Let's see...it was 'running fine' for a half hour with the temp guage
not even registering.....
I don't know about you, but I would certainly not be motoring around in
a boat that just had the water pump replaced if the temp guage wasn't
working.
Then...'it shot up to 240° and blew up'.
HMMMM, I just don't buy it. Sounds like a troll.
JR

Fred Dehl wrote:
Got a Monterey 27' with a 7.4L Mercruiser. Raw water cooled. Couple of
weeks ago I had the fuel pump and water pump replaced. Second time
running it out after that repair, it was running just fine for a half hour
at cruising speed and then almost instantly it overheated (from not even
registering on the temp gauge to 240 degrees) and shut down. A little bit
of smoke from underneath the flame arrestor. Oil was full, and not milky.

Got a tow back to the marina and their shop (who I've been using for
maintenance & repairs) tell me the block's cracked.

Everyone talks about blocks cracking from freezing, but here it is running
fine and then - bam, hot and dead.

What are the most common causes of cracked blocks, and might the shop have
screwed something up on the water pump job?

tia

FD


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