Posted by chadd on July 16, 2008 at 20:05:34 from (4.142.219.213):
Our M started running on only two cylinders the other week. It has the kerosene head on it and has 88 psi of pressure in each cylinder except cylinder 3, which has 62 psi. I decided to determine where the leakage was coming from, so I got a tube and filled the cylinders with 50 psi of compressed air with each cylinder at TDC. Each cylinder leaked pressure through the intake valves, as you could hear it "burping" into the oil bath. Cylinder 3 also had a substantial leak from the exhaust valve. What was odd though was that I also heard a LOT of air moving in the area where the pushrods are located in the head on all 4 cylinders. It sounded below the top of the head, but above the mechanical lifters. You could feel the air moving if you held your hand over the area. At first I thought that it was blow-by past the rings, but if I opened up the oil level check petcocks, no pressure came out, the noise stayed the same, and there was no movement of air out of the crankcase breather. What else could cause such a noise in that location? It seems unlikely that it would blow the head gasket out on all 4 cylinders into the pushrod gallery when the water passage is directly in front of it and the radiator showed no bubbles during testing. Any ideas?
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