Possible bad stuck thermostat ?

[Mark Glaubke]

The starboard motor temp under cruise load runs a steady 185 to 190 at trolling speed it drops to about 110. Thermostat stuck? 6BTA engine only have 5 hours. It was doing this at engine start up

Topic

[Francis Valerio]

I dont know the actual measurement but it will be a good amount of antifreeze to do it so be prepared to drain most of it. The thermostat housing is not that high compared to the expansion tank which is located above it.

Expansion tank holds over 2 gallons (depending what model)

[Mark Glaubke]

Thank you Rob. Question how much antifreeze do I have to drain?

[Rob Schepis]

Check this out: https://www.sbmar.com/articles/changing-the-cummins-marine-thermostat/

[Rob Schepis]

Yes, I would.

[Mark Glaubke]

Rob, I’m kind of new to all this port motor stays around 180. Should i change out the thermostat on the starboard side that drops to 110 ?

[Rob Schepis]

Yes, that is possible.

[Mark Glaubke]

help anyone please

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