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Old 02 May 2007, 10:40   #1
Country: UK - Scotland
Town: Glasgow
Make: humber
Length: 6m +
Engine: optimax 150
Join Date: May 2007
Posts: 70
Optimax 150 overheat

I have an optimax 150 it overheats when i go above 2000 rpm. the tell tale looks ok any suggestions

iainmartins is offline   Reply With Quote
Old 02 May 2007, 11:03   #2
Country: UK - England
Length: no boat
Join Date: Aug 2006
Posts: 15
You should check (and replace) the thermostats first - are they opening?

spence is offline   Reply With Quote
Old 05 May 2007, 16:06   #3
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,335
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.
Turbodiesel is offline   Reply With Quote

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