Coolant Temp Alarm Switch 127610-91350 – Fits Yanmar 2GM–6LY

How to Match This Part

This aftermarket coolant temperature alarm switch replaces Yanmar 127610-91350. It is a 95°C (203°F) switch for the engine alarm circuit on listed Yanmar marine diesel engines with freshwater / heat-exchanger cooling — not a variable sender for a dashboard temperature gauge.

Match this part in this order:
1. OEM number on the removed switch or in your parts catalog — Yanmar 127610-91350 (Recmar cross REC127610-91350)
2. Engine model code — on the engine identification plate (typically on the block or flywheel housing)
3. Cooling configuration — this 95°C switch is for freshwater / heat-exchanger cooled applications; raw-water cooled GM/HM engines often use a different lower-temperature switch
4. Physical form — threaded body with a single stud terminal (compare with the product images)

Do not order from engine family alone. Confirm 127610-91350 (or REC127610-91350), cooling type, and the physical switch against the removed part before installation.

• Primary OEM: 127610-91350
• Type: Coolant temperature alarm switch
• Switch point: 95°C (203°F)

Part Number Cross-Reference

Use these references to confirm interchange. Recmar REC127610-91350 is an aftermarket replacement for Yanmar 127610-91350.

Compatible Engine Models

Confirm your Yanmar model on the engine identification plate. Match OEM 127610-91350 and the physical switch form to the product images before purchase. Coverage below is limited to verified model codes for this listing. On GM/HM families, confirm freshwater / heat-exchanger cooling — raw-water installations often require a different switch.

Technical Specifications

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. Catch residual coolant and keep the port clean.
4. Compare the replacement to the original: OEM 127610-91350, 95°C alarm function, and single stud terminal.
5. Install using the sealing method and tightening procedure in your Yanmar service manual. Reconnect the terminal securely.
6. Refill and bleed 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 95°C temperature alarm switch. It is not the variable sender used to drive an analog temperature gauge.

My catalog shows Recmar REC127610-91350 — is that the same?
Yes. REC127610-91350 is the Recmar aftermarket cross for Yanmar 127610-91350. Still verify cooling type and physical form against the removed switch.

Does every 2GM or 6LY use this switch?
No. Publish coverage is limited to the model codes in the compatibility table that call for 127610-91350. Confirm freshwater / heat-exchanger cooling on GM/HM families, and match the OEM number and physical form; do not order by series name alone.

Why Choose JLM MARINE?

• Precision Fit: Form and function intended for Yanmar 127610-91350 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.