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Tractor Talk Discussion Forum

Cracked Block

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Charles Hinton

04-26-2008 16:49:45




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I acquired a Case DC3 back in January in need of a complete restoration, but due to health problems I haven't been unable to do anything with it until now. Upon pressure washing the engine the other day, I noticed what appeared to be a crack about 8 " long opposite the carburator. I filled the engine up with antifreeze to see if anything seeped out, and yep it did, slightly it one place. I used to weld professionaly, so I will try to repair the block rather than replace it. What I'm going to try to do is grinding out the crack, welding it with nickle rod, grinding down the weld so everything will look nice and then use flux bronze rod to fill any voids. What do you'll think? This the first time I've tried to repair a water jacket crack.

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guido

04-28-2008 15:44:35




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 Re: Cracked Block in reply to Charles Hinton, 04-26-2008 16:49:45  
Hello Charles Hinton.
About using cast rods to do the welding? Then you only need to grind the excess weld and you will be done. Make sure you preheat the area and clean it after you prep and grind it. You also neeed to stop drill the area on both sides of the crack.
Do a little practice with the rod and you will be more confident when you do the final repair weld. Good luck!
Guido.

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trucker40

04-27-2008 09:51:50




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 Re: Cracked Block in reply to Charles Hinton, 04-26-2008 16:49:45  
While that Muggyweld video is real good of an example,especially the one where he grinds off the slag,you can use 7018 if its cast steel.Might want to drill a hole in each end and grind it to a V first,then take the chill out with a torch and weld maybe a little less at a time than they do in the Muggyweld video.



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Vern-MI

04-27-2008 04:13:27




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 Re: Cracked Block in reply to Charles Hinton, 04-26-2008 16:49:45  
Has anyone ever tried Muggyweld cast iron rods?

It would be interesting to try these on a scrap cracked block to see how well they work.



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Charles Hintonc

04-28-2008 00:19:08




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 Re: Cracked Block in reply to Vern-MI, 04-27-2008 04:13:27  
The MuggyWeld rods look interesting, but damn they are expensive! I wonder about how many rods it would take to do what I need to do (weld a 8" crack)? I don't think I'll be doing much practising at these prices (7 rods/$55 +S&H)?



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gene bender

04-27-2008 01:54:50




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 Re: Cracked Block in reply to Charles Hinton, 04-26-2008 16:49:45  
I repaired a block that someone selded on and messed it up so i ground the stuff off. Then i used a rubbercement and let it cure. That was 5yrs ago and tractor gets used regular no problems. Your block was caused by freezing the chances are and even JB weld would seal it but its hard to use on a horizontal surface.



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johnski

04-26-2008 19:09:28




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 Re: Cracked Block in reply to Charles Hinton, 04-26-2008 16:49:45  
I had a 270 Cummins in an old Autocar that had about a 12 inch crack along the block. It had been repaired by welding and then floating solder over the weld. It was still holding fine when we sold it years later and this truck worked every day hauling gravel. HTH Jf



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Steve(ON)

04-26-2008 17:38:10




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 Re: Cracked Block in reply to Charles Hinton, 04-26-2008 16:49:45  
I the nickle will be OK if done a little at a time so the block doesn't get hot, I would forget about the bronze it will get the block too hot and cause more cracks.



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RayP(MI)

04-26-2008 18:12:01




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 Re: Cracked Block in reply to Steve(ON), 04-26-2008 17:38:10  
Might want to consider drilling holes at ends of crack to relieve stress before welding.



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