Quote:
Originally Posted by Father Of Giants
Valves are stuck open or not sealing, why? Lord knows...
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From what I read so far, lapping is not enough for the valves in our diesels. The valves and seats should be ground by a machine shop, or you will have compression leaking past the valves.
Can't imagine that OP has enough compression leaking to show up as zero on a compression tester, but I would not be surprised to see this engine producing low power due to the valves. Just my 2¢.
Something has to be holding the valves open in this case. If you have new rings, new cylinder sleeves, new head gasket, and everything is torqued correctly, there is nowhere for the compression to go but out the valves. I am assuming you have the glow plugs installed.
Roverswap, what all have you done for this rebuild?