Overheating engine

[beamie]

Originally Posted by Adam_777

Got a pressure tester ? From my end coolant in the exhaust is never a good thing.Heat exchangers when they get warm can crack and when they crack coolant does leak into the exhaust.I see this on newer emissions diesel engines with EGR when they use coolant to cool the exhaust gasses before recirculating.I am not sure the purpose of a heat exchanger on a boat.I would take off the exhaust intake and exhaust outlet of the heat exchanger.Leave the coolant lines attached and pressurize the system.The water will leak out of the exchanger if it is the suspect.Not knowing the type of engine and configuration this diagnosis could be way off.I have also seen exchangers that wouldn't leak when they were cold but once warmed up would start leaking.I am not sure what an elbow gasket is on that engine.Maybe if your smelling coolant burning on your exhaust it could be a gasket above your manifolds like a t-stat gasket or elbow gasket.Sorry I couldn't be of much help.

Adam, your thinking all bassackwards....... heat exchanger has nothing to do with exhaust. Saltwater to Antifreeze

[Adam_777]

Originally Posted by beamie

Adam, your thinking all bassackwards....... heat exchanger has nothing to do with exhaust. Saltwater to Antifreeze

I work on diesel engines and am not familiar with marine engines.I just did a little research.I wouldn't suspect the exchanger first.Seems like risers and manifolds have a short life span depending on the environment.When I see coolant in the exhaust of an EGR diesel it is usually the exchanger but this is a different animal.