jimcleary
James M. Cleary
Last season and this my Yanmar 3QM30F has been putting out white smoke/steam with the exhaust. I have done numerous fixes to cure the problem. New injectors, new mixing elbow, New impeller, new thermostat, cored out the heat exchanger, insured all the salt water side hoses are clear. With these fixes the amount of the smoke/steam has been reduced but not eliminated. This past weekend I put an air pressure test on the waterside of the exhaust manifold. In 10 minutes time the air pressure dropped 20 lbs. So I'm thinking there is a small crack in the manifold. The fresh water side coolant level has not dropped and the coolant appears nice and clean. The engine oil is at the proper level and is the proper color. Before I spend $900 for a new exhaust manifold, I want to explore all options. Would anyone have any suggestions as to what else I can look for?
Jim
Jim