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John Deere B rod cap shims

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ihr190

03-09-2008 14:31:21

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This is my first two cylinder overhaul. When I took the caps off, I dropped the shims in the housing. I found them all, but I have no way of knowing how many there were on each stud. Is there any way of determining this? Thanks. Rob

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PBrowning

03-09-2008 14:39:07

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Re: John Deere B rod cap shims in reply to ihr190, 03-09-2008 14:31:21

ihr 190 -- You aren't the first one! Here is a paragraph lifted from the John Deere Model "H" Restoration Guide that will help. And if you have a question on this procedure, my email is open. (Texas Shorthorn)
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Trial and Error Method -- During reassembly, adjust connecting rod bearing running clearance to a value from 0.001 to 0.003 inch. Adjustment is by use of shims in attaching connecting rods to the crankshaft. Remove all the shims (one rod at a time) and measure the top and bottom stacks with a micrometer to ensure they are equal to start with. The thin shims are 0.003 inch thick. Install connecting rod with shim stacks and torque. If there is no binding or halting in crank rotation, remove 1 shim (top and bottom) and repeat until binding occurs. If there is binding, add 1 shim (top and bottom) and repeat. If it spins freely, you are good to go! NOTE: This trial and error series is much easier to perform �on the bench�, prior to installing the crankshaft and the rod & pistons units into the main case. ++++

Restoration Site, JD H

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