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Allis Chalmers Discussion Forum

cracked block on G

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Author  [Modern View]

03-12-2011 14:47:14

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My buddy has a G that somehow froze and cracked the block. Its a vertical crack on the back right corner behind the generator. Would it be better to braze it or just use stop leak. Its a small crack that isn't spread apart. It just drips a little. If we do braze it, is it best to preheat and then braze?

Thanks to all you experts.


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Dick L

03-13-2011 11:13:18

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 Re: cracked block on G in reply to teachingscience, 03-12-2011 14:47:14  
I wouldn't hit that with any type of weld unless you took it to a engine shop that does this and had the equipment. You can Vee out a water leak and use an epoxy type stuff like JB Weld or several types of such materials. It does not take much to hold water in an engine that does not even have a water pump. Stitching would be a better way to go if you are afraid of the epoxy materials. Stitching is where you drill and tap a tapered hole and screw in a tapered screw. then you drill half of that screw out and tap and insert another screw. This is done one after the other until the crack is sealed. No heat expansion to cause further problems.
I bought and drove a car with a crack seald with plain ole pink bondo that never gave a problem with any type of further leaking from the crack.

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WV Ike

03-12-2011 21:27:07

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 Re: cracked block on G in reply to teachingscience, 03-12-2011 14:47:14  
I still prefer brazeing. Just be sure to drill holes at each end of the crack and about every half inch. I'm about 30 miles from Winchester VA and if you need a block I have a good N-62 block. Would be very cheap. It's out of a Massey Pony. but same engine.

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03-13-2011 06:54:39

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 Re: cracked block on G in reply to WV Ike, 03-12-2011 21:27:07  
The block is different on the Pony, won't work with a G as the starters mount different. Every other part except the head is the same

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03-12-2011 19:03:15

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 Re: cracked block on G in reply to teachingscience, 03-12-2011 14:47:14  
A model G tip.

This is not about your friends problem, but the G has a bad name for cracked blocks. Near the drawbar supports, the decal is supposed to read Do not hitch to anything besides the drawbar. If you hook a chain to the supports, (very handy place) they will bust the block if you should jerk the chain. Note the two bolts on each side are designed for a downward pull, not sideways.

Another thing about the G, is that you are supposed to store it with the clutch locked down.

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03-12-2011 16:13:21

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 Re: cracked block on G in reply to teachingscience, 03-12-2011 14:47:14  
I would arc weld it with Super Missile Rod after I "V"ed the crack. then only welding about One inch , let it cool, go to the bottom and weld another bead, cool and back to the top and back and forth with cooling between each bead. The rods pricey but excellent.

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03-13-2011 19:11:13

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 Re: cracked block on G in reply to Greenworm1, 03-12-2011 16:13:21  
Thanks to everyone. If the stoplead doesn't work guess we'll take it to an expert. I will try about anyghing but would feel terrible if I messed up his G.

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