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Old     (CenCalLakes)      Join Date: May 2014       07-08-2015, 5:45 PM Reply   
'89 Ski Brendella with a PCM 351 Ford raw water cooled.

-last weekend running on the lake engine started to overheat.

on the water I let it cool and replaced the impeller on the sherwood raw water pump even though it seemed fine. I had one on the boat and figured it wouldn't hurt. Checked the screen under the boat and the screen on the oil cooler everything looked clean.

It was close to the end of the day so we headed back to the ramp, engine was running around 165 which I feel was fine but it is about 10 degrees warmer than it usually runs. I did at one point think I heard a strange humming sound coming from the re-circulating pump.

I changed the thermastat 'cause the local PCM dealer had one on the rack.

Ran it today with the fack-o-lake and it started to creep up again, i shut it down at about 200 degrees

I was getting plenty of water out the exhaust and water seems to be flowing well.

I just ordered a re-circulation pump overnight shipping b/c we want to be out on the lake this weekend.

Anyone have any other ideas what the overheat problem could be coming from?

I am the kind of person that likes to cover all my basis because I would rather spend the money now and just replace the old stuff before I get stranded on the water.

Thanks for the input and thoughts ahead of time.


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