Mark, with all due respect... this is one of those times where it just needs torn apart to find out what's wrong. Short of a bent exhaust push rod as been suggested he's either got a burn valve or a bent valve stem or an adjustment issue preventing the valve from closing. These are interference fit engines so the piston is generally going to knock the valve home anyway. It's of the greatest importance that he gets in there now and finds the problem and fixes it before it makes a much bigger problem. One valve and grind is not a big fix along with a head gasket.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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