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Allis Chalmers Discussion Forum

Engine Rebuild Revisited

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02-08-2004 05:37:42

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This is continued from an earlier post. I thought I'd start fresh. I wasn't doing it wrong. I put a straight edge accross the journals this morning and sure enough the center main is a few thousants high. I was wondering why when I was cleaning up the old shims I had 21 instead of 18. It was probably never done right. Here's a new question. I take the block and have it line bored. How do I make up for the extra diameter in the center journal, Add a shim behind the cap bearing?

I should have known. I picked up my crank and block (crank ground, block hot tanked) Friday. My engine kit arrived. Got the block on the engine stand and did some finish cleaning so that Saturday and Sunday I could finish the rebuild. It was just going too smooth.

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Greg in IA

02-08-2004 09:30:52

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 Re: Engine Rebuild Revisited in reply to CH, 02-08-2004 05:37:42  
What WDTom said is correct... The caps are cut down and then the bore is re-bored to the proper spec. If it is pretty close, it may only require line-honing, but it sounds like your block needs bored. I would also recommend resizing the rods as they might be distorted from the crank having to run funny. The rods shouldn't cost too much. Around here it only takes $60-100 to do all 8 from a small-block chevy.


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02-08-2004 06:35:58

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 Re: Engine Rebuild Revisited in reply to CH, 02-08-2004 05:37:42  
I would say they will cut the cap down, bolt it to the block and then bore both as necessary, but ask your shop how it is done, I don't really know, but as someone who deals some with machine work this is my idea of how I would do something like this.

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Dave R (MN)

02-08-2004 09:22:25

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 Re: Re: Engine Rebuild Revisited in reply to wdTom, 02-08-2004 06:35:58  
As long as you are at it, you might want to bring your rods in and have him do them too. Depends on how much your time is worth to you as to weather it's worth it or not. Just something to think about.

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