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Mercruiser 165 chirp from exhaust

BradleyD

New member
I bought a 25 Bertram about three months ago with twin 165 Mercruisers as a project boat. Both engines run great but the starboard engine has a slight chirp/squeak that I've narrowed down to be coming from the exhaust. My first impression when I bought the boat was a belt, then a gimbal bearing when hearing at the rear of the engine, but now have the drives off so could not be the bearing. About 40 hours have been put on the engines since I got the boat with no change for worse or better. Compression is within 10psi of each cylinder and oil pressure 25-30 psi at idle, 35-40psi at 2k rpm's. Anyone know what could be causing the noise because I'm a little stumped at this point? I'm in the process of unrigging everything, but want to find any significant problems now cause once I pull the rigging it will be months before it gets hooked back up and can have something repaired in that time. Thanks for any help!

Brad
 
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