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This thermostat is a direct replacement for Yanmar marine engines – specifically the 4LH, 4LHA, and 4TNV98 models.
It replaces OEM part numbers 121850-49811 and 121850-49810, so you know it's the right fit for your setup.

If your engine's running hot or the temperature gauge is acting wonky, chances are the thermostat needs swapping out.

Install is straightforward – no manual needed if you've got basic mechanical skills.



Whether you're a commercial fisherman or a weekend boater, having a spare thermostat on board is smart.


