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Allis Chalmers Discussion Forum
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Piston order

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Cman

12-12-2007 13:40:21




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1949 A/C B

I am re-assembling the motor for the above tractor and switched the pistons for No 2 and No 4. Wanted to put them back in the same holes they came from but carelessly put No 2 piston in No 4 cylinder, and No 4 piston in No 2 cylinder. Does this make any difference. Can any piston go in any hole? I do have them installed as per the AC-11 manual, with the wide part of the bearing facing in the right direction. All the rods are centered on the piston pins.
If someone could help me here, I would greatly appreciate it.

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A/C BOY

12-14-2007 06:45:53




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 Re: Piston order in reply to Cman, 12-12-2007 13:40:21  
If this was my tractor I would not be concerned about the pistons but the rod inserts. If you do not put them back like they can out you will cause a new wear pattern on the crank. And that would not be good it could start using oil or become loose and eat up the inserts. (Bearings)



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Cman

12-12-2007 15:22:05




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 Re: Piston order in reply to Cman, 12-12-2007 13:40:21  
I replaced the rings only. As I took a piston out I marked the rod cap with a file so I would know which cylinder to put it back in, not replacing the rod bearings so I think I just answered my own question. The rod caps were not away from the rod it was on. As an after thought I think they should be switched back to the original cylinder The bearing are almost new, but I feel they should be put back on the journal the came off of. Thanks for your replys.

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old

12-12-2007 16:57:31




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 Re: Piston order in reply to Cman, 12-12-2007 15:22:05  
Yep if not replaceing the bears in the rod you better switch them to where they came from or you will probably be replacing the block in a year or so



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Texas Denny

12-12-2007 14:56:17




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 Re: Piston order in reply to Cman, 12-12-2007 13:40:21  
I've never done this but I don't think it should cause a problem, if the pistons moved in the cylinders freely. I am assuming that you put in new rings. I'd be more concerned with the connecting rods and caps than the piston.

I'm curious how you determined they are in the wrong holes. Do you have the correct caps with the matching connecting rod? If you don't, I'd pull it apart and correct. The rods and caps are line bored - you can't replace a cap - must do the rod and cap together.

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old

12-12-2007 14:48:24




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 Re: Piston order in reply to Cman, 12-12-2007 13:40:21  
In theory its ok to do that but, because of wear its not a good thing to do. In theory a piston is a piston but. Now if your going with new sleeves and pistons it doesn't matter. And most of the time you will be ok with what you did but theres always a chance that because os wear some thing will not set in correctly

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