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Paul Cassel

wrote:
Paul Cassel wrote:
wrote:
Just bought my first boat.
Rusty thermostat implies no coolant / protectant which would further
imply a cracked block. You may also have blown rings or valve guides/seals.

How would one use coolant/protectant on an open system? It uses
riverwater as coolant. Am I missing something? Wow this boating stuff
is more involved than I could have thought. I did a compression check
and that is fine. 175-165 so I think that lets out a head gasket. I
fired it up after changing the oil and ran it for 30 min and then
checked the oil and its fine. Something weird has happened or something
I did caused this to happen I think. Someone said something about a
flapper in the exhaust if stuck could see this when launching the boat
and when coming off plane too quick (as I do). Any suggestions?

OK, do you mean a total loss system? If so, then you can't use coolant.
I've never encountered a total loss cooling system so I'm out of this one.

If the seller, a dealer, said the engine was in good shape, why not just
demand that he address the issue?