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Rod shims

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Marty

12-13-2000 08:27:31




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I'm rebuilding my C motor, and am a little confused. My shop manual says that I need to shim the rod bearings, just like the crank. According to the manual, new bearing will come with a pack of shims (4 shims @ .0025 per side?). My new bearings didnt come w/ any shims. Does this mean they arent required? My plan is to add .010 worth of shims per side of the rod, and then assemble w/ plastigage and see what I've got. This will give me the clearance, but how do I confirm that I have .0015 "bearing crush"? Any info. appreciated.

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Tom

12-13-2000 17:47:52




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 Re: Rod shims in reply to Marty, 12-13-2000 08:27:31  
If you carefully install the bearings in the rod and cap, (dry and clean) and place a straight edge across the bearing and rod, you will be able to measure the amount the bearing shell protrudes above the rod or cap with feeler gauges. Maybe a light tap on the bearing shell using a different straight flat peice of metal, and a light hammer, to seat it in it's rod or cap before measuring.



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Butch(OH)

12-13-2000 09:10:59




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 Re: Rod shims in reply to Marty, 12-13-2000 08:27:31  
The shims don't come with the inserts anymore. They are availible at AGCO. I can't remember the thickness of the original shimpack, but it is in the manual. If the rod I. D. is to spec the shim pack will give correct crush as is. If you remove more than 1 shim from the stack you will need to file the bearing shells to prevent over crushing the inserts. I measured the crush by placing a depth micrometer across the insert after it is installed in the rod or cap and made up my own shim stacks. Also, most of these engines have been rebuilt before and a few have had the rods resized to eliminate the use of shims.

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