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Is the engine actually running hot? Have you taken the temps of the cylinder heads to see if it's running hot or not?
Hi Ted. If you do no have a pyrometer, what makes you say the alarm is for temp and not something else? What kind of indicator are you getting that it is for temp?
I understand. In the shop what I would do is pull the engine cover, and duplicate the problem. Once the alarm goes off, I would scan the tops of the cylinder heads with a pyrometer. If the engine is running normal, about 160F or so, then one of the temp sensor is bad and activating prematurely. From there I would test the temp sensors, and replace the bad one. If it is running hot, over 190 F or more. Then a compression test and possibly a leakdown test is in order to check for a bad head gasket. If the head gaskets appear to be good, then I would drop the lower unit again, pull the themostats out, flush the block out with a garden hose. And go back through the impeller to make sure it was done correctly, and that all gaskets and seals are in place, and check to make sure the pump cover isn't warped or cracked. Does that all make sense?
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