We had a couple of those NH220's running 100kw generators on the Adams class destroyer I served on in the early 90's. With only 4 head bolts per cylinder, they were prone to compression leaks, and the old Master Chief diesel inspector at Pearl Harbor was keen to this. He used to ding me on them every time, if the slightest oil bubbling by the head gasket was present. Didn't help that the counterbores could've used some attention. I got tired of that real quick, so I went and bought some copper spray-a-gasket one day, and sprayed down the head gaskets real good with it. That did the trick. I cleaned up all evidence around the edges, and never did tell him how I fixed them, but he left me alone after that. :D And yes, torquing the head bolts to 600lb-ft was a chore in a cramped space.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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