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Message: <blockquote data-quote="UnexpectedBill" data-source="post: 135073" data-attributes="member: 21648">I've been watching this thread, and as an old gas engine mechanic I can't help but wonder... What do you deisel guys think about this?  1st, Since it does start and run well, check & eliminate the possibility you have a valve that's out of adjustment. Valve lash gets looser as the engine warms up, it seems weird that it doesn't knock at startup, and I have - very rarely - seen an adjustment come loose.    2nd, if it is the bottom end, the biggest thing is to stop using it before rolling a bearing scoring the crank beyond hope.       Pull the engine, drop the oil pan, and inspect the bearings ad journals. With 6k hours they will be worn. More importantly,  how does the crankshaft look? If it looks okay, measure it with a micrometer to verify the size, that it hasn't been machined before.  If still good, roll in a new set of main & rod bearings and reassemble with new gaskets.  Is this the best route? Obviously not. But if the engine is in otherwise good shape, it's an economical way to squeeze a few more years out of it while you save for the inevitable rebuild  / replacement. I've seen this done.</blockquote>