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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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BLOCK ADVISE

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CMCCOY

07-11-2006 18:00:14




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WELL J. SCHWIEBERT REALLY HELPED ME ON GETTING MY PISTONS AND SLEEVES OUT OF MY 770. SO NOW THE BLOCK IS BEING HOT TANKED AND MAGNA-FLUXED TO SEE IF IT HAS ANY OTHER CRACKS. MY QUESTION IS THIS: I KNOW THAT I HAVE A 6 INCH CRACK TO A OUTSIDE WATER JACKET ON THE MANIFOLD SIDE OF THE BLOCK. I WILL NEED TO REPAIR BUT HAVE NEVER WELDED CAST IRON. I WELD MILD STEEL ALL THE TIME, IT IS MY PASSION BUT NOT CAST. I AM NOT COMPLETELY IGNORANT OF DIFFERENT WAYS TO DO IT BUT THOUGHT MAYBE YOU GUYS COULD GIVE ME SOME HANDS ON EXPERIENCE AND SUGGESTIONS ON THE BEST WAY TO REPAIR THIS. I WAS GONNA JB WELD IT BUT I'D LIKE IT TO BE MORE 'PERMANENT' OR AT LEAST IN MY MIND. I HAVE HEARD OF COLD WELDING, BRAZING(TRIED IT ON CAST AND WAS TERRIBLE AT IT). ALSO HEARD OF VARIOUS NEW ALLOYS OUT THERE LIKE NICKLE RODS ETC... WHAT DO YOU GUYS USE. AND WHAT TECHNIQUES OR TIPS CAN YOU PROVIDE. SORRY SO WORDY. AND BY THE WAY "THANKS JAY"(IF YOU READ THIS) CHRIS MCCOY

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old cout. man

07-12-2006 23:59:09




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 Re: BLOCK ADVISE in reply to CMCCOY, 07-11-2006 18:00:14  
"YES" Pin it you put no stres in the block and it is perment. In the beging irontight was the first to make pins but the problem with them was that they were taperd and spred the crack and put stres in the block. Then two welders came up with new pins that were stright therd 1/4-24 and made out of a ductel metal that expanded and contracted at the same rate that the cast dose.check around auto motive machine shops they will have some.

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MikeS55d

07-12-2006 12:51:14




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 Re: BLOCK ADVISE in reply to CMCCOY, 07-11-2006 18:00:14  
Here is a company that does stitching with their own proprietary design locks. Look under "repair examples" for some amazing repairs.
http://www.locknstitch.com/



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mrush

07-12-2006 09:18:13




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 Re: BLOCK ADVISE in reply to CMCCOY, 07-11-2006 18:00:14  
pay very close attention to webbing inside bolck between cylinders, when water freezs it expands ia all directions, pipe plug idea sounds good--- but maybe not for a 6 inch crack. correct welding procedure consists of preheating entire piece of work and then stress relieving it- during and after the weld is being made, at the same time not creating any localized hot spots. (I witnessed a fella crack a block by heating the block to get a stuck plug out..oops!) Suggest a profession cast welder or replacement block--good luck.

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RAB

07-11-2006 22:36:06




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 Re: BLOCK ADVISE in reply to CMCCOY, 07-11-2006 18:00:14  
Two things:
1. stop shouting - turn OFF the caps lock.
2. Follow JS"s advice
RAB



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CMCCOY

07-11-2006 19:07:16




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 Re: BLOCK ADVISE in reply to CMCCOY, 07-11-2006 18:00:14  
Jay, when you say pin it do you mean the technique that josh has decribed? I have also heard of patching them with a plate of steel and drilling and tapping into the block and essentially bolting the steel plate to the block with gasket material between the two. sounds good but very noticeable. tell me more about pinning if you can. Chris



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J Schwiebert

07-11-2006 18:18:29




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 Re: BLOCK ADVISE in reply to CMCCOY, 07-11-2006 18:00:14  
Don't even think about welding it. First look to make sure NONE of the webs between the cylinders at the bottom are cracked. Then if they are not pin it (cold crack repair) You will be much better off in the long run.



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Josh U

07-11-2006 18:13:10




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 Re: BLOCK ADVISE in reply to CMCCOY, 07-11-2006 18:00:14  
If the crack is accessable on the outside of the block a good way to do it is to drill and tap for 1/8 pipe plugs. drill and tap a hole on the crack, install plug, grind off, drill and tap another overlapping hole, install plug, grind off and repeat. takes a while but easier than welding.



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Super 55

07-11-2006 18:53:49




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 Re: BLOCK ADVISE in reply to Josh U, 07-11-2006 18:13:10  
I have read about block "stitching" a long time ago. Does sound like a non-intrusive way of fixing a crack. Do you put any sort of compound on the pipe plugs to glue them in place for added security?



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