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Allis Chalmers Discussion Forum
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cracked block question

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Mr. B

09-24-2003 13:48:15




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I have a 1935 WC with a crack in the side of the block. The crack is in the water jacket only. I'd like to keep all the original parts if possible, for restoration. Can this be welded? Is there any other permanent fix for this problem? I'v been told that JB Weld or similar products would work. I need to know for sure before I go ahead. I'd hate for the leak to redevelop down the road after she's all painted. Any help would be appreciated. Thanks.

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Larry

09-24-2003 19:17:04




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 Re: cracked block question in reply to Mr. B, 09-24-2003 13:48:15  
I have tried the JB and other epoxys and it is never a permanent repair. I tried an experiment in the spring. I made a plate out of light sheet metal, drilled a hole where the petcock goes, about 4 iches wide. I ground the block to bare iron and installed the plate with automotive windshield urethane. Think how hot that gets in the sun on a hot day, and stays pliable enough to not crack and leak. So far, it has not leaked one drop. I put a lot of the urethane on, and when it oozed out the edges, smoothed with a small brush. Painted, very nice repair.

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Steve in N.J.

09-24-2003 19:01:04




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 Re: cracked block question in reply to Mr. B, 09-24-2003 13:48:15  
Mr B,
We've used JB Weld for quite a few years successfully repairing cracked blocks. Before adding the JB Weld to the crack, I "V" out the crack a little with a whizzer wheel, spray some Brakleen to clean things out, and then mix and ad the JB Weld. So far this stuff works great! From AC engines, to 800 cubic inch Cummins engines. Great stuff!
Steve/B&B Custom Circuits



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wdTom

09-24-2003 18:45:55




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 Re: cracked block question in reply to Mr. B, 09-24-2003 13:48:15  
Dave and Dick gave good advise, I would only add that I would try and sandblast clean the area to be JB welded or for that matter welded, the cleaner the better for either. Another repair I have thought but not tried would be to make a plate maybe 16 gage or about 1/16" thick and attach it to the block to cover the crack using no. 8 or 10 screws, that is drilling and tapping the block for the patch, then putting gasket silicone behind it. Would have to be in a fairly flat area, but most of the cracks in blocks from freezing that I have seen usually are.

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Dave K (FL)

09-24-2003 17:30:16




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 Re: cracked block question in reply to Mr. B, 09-24-2003 13:48:15  
It depends upon the size of the crack. Some shops will weld cast iron. I have used JB weld on one tractor where I could get to the inside of the water jacket, clean and buff it and then use JB weld. It has held up under field use for five years now. I tried several times to repair it from the ouside but it always would seep anti freeze until I got it from the inside. Some recomend drilling the ends of the crack to prevent spread but this one is where there is no stress and it has held okay.

Dave

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Dick2

09-24-2003 15:07:30




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 Re: cracked block question in reply to Mr. B, 09-24-2003 13:48:15  
There are some machine shops that repair cracked blocks by drilling, tapping and installing threaded plugs - then drill out part of the plug, thread, tap and install another plug until they get to the end of the crack. We had this done on our 1948 G JD about 50 years ago and it is still holding perfectly. My nephew has the tractor now.



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