All the previous suggestions for checking the cooling
system are sound but one I've run into on past boats is the size of the through hull
and connecting plumbing
to the water
pump. In both cases the engine
had been retrofitted when the original was replaced. The last one was a C&C
38 that had been refitted with a 30 hp Yanmar
, after exhausting all the other possible causes I replaced the through hull
with the next size up and plumbed the connecting plumbing
to my raw water pump
to optimize flow. The difference was instantly noticeable, I was able to run almost 1000 rpm
higher with no cooling
issues, I would suggest this option only after doing the previously suggested fixes.
Is the engine
in your Cal
the original or was it a re-power?