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Wise crack?

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Scott

01-20-2002 16:46:59




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I spend most of my time with green and yellow tractors, but I have my Brother in law�s Farmall A in the shop. Among other things it has a cracked block behind the carb. It�s been fixed with JB Weld, but has started up again. Anyone know the best technique to repair the crack? JB Weld, braze or something else?




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JK

01-21-2002 05:34:20




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 Re: Wise crack? in reply to Scott, 01-20-2002 16:46:59  
Wayne's idea & procedure are very good but I would use 1/8" cast iron pipe plugs. Since thay are cast iron as is the block, they will expand the same as the temp changes & not leak. The taper on them seals very well. They also have the same texture as the surounding material and will be less noticeable especially if sand blasted when you are finished grinding.
John



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Don Young

02-02-2002 22:02:21




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 Re: Re: Wise crack? in reply to JK, 01-21-2002 05:34:20  
Brazing and welding are great if done by someone with lots of cast iron experience. The overlapping plug method is good, IF the very ends of the crack are located. It would seem to me that 1/8 inch pipe wlugs are a bit large, but I'm sure would work fine. I don't know where to get it, but there is a rod made for this; you just thread the end of it, screw it in, cut off, and repeat. My dad repaired a cracked block in a 1930 Chevrolet with a copper plate attached by drilling and tapping holes for screws into the block.

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Wayne

01-20-2002 18:36:03




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 Re: Wise crack? in reply to Scott, 01-20-2002 16:46:59  
If the crack is in the outside of the water jacket you can repair by several methods. Brazing or welding. Another technique I've seen is to start out at the very end of the crack, and drill a hole, tap it, insert a soft bolt, break it off and grind it smooth. Mover over about 2/3 the width of the bolt and do this again. (that is overlap the first hole/bolt with the second) and keep going until you get beyond the other end of the crack. If you want to make all of this look more natural, go over the entire repair with a needle scaler to roughen up the ground off surface. Will make a repair that is tight and un-noticeable. If the crack hasn't opened up too wide, you may be able to do it with 1/4 bolts or all-thread.

Whichever method you use, check, and double check to ensure that this is the ONLY crack that needs repair. (It's guaranteed to make you VERY grumpy if you do all this, then find there is another crack that cannot be repaired?)

Good luck

WW

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