We were testing our recently rebuilt GM 366 Targetmaster engine in the chipper truck. All was going well; engine sounded good, running smooth, no problems. Oil pressure, water pressure ok. This engine has rebuilt heads, a used block with everything mic'ed, new pistons, new gaskets...I don't think we cut any corners except by using used parts.
After about 30 minutes of using the knuckleboom crane to re-attach the outrigger, it blew off a radiator hose, splattering oil & water mix all over the engine compartment. The oil was still clean.
I went diagnostic, restarted the machine. Huge globs of oil/water were continuing to rise up out of the radiator in a solid stream, even with a garden hose flushing the oil out as it came up. After shutting it down, the oil had been converted to the same oil & water sludge that was coming out of the radiator.
The engine still sounds fine. Running like a champ.
We took the heads off today, but I cannot find any signs of where the mixing was occurring. I looked REAL close at the head gaskets, but cannot find a thing.
I figure this is the only way that so much oil could be injected into the radiator: it would have to be connected to an oil passage that was under direct pressure from the oil pump. Does anybody have a clue as to where/how oil could be injected into the water jacket under pressure?
After about 30 minutes of using the knuckleboom crane to re-attach the outrigger, it blew off a radiator hose, splattering oil & water mix all over the engine compartment. The oil was still clean.
I went diagnostic, restarted the machine. Huge globs of oil/water were continuing to rise up out of the radiator in a solid stream, even with a garden hose flushing the oil out as it came up. After shutting it down, the oil had been converted to the same oil & water sludge that was coming out of the radiator.
The engine still sounds fine. Running like a champ.
We took the heads off today, but I cannot find any signs of where the mixing was occurring. I looked REAL close at the head gaskets, but cannot find a thing.
I figure this is the only way that so much oil could be injected into the radiator: it would have to be connected to an oil passage that was under direct pressure from the oil pump. Does anybody have a clue as to where/how oil could be injected into the water jacket under pressure?