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Old 07-04-2013
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Universal M20 overheats when in gear, not getting full power

Headed out of the marina in our Oday 30 this morning, and the diesel engine (M20. Universal) started to overheat when accelerating and we couldn't get full acceleration when in gear (but could in neutral). Raw water is coming in freely, exhaust looks good, filter had jelly fish, so we flushed it several times. Doesn't overheat in neutral at any RPM, only with load.

What should we check next?
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Old 07-05-2013
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Re: Universal M20 overheats when in gear, not getting full power

Lack of normal acceleration sounds like maybe your prop is a bit fouled.

As far as the overheating, if you have a heat exchanger (HX) hooked up to your engine's cooling system I'd try cleaning that out 1st. Also change the zinc in the HX (read this link).
Autopsy A Westerbeke / Universal Marine Heat Exchanger Photo Gallery by Compass Marine at pbase.com

Check the impeller on the water pump as well.

If your engine is raw water cooled you can suck a gallon of white vinegar into it and leave it overnight. This can help clean up the cooling passages in the engine block.
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Re: Universal M20 overheats when in gear, not getting full power

Excessive load on the engine. Prop, Prop shaft, or transmission.
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Re: Universal M20 overheats when in gear, not getting full power

Dove under the boat and found 1/4" of buildup on the prop and shaft. Scraped it off and will try the motor again tomorrow morning. Will definitely look for different bottom paint for the prop next season.

Thank you for your suggestions, will report back.
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Re: Universal M20 overheats when in gear, not getting full power

It takes only a surprisingly little amount of growth on a 2 blade prop to foul it.
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Re: Universal M20 overheats when in gear, not getting full power

And if it sits for anytime at all, it will get buildup.
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