dakota49
Gen I
 
10/28/2008
20:23:22
|  RE: 93 3.9 Rebuild Help
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Sounds like you may have a rod bearing going bad, one thing you might do to confirm it is a bearing is change the oil to a heavy oil, like 20W50 and see if that quiets it down if so then my guess would be bearings wore out.
With 170K I would suggest either a rebuilt long block, or do a complete rebuild on what you have. Most likely, you will need to have the crankshaft reground, and the rod's resized at least that's what I had done to mine when I rebuilt it. I also had it bored, honed, a complete valve job, mill the block and heads and replaced everything that wasn't rebuilt, reground, or other wise able to be reused.
Good Luck
Dakota49
1988 3.9 4X4 5speed
dakota49
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Subject: 93 3.9 Rebuild Help