Ok guys the sage continues.
I'm still overheating
, took it out today under load at 1700 rpm
, white smoke started, I had a lazier heat sensor, the exhaust
manifold was 190, the exhaust elbow
I up the engine
to 2500 the temps rose to 205/170 respectively, then the alarm started.
I idled down to 1000rpm, after 10 minutes alarm stopped and I babied it back to the mooring
This is starting to be a real PIA.
I removed the exhaust elbow
, didn't look all that bad there was lumps and bumps of corrosion
but was clear, I put some probes thru and they went fine.
I put a hose thu it when the raw water
enters the the jacket it flowed with no issue.
I'm thinking since it's off to have a radiator shop boil it to clean it up.
Now I'm thinking tomorrow to remove the water
pump and thermostat.
The exhaust muffler
was clear but evidence of prior over heating
Another wild idea is the exhaust hose going aft has junk in it but I doubt it.
I'm leaning to a stuck thermostat.