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??My mercury blackmax is still running hot at high RPM'S!?
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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