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Old 04-27-2020, 12:19 PM
Admirals Club Admiral's Club Member
Join Date: Sep 2019
Location: NE FL
Posts: 708
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Default De-scaling OX66 200

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?