Brian Currier

This one’s for you, diesel engine guru’s. I have a Yanmar 4jh3e that’s been overheating and overflowing coolant from the expansion tank. Here’s what I’ve replaced/ serviced: -raw water impeller -freshwater/ coolant pump -coolant pump t-stat -heat exchanger cap -removed and cleaned heat exchanger (did not pressure test) -flushed and burped coolant through system -exhaust elbow removed/ cleaned -exhaust hose replaced (partially collapsed) Am I missing something aside from this being a head gasket? No obvious contamination in oil or coolant.