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Old 07-29-2020, 01:19 AM
outoftheblue outoftheblue is offline
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Maybe the gears?

Hi everyone, this is my first request for help here!

I have a 1967 CAL 36 sailboat with an A4.

Engine runs great....in idle even at high RPM (2000) forever.

I've been having a unique issue for the last few years.

When I engage the transmission and raise the RPM to about 1500, it runs great with good power but in about a minute (every time) the RPM starts slowly dropping and if I let it, it will stall.
I can pull the throttle to keep it going until the end of the range of the cable and it will stall...but slowly, gradually.

What i have done so far:
Replaced the carburetor, installed electric fuel pump, new fuel filter and water separator,thermostat, checked fuel hose, tank vent, compression check,
plugs, points....checked the exhaust for restriction and more.
None of the above changes made any difference, it has been stalling the same way, again, slowly, gradually in gear at higher RPM.

From the beginning I had a feeling it might be the trans or the V drive but don't know how to test that?
The shaft was pulled out and the stuffing box and bushings rebuilt but that mad no difference either?

I had mechanics check it out but eventually they leave without having an idea of how to solve this mystery!

I am very curious what I have missed or how I can move forward?
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