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Tight rods mains

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ryan carlson

11-24-2000 12:30:57




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after turning the crank on my ac C .010 under on the rods and mains, verifying that the rods mic out at 1.927, and inserting bearings that are labeled .010, when torqued down everything locks up. Is it common practise to shim the caps on these? Also note that plastigage totally flattens out when any journal is checked. Any assistance would be greatly appreciated.




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Sandy Lake Implement

11-26-2000 21:17:51




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 Re: tight rods mains in reply to ryan carlson, 11-24-2000 12:30:57  
We stock the OEM laminated shim stacks.



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Dick L

11-25-2000 04:17:53




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 Re: tight rods mains in reply to ryan carlson, 11-24-2000 12:30:57  

Ryan, you have two choices, and at this point maybe only one. All the rod caps are short and will have to be shimmed. This is the way they are manufactured so that shims can be removed after some ware to keep close to the .002 clearace rather replaceing bearings each time. The second choice would be to have the rods reconditioned so you wouldn't need shims.
The mains need shims also on these engines. It goes good with the engine bottom side up, but this old man has problems laying under the tractor and making any time. I have not found any of the peal off shims they used years back that let you put the correct thickness under the rod caps in one piece. I use a rod cap to mark the .001 and .005 shim stock. You have to watch that the front of the shim does not get under the bearing insert. I find that it takes form .007 to .009 to fit a reground crank but you never know on old rods how much had been filed off before. All bets are off as what you will need to have the .002 clearance needed.

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mike

11-24-2000 15:39:17




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 Re: tight rods mains in reply to ryan carlson, 11-24-2000 12:30:57  
Ryan- make sure that you don't have the rod caps mixed up. that would cause a clearance problem and would lock up a rod bearing. If not, you just may have to shim them.



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Tom

11-24-2000 19:42:53




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 Re: Re: tight rods mains in reply to mike, 11-24-2000 15:39:17  
On B and WC, WD, etc I think that the inserts need to protrude above the rod and rod caps one and one half thousands for proper "crush" Shim the bearing caps for this. On my Wd the mains had .010 shims in them when I took them aprart and the rods all had an assortment of shims, I didn't measure them, the book tells how to set them up. My book is out on loan for a few days, if you want e mail me and I will send you the exact wording.

Tom

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