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John Deere Tractors Discussion Forum
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welding diesel block

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35deeregp

12-05-2006 11:16:18




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I have a 70 diesel with a cracked block. I have been researching a 2 pass welding system by Muggy that they say will not crack. Has anyone used this product with success? This is not a parade only tractor. It gets a hard work out several times a year.




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1936

12-06-2006 08:17:16




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 Re: welding diesel block in reply to 35deeregp, 12-05-2006 11:16:18  
Should crack ahead of your weld. Last 70 block I know of was taken to a mchine shop and is still running.



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buickanddeere

12-05-2006 15:33:40




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 Re: welding diesel block in reply to 35deeregp, 12-05-2006 11:16:18  
Did the stud get turned hard into the bottom of the hole and bust the casting?



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Glen in TX

12-05-2006 13:41:29




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 Re: welding diesel block in reply to 35deeregp, 12-05-2006 11:16:18  
Never tried that rod yet. Give these guys a call or find someone in your area that does it.



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35deeregp

12-05-2006 13:18:10




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 Re: welding diesel block in reply to 35deeregp, 12-05-2006 11:16:18  
blksmok, you must have a crystal ball! The crack is exactly where you said in the pump galley, pulley side, directly behind the stud socket. Still a fixable block? Is this preheating/post heat cool necessary? Muggy info says no. I realize sales pitches and real world can be different.



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F-I-T

12-05-2006 13:03:20




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 Re: welding diesel block in reply to 35deeregp, 12-05-2006 11:16:18  
Yes, I have used the Muggy weld rod, and I really like it. It's easy on and easy to machine/grind. I like to pre-heat/post-heat like everyone else recommends, and I think if a person even laid it on a good hot bed of coals or a charcoal bed in a cooker, to pre-heat it, and then returned it to the coals to let it cool down as the coals died, it might be the ultimate in stress relieving. I have been talking to my buudy who is a local farrier/blacksmith, and he likes to use his forge to warm castings on, and then he plunks them into a barrel of dry kitty litter after welding, and covers them until the next morning. Cast iron welding definately takes some pre-op and post-op planning, but the results can be remarkable. I think the reason you don't see alot of good casting repair is that few folks take the time to get really good at developing and perfecting a reasonable process.

Now the key question: Where is the crack? If it is water jacket only, I would not hesitate to repair it using Muggy Weld. You could probably use a rosebud torch to pre-heat and slo-cool-down if you wanted to. If it is on a high stress point, I'd have to think hard and long about it. Especially with the excessive thumping vibration that a 70D incurrs.

Frank

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Blksmok

12-05-2006 12:50:29




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 Re: welding diesel block in reply to 35deeregp, 12-05-2006 11:16:18  
35deere...let me guess. It cracked in the injector pump valley under the pump on the pulley side of the tractor (????) I agree with Mike M's comments, but I've seen repaired blocks last for many years. Main concern is the porosity of the weld(s).



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Mike M

12-05-2006 12:22:54




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 Re: welding diesel block in reply to 35deeregp, 12-05-2006 11:16:18  
Once a crack always a crack and a chance to leak. It really depends on where the crack is ? just water jacket ? stud hole ? water to oil that will mix ? cyl. wall ?

I never used that rod before but FIT has maybe he will read this.



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