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Allis Chalmers Discussion Forum
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Cracked block

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CASEPOWER

06-02-2005 14:37:47




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Has anyone put a tie bolt across the block when the block has cracked between the sleeves? I have a CA that is cracked and was thinking about drilling a hole through the block, between the sleeves to pull the block together tight. If so, any problems sealing to keep the water from leaking?




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steve(ill)

06-02-2005 18:56:56




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 Re: Cracked block in reply to CASEPOWER, 06-02-2005 14:37:47  
yes a tie iwll work. there is a guy on this site named Dick Leamons or Dick L. he had a post a year back where he took out the freeze plug on one side and drilled thru the wall below it and out the other side. put a bolt thru and loctited the outside and ground flush. the head side was covererd by the freeze plug. look for a post by Dick L and i am sure he will talk more about details and photos. here is his web site. Link

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Dick L

06-02-2005 18:55:21




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 Re: Cracked block in reply to CASEPOWER, 06-02-2005 14:37:47  
Yup, Done some!



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mlm

06-02-2005 17:08:55




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 Re: Cracked block in reply to CASEPOWER, 06-02-2005 14:37:47  
we ran a farmal b for years with two threaded rods pulling the cracked block together. also I have heard that ferguson to20 are knowen to crack between the sleeves. There is a fix where sealer is sprayed in the crack before the threaded rod is tightened down.



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CASEPOWER

06-02-2005 18:33:23




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 Re: Cracked block in reply to mlm, 06-02-2005 17:08:55  
Thanks! Just wanted to see if anyone has done it without leaking problems.



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Texas Denny

06-02-2005 14:52:43




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 Re: Cracked block in reply to CASEPOWER, 06-02-2005 14:37:47  
Just where are these cracks you refer to? Are they on the top of the block in the web between the cylinder sleeves? If these are the cracks that you refer to, these generally don't cause a problem. The seal on the top is done by the head gasket.

If you were experiencing water in your oil pan, cracks on top of the cylinders aren't causing that. If you have water getting into the pan (and you didn't find a problem with the head when you had it pressure tested), your next point of concern is the o-ring seals on the bottom of the sleeves. You need to pull the sleeves and inspect these seals. They frequently go bad. If they are in good condition (no cracks or tears or gouges), you'll need to carefully inspect the web between the sleeves on the bottom of the block. You are looking for cracks. If you haven't found the problem after that, you should have the block magnafluxed.

Replace the o-rings when reassembling.

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CASEPOWER

06-02-2005 14:59:39




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 Re: Cracked block in reply to Texas Denny, 06-02-2005 14:52:43  
There was no water in the oil, but I just don't prefer to put it back together with .040 cracks between the cylinders.



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Texas Denny

06-02-2005 15:22:20




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 Re: Cracked block in reply to CASEPOWER, 06-02-2005 14:59:39  
I've had apart 6 of these engines. Half had cracks and half didn't. They went back together fine and work without a problem. Drilling into the side of the block would create a weak point in the block and a potential for a water leak. I wouldn't do this.

Use the search routine at this site with the word "crack" or "cracks". There will probably be 100 posts on this subject.



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CASEPOWER

06-02-2005 15:37:00




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 Re: Cracked block in reply to Texas Denny, 06-02-2005 15:22:20  
The only thing holding the block together now, at the top, is the ends. A 3/8 hole through the side, between the center sleeves, won"t weaken it enough to hurt. It also couldn"t leak any worse then the 5 inch crack under the carburetor, on the side of the block. I am doing this as an article in a magazine, and I feel like I"m half a$$ing it if I don"t do something to strengthen it.



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Texas Denny

06-02-2005 16:23:56




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 Re: Cracked block in reply to CASEPOWER, 06-02-2005 15:37:00  
Yes, that is sort of true. But when you put the head on the tractor, the head will hold the top of the block together.

If you have a crack under the carburator, does the crack extend into the water jacket? A common practice on cracks is to drill a small hole at each end of the crack. These holes work to stop the crack from spreading.

It is your tractor and you can do what drilling if you want to. Post back on here if your results are encouraging.

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CASEPOWER

06-02-2005 18:31:31




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 Re: Cracked block in reply to Texas Denny, 06-02-2005 16:23:56  
Welding the crack under the carb is no problem. I prefer to nickel weld while pre heating and using the torch to bring the temp down slow. I have also added electric start on by welding cast on Case tractors. I would just like to explain that some of my readers wouldn't understand, putting a cracked block back together.



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Dick L

06-03-2005 05:34:32




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 Re: Cracked block in reply to CASEPOWER, 06-02-2005 18:31:31  
I think I would stitch the crack on the side of the block. Stitching takes longer but is almost unseen when properly bround and painted. I like the tie bolt for the freeze cracks between the cylinders which opens the cracks more than the normal heat cracks that most encounter when inspecting their blocks. The freeze crack can not only open up a crack but cause the deck to be uneven as well. ( one side higher than the other) Even pulling the block back with a tie bolt you might still need to deck the top of the block.

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Gov'nr

06-02-2005 17:03:16




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 Re: Cracked block in reply to Texas Denny, 06-02-2005 16:23:56  
A while back I was rebuilding a wc engine when I ran into the same problem. I came to this site and gene from Mo sort of told me the same thing. Denny I believe at the time, you may have also. I talked to ALOT of local tractor heads that, again, told me the same thing. Denny knows what he's talking about. By the way Denny, yourself along with a few other people on this site, have helped alot of people on ac questions. Thanks a million to each and every one of you for being here!!!!! !!!

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CASEPOWER

06-02-2005 18:21:19




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 Re: Cracked block in reply to Gov'nr, 06-02-2005 17:03:16  
I have no doubt that it will hold up fine, but you have to understand my position. I am not doubting anyones word, but my question was not "will it be ok?" It was, has anyone used tie bolts to pull it together?



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Gov'nr

06-02-2005 18:44:05




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 Re: Cracked block in reply to CASEPOWER, 06-02-2005 18:21:19  
No worries Case Power. I just seen the opportunity to thank these guys for all their help with answers, that's all. I know I've had lots of questions, and most of the time all I have to do is read the archived ones. This site and these people jsut have sooooo ooo much information to share.



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