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Old 02 May 2007, 11:40   #1
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Country: UK - Scotland
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Make: humber
Length: 6m +
Engine: optimax 150
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Optimax 150 overheat

I have an optimax 150 it overheats when i go above 2000 rpm. the tell tale looks ok any suggestions
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Old 02 May 2007, 12:03   #2
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You should check (and replace) the thermostats first - are they opening?
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Old 05 May 2007, 17:06   #3
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Do you have water Pressure gauges on your boat? Check them if you do, Also when did it last have a water pump. The tell tale is not always a good indicator. The other thing is the pressure relief valve in the block if its not opening it wont let the water through properly.
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