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Old 11-15-2020, 10:51 PM
yeahmag yeahmag is offline
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Chaotic Engine Temps

I recently changed out a head gasket due to failure and rebuilt the carb as a result. I also did an acid flush and added the MM thermostat (late engine) and now finally have temperature showing on my gauge. What's concerning, is the temperature fluctuates all over the place. It will swing from 160F to 200F or more. Sometimes settling at 180F for a bit before going all over the place again. I have a good flow of water out the back and when it was "hot" I reached over the stern and felt it. I'd say "warm" at best. Motor runs great. Plenty of power and doesn't miss a beat. The motor is raw water cooled and in Southern California. It gets a fresh water flush after every outing.

I'm thinking I have one of two issues. The sender or gauge is failing or I need a restriction in the recirculation line from the thermostat.

Has anybody experienced this before?

Thanks!

-Aaron
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