Art.
A few things you can check.
1. Check oil for water on dipstick...this might alert you to a head gasket leak.
2. The raw water pump: If you seem to be getting the same amount of water ejection as prior to the incident you impeller might be OK...I'd replace it or at the very least check it. Regarding the pump...I wonder how much the seals heated up on the shaft as well, but again, if no water in oil you should be OK...you can get water in oil from a failed inner shaft seal on the raw water pump. This generally occurs after years of use though...but something to keep an eye on.
3. Check for steam out the exhaust. This again, even if no water in oil, might indicate a head gasket leak. A bit of steam on start up on cool days, ambient cool outside temp with warm moist exhaust exiting the boat is considered normal...but keep an eye for that consistent cloud that doesn't disperse after a few feet.
4. If it sounds normal at low rpm and doesn't knock coming up in RPM I think you are fine. Watch and see what your Oil Pressure gauge is doing. Give it a rev....pressure comes up, you have bearings. No pressure increase, worn bearings...simple stuff.
5. A thumping under load....I'm thinking prop related, cavitation etc...but Id have to hear it.
6. If there is anyway you could post a video of it I'm sure a few of us could offer more suggestions.
__________________
Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
Last edited by Mo; 09-09-2021 at 09:50 AM.
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