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Tractor Talk Discussion Forum

Cracked Block

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Matt Kane

07-22-2006 08:59:10




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I have a super 55 I just had rebuilt. When I was driving it, noticed a small hairline crack behind the injection pump. The shop tried to repair it welding it, but there still is a leak. They said its probably a pinhole, and when the motor warms up it stops leaking. Its on the outside and they have tried aluminum sealer in the coolant with no luck. Do you think I could clean up the area if its just a pinhole and use JB Weld? I would like to get my tractor back from the shop. They are at wits end with the leak.

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Leland

07-23-2006 03:47:49




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
If I understand right you paid somebody to build you an engine ,so take them to small claims court the judge will side with you since you did not get what you paid for . This shop is expecting you to pay for there mistake .



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Johnski

07-22-2006 18:43:04




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
If the crack hasn"t spread past the ends of the weld and it really is a pinhole or two the you can repair it with solder. Clean up the area with a wire wheel, use a rosebud tip to warm it up, then flux and lay some solder over the spot. Auto body lead works best but 50/50 plumbing solder will work too. I had an 8 inch crack in the side of a 335 Cummins that was done like this and lasted the 10 years we had it. HTH Jf P.S. I showed the crack to the new owner and he still bought the truck.

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future tractor man

07-22-2006 14:36:41




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
Sorry, Since its welded already you should of drilled two small holes at the beginning of the crack and the end of the crack so it can't continue to crack after its welded. Now you need to dry the area completely and preheat it to expand it and make sure all the moisture is out of the area. Then weld it but make three passes wide in that area so your wider than what is needed to seal it good. While its still hot cover it with a few old leather welding gloves or use the torch so it cools slowly. If you let the weld cool too quickly it can crack again. I've fixed a few cast iron blocks already and some for boats too with great results.

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future tractor man

07-22-2006 14:22:42




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
You can arc weld it with certanium welding rod they make some of the best cast iron rod there is.



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Logan in S.E. Texas

07-22-2006 14:20:00




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
This link was posted here a while back to similar question. Seems like they have it all figured out.

http://www.locknstitch.com/



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Dave in Tx

07-22-2006 13:58:35




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
NAPA has some stuff in a tube you mix with your hands, patched a cat block with it 5 yrs ago and still holding. can't remember the name of it. it is epoxy that is grey with black center. can be drilled and tapped.



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Matt Kane

07-22-2006 13:39:17




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
I used to be a machinist, so just center punch the hole, drill and insert a pin? Where can I buy the pins, and what type of drill bit would I use?



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J Schwiebert

07-22-2006 13:32:32




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
Throw all those suggestions away. That is what happens when cast iron is welded. You find pin holes and often in other places. I would take the pump off, get a pressure tester for radiators, pump is up to 10-12 psi and take a center punch and mark the hole and put a pin in it. More details find on the hpoca group (oliver group) Do it quick as I am out of town next wek. J.



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Matt Kane

07-22-2006 12:40:18




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
They tried to repair it, but they dont want to pay to repair it correctly even though they sold me the block cracked, didnt know it then rebuilt it. Pisses me off. I have alot of new parts in it and its cracked. I wonder if someone could come out here and weld it?



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NcNE

07-22-2006 12:31:58




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
One thing to keep in mind if you decide to weld/braze the crack, (assuming its cast iron) make sure that the heat is distributed evenly or you will have a crack that is worse than the one you had before. Depending on your ability I'd have it taken to a welding shop to avoid more possible problems. Hope this helps. NC



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oldcraneguy

07-22-2006 11:22:05




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
I had about a 2in crack on and old chrysler flathead 6 in a crane once, the fella whose dock pile I was driving wire-wheeled it good and patched it with marine-tex, figured it to be a temp fix but it was still holdin over a yr later when I last ran the machine.



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hay

07-22-2006 11:02:23




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
brazing is the only sure way of fixing it. all them other glues, epoxys and other potions are not for that type of repair.



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shawnspeed3

07-22-2006 09:24:59




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
JB weld does not like anti-freeze,it also doesn't like heat, add the two ,and you get a mess. my suggestion would be to dump some aluma seal in the radiator , if it is a pin hole as you say...if it is a crack,you may want to pull it down and braze it , as long is it's not a structural area of the block...Shawn



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Matt Kane

07-22-2006 09:20:05




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 Re: Cracked Block in reply to Matt Kane, 07-22-2006 08:59:10  
I have to add, I heard JB Weld doesnt like cooling systems, (Antifreeze). Anyone ever heard this?



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