> That makes sense as a coolant leak would increase as the cylinder pressures go up.
As I understand, that would mean the coolant level going down? I did not add any coolant for the 300+ hours we put on the engine this summer and it seems to be the same level and pink color as when we started so hopefully this is not the case.
I'm planning to do the compression test anyway.
as I can see from the replies, the most likely causes:
- i'm over propped or
- partially plugged exhaust elbow
i guess the compression test and disassembling the exhaust for inspection will confirm or deny this.
> If the engine is in good condition (good compression) my first guess it's over propped.
What would be my options if I'm over propped? Getting a new prop or ignore? at 1700 RPM the boat is doing 7.5 knots fully loaded, the engine is happy and the fuel consumption is relatively low (2GPH). maybe it was done on purpose for some reason and I should not worry about this because it worked fine for 30 years?
Thank you
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