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JD A Main Bearings

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Neil Johnson

02-16-2000 13:50:52




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The bottom of the mains have some wear of the babbit and the bronze in showing through while the tops show very little wear. Are the top and bottom the same and can they be rotated to get longer life from the bearings? Deere wants $120 for a new set (right & l




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clooney

02-17-2000 13:55:14




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 Re: JD A Main Bearings in reply to Neil Johnson, 02-16-2000 13:50:52  
Neil, if you have gone to all the trouble to go into your engine that far you should really consider putting in new main bearings. You will have a hard time keeping the oil from leaking because the clearnce on the top of the bearings will let massive amounts of oil past. Do not use plasti-gage to set clearnce on a worn crank (the cranks on J.D. 2-cyl. engines wear out of round) you will end up with tight bearings. Just pull equal shims & tighten bearing halfs until a slight resistance is felt in turning the crank then re-install a thin shim on each side to set the clearnce. You will have to pull the rod caps & push the pistons forward to remove the piston drag while doing this.

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RonMC

02-16-2000 18:37:47




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 Re: JD A Main Bearings in reply to Neil Johnson, 02-16-2000 13:50:52  
If you think about it, the real problem with worn bearings is the increase in clearance, which as it gets wider makes it harder to maintain the proper oil pressure at the same flow. If you reverse the bearings, you will not have changed the real problem. Afraid new bearings properly installed and plastigauged are the only permanent fix. The next stage if you leave it or swap top for bottom is a new crank. You haven't priced a crank, have you ??

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