I have a 1993 200hp mercury blackmax engine that keeps running hot when I push it full throttle and run it. I get it up on a plain and the temp gradually goes up and the alarm sounds. I have changed the water impeller and diaphragm for the poppit valve. The valve itself was fine. I also flushed the block and hoses with water. Any other ideas for what could be making it do this??|||Now you got me.. I was sure it was the poppit..
Pull the thermostats... check the hose between them for blockage... test run it without the stats.
Two other things:
head gasket.
Water in the gas
In general high RPM over heat ( I bet it happens only under load ) is a water volume issue.
as the motor, / water heats up / builds pressure you need more volume to cool the motor... this is what the poppit does opens under pressure... Take a really good look at the poppit assy.. make sure the water has some place to go..... I've had this issue on bothe my moters at one time or another ( twin 150's 1995's )
it's a pain in the #$$%... I run offshore and after sitting in the slip for a bit small salt deposits built up in the poppit housing....
You might want to check you spark plugs as well... it may give you an idea if you have a leak in the head gasket... hope this helps..... I feel you pain! BOAT!!@!
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