Yanmar 2QM20 Thermostat swap - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 12-30-2013
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Yanmar 2QM20 Thermostat swap

I have a 2QM20 that was switched over to FWC from Raw Cooled. My problem is that my thermostat appears to be the original and opens at 120 degrees. I would like to get the temp higher by putting a higher opening temp thermostat. Does anyone know if there is a thermostat I can swap out or am I just stuck with the original? It seems to have been this way for years. Thanks.
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Old 12-30-2013
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Re: Yanmar 2QM20 Thermostat swap

Should be one. The fresh water cooled Yanmars have the same thermostat housing I believe. Check with a Yanmar dealer.
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Old 12-31-2013
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Re: Yanmar 2QM20 Thermostat swap

Take old thermostat to an auto parts store and match one up. Shouldn't be a problem.
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Old 01-01-2014
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Re: Yanmar 2QM20 Thermostat swap

Checking the manual here:

http://www.dieselpartseurope.com/web...vicemanual.pdf

Raw water thermostat opens at 41deg C / fresh water thermostat opens at 72degC.
So yes there is an alternative thermostat.
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Re: Yanmar 2QM20 Thermostat swap

As posted any auto parts store should have one. No reason to pay Yanmar prices for an item they don't make anyway.
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Old 01-01-2014
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Re: Yanmar 2QM20 Thermostat swap

Heres a source for a FWC thermostat for your 2QM. http://www.marinedieseldirect.com/ya.../thermostat.ph

Yanmar uses 'wax filled' T'stats unlike 'automotive' T'stats which use a 'bi-metalic spring' system. The 2QM and 3QM T'stat for raw cooled opens fully at about 120°F, the FWC opens fully at ~160°F.
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