Re: rod bearing shims

Posted by riverbend on March 28, 2004 at 16:22:52 from (208.160.34.7):

In Reply to: rod bearing shims posted by Jonathan Mirgon on March 28, 2004 at 03:09:24:

I found 0.002" copper shims under half of the bearing caps on my H. I had foolishly thought that they were there to shim up worn bearings.

For some reason, the crank appeared to be ground 0.022" undersized. Of course I had $70 worth of bearings installed before I discovered my mistake. Plastigage showed 0.004 - 0.005" on all the journals.

It was getting late in the year, I did not want to use Marty's plow truck (no brakes) again, the motor runs real slow even at WOT, the new CR figured out to 6.75:1, and it had been like that for at least 15 years, so I decided to put 0.001" copper shims behind all the shells.

Plastigage showed 0.002 - 0.003" across all the journals. Only one rod bearing looked to be a little tapered (~0.0005"). So far the oil pressure looks good, but it has been cold. If it blows up this summer, I will let you know.

If time and money were no object, the right way would have been to have the crank reground to 1/32" undersize. Reading Justin's post, I would be curious to know how much a machine shop could take off the rods and the block before causing problems with the way the bearings fit.

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