud terminal (compare with the product images)

Do not order from engine family alone. Confirm 128275-91340 (or REC128275-91340), raw-water cooling, and the physical switch against the removed part before installation.

  • Primary OEM: 128275-91340
  • Type: Coolant temperature alarm switch
  • Switch point: 65°C (149°F)

Part Number Cross-Reference

Use these references to confirm interchange. Recmar REC128275-91340 is an aftermarket replacement for Yanmar 128275-91340.

Type Brand Part Number Notes
OEM Yanmar 128275-91340 Primary SWITCH, 65 reference
Aftermarket Recmar REC128275-91340 Aftermarket replacement for 128275-91340

Compatible Engine Models

Confirm your Yanmar model on the engine identification plate. Match OEM 128275-91340 and the physical switch form to the product images before purchase. Coverage below is limited to verified model codes for this listing. These applications are for direct raw-water cooled GM/HM engines — freshwater / heat-exchanger installations typically require a different switch.

Brand Engine Series Compatible Model Codes
Yanmar 1GM 1GM, 1GML, 1GMY-C, 1GM10
Yanmar 2GM 2GM, 2GMLP, 2GMSZK, 2GM20, 2GM20-YEU
Yanmar 3GM 3GM30
Yanmar 3HM 3HM, 3HM35

Technical Specifications

Specification Value
Part type Coolant temperature alarm switch
Primary OEM 128275-91340
Switch point 65°C (149°F)
Function Alarm circuit switch (not a gauge sender)
Electrical connection Single stud terminal
Cooling application Direct raw-water cooled engines
Application Listed Yanmar marine diesel alarm systems calling for 128275-91340

Installation Guide

  1. Allow the engine to cool completely. Isolate battery power before opening the cooling circuit.
  2. Locate the original temperature alarm switch. Note wire routing and terminal orientation.
  3. Disconnect the lead, then unscrew the switch using the hex body. Catch residual coolant and keep the port clean.
  4. Compare the replacement to the original: OEM 128275-91340, 65°C alarm function, white insulated top, and single stud terminal.
  5. Install using the sealing method and tightening procedure in your Yanmar service manual. Do not apply force to the white insulator. Reconnect the terminal securely.
  6. Restore coolant as required, restore power, run the engine, and check for leaks plus normal alarm-circuit operation.

Gaskets, sealing washers, sealant, and coolant are not identified as included with this listing. Reuse or renew the original sealing arrangement only as your service manual requires.

Troubleshooting & FAQ

Is this a genuine Yanmar part?
No. This is an aftermarket replacement manufactured to match the OEM-reference fit and function. It is not an OEM or factory Yanmar part.

Is this the alarm switch or the gauge sender?
It is the 65°C temperature alarm switch. It is not the variable sender used to drive an analog temperature gauge.

My catalog shows Recmar REC128275-91340 — is that the same?
Yes. REC128275-91340 is the Recmar aftermarket cross for Yanmar 128275-91340. Still verify raw-water cooling and physical form against the removed switch.

Is this the same as the 95°C Yanmar switch?
No. Yanmar 127610-91350 is a different 95°C switch typically used on freshwater / heat-exchanger cooled applications. This listing is only for 128275-91340 at 65°C.

Does every GM or HM use this switch?
No. Publish coverage is limited to the model codes in the compatibility table that call for 128275-91340 on direct raw-water cooling. Confirm cooling type, OEM number, and physical form; do not order by series name alone.

Why Choose JLM MARINE?

  • Precision Fit: Form and function intended for Yanmar 128275-91340 coolant temperature alarm switch applications on the listed marine diesels.
  • Quality Control: Each batch is inspected for dimensional consistency and workmanship.
  • Direct from Manufacturer: Aftermarket marine sensors engineered as direct replacements — not remanufactured cores.
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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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