Quote:
Originally Posted by Al Schober
Tough to tell whether you have an engine issue or a heat exchanger issue.
First thing I'd do is remove the thermostat and leave it out until you get the overheating under control. See what happens without the thermostat. If you have a bypass valve, close it. If not, plug the bypass hose.
If still running hot, I think I'd convert back to raw water cooling temporarily. If this runs cool, then you have a heat exchanger issue. Remove and clean.
If still runs hot with raw water, then it's an engine issue and you'll have to find the blockage.
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Thanks for the alternative steps in diagnosis... I have run it without the thermostat climbs to 160 and holds... I didn't push the engine past that.
I'm beginning or shall I say hoping the problem is in the manifold. I really don't want to tear the head apart if I can help it.