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Old 04-27-2020, 01:34 PM
Shore Native
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Join Date: Aug 2012
Location: Easton, MD
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Originally Posted by Lifeislarge View Post
I have a 2001 OX66 200 and the temperature alarm is going off anytime I cruise over 4000 RPM. Done a pretty thorough search and it appears the heads are probably caked with scale. Has anyone had any luck pulling the thermostats and filling the heads with de-scaler from the top or should I just bite the bullet and pull the heads? Just figured if I could somehow circulate a chemical with a pump and a basin going from the top it might work. If I do end up pulling the heads are there any tips and tricks that won't be in the manual?

Some threads on here - just have to search - on using vinegar to flush.

Here you go....How to: Cleaning your cooling system with vinegar