I have a 87' Mercruiser V6/175HP. The previous owner did not drain the water from the exhaust manifolds and both sides cracked when the water froze. I replaced the manifolds and the engine runs fine with no water leaks on the engine. When I put the boat in the water I discovered water coming in through the transom around the top area where the motor connects to the outside drive. The exhaust is not coming out through the prop as I thought it should, but near the transom. What do you think is leaking...... the exhaust bellows? What will it take to fix the leak?
Make (of engine): 4.3L Chevrolet
Model (of engine): 87' Mercruiser V6/175HP.
Hello, welcome to JustAnswer. because of the range of possible issues, this may take more than one post. Please, don't hesitate to reply.
The water coming into the boat is coming in thru a damaged U-joint bellows on the transom assembly.
The exhaust is coming out of the exhaust relief holes in the transom. That is perfectly normal. It makes starting the boat easier and allows it to idle at a lower, smoother rpm.
To replace that bellows the drive needs to come off and the transom assembly needs to be partially dismantled. (the drive bell needs to be taken loose from the gimble ring)
12 years Certified marine mechanic, performance boat builder