D 239 Engine

JLE · Sep 1, 2008

HELP D239 engine. Complete rebuilt two years ago including a new crankshaft,rods checked (one was so bad had to replace) line boared cam brgs, P&S. ect. This summer it devoloped a noise. Tearing it down found that the Mains were bad, but the rod brgs were good. Had crank ground, mains to .010 US rod journals only needed to be polished. Now question is why did the mains burn out and not hurt the rod brgs.I always believed the mains got oil first and the the rods next. This one has me stumped!!! Going to start putting to geather this week and looking for ideas. Thanks. JLE

teddy52food · Sep 1, 2008

Was the block and oil passages clean before it was assembled? The mains got the dirty oil first.

JimB2 · Sep 1, 2008

Hi JLE, how is the oil pressure? Check the engine crankshaft balancer for wear allowing oil to escape back into the oil pan.

JimB

D 239 Engine

JLE

Member

teddy52food

Well-known Member

JimB2

Well-known Member

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