Cracked block? |
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Ritt
Member Joined: 20 July 2005 Location: Bethel CT Status: Offline Points: 1989 |
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Posted: 20 July 2005 at 2:48pm |
Has anybody used JB Weld to seal a crack in the block? I have a 3" crack forward of the Distr. I ground a "V" into the crack, shined the cast iron and cleaned with acidtone, then let it cure for 2 days. Right now it's stripped down so I won't fill the block for a while. |
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Rit
1948 2A, "RAISIN COOKIES THAT LOOK LIKE CHOCOLATE CHIP COOKIES ARE THE MAIN REASON I HAVE TRUST ISSUES" |
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Doug
Member Sponsor Member Joined: 19 July 2005 Location: Central Iowa Status: Offline Points: 1373 |
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Humm, I used JB to trail repair a radiator once, along with some siler seal stop leak, it's still going after 4 years. Not sure how I feel about it on a block though, it may want to melt off if it is anywhere near the exhaust.
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Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out,
shouting "...holy cow, what a ride!" |
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jray
Member Joined: 19 July 2005 Location: Arnold, Maryland Status: Offline Points: 52 |
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cant you have it welded? seems like it would be better.
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Ritt
Member Joined: 20 July 2005 Location: Bethel CT Status: Offline Points: 1989 |
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I don't know much about welding but we have a vendor who does our welding (for submarine equipment) and he had a cast iron block he was repairing. It had to be heated to cherry red then brazed. I think it may be cheaper to buy another engine. Just what I know about it. Is there an easier way? My thoughts are, if the JB Weld doesn't hold, that's when I make the decision.
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Rit
1948 2A, "RAISIN COOKIES THAT LOOK LIKE CHOCOLATE CHIP COOKIES ARE THE MAIN REASON I HAVE TRUST ISSUES" |
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ed
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They make a liquid steel that is better than jb weld you can drill it and tap it and other things. Then again after you reassemble it and it did not work that is a lot of labor to throw away.
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Pete
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I had a block, water jacket, that was seriously cracked, and I mean really bad. Prepped it as for welding, then used a product called Marine Tex. It failed miserably!!! That same block is stripped right now and a friend of mine is welding it. Conventional wisdom says that you have to put it in a pig cooker, or something, and get it hot enough that you'll not shock the iron when you weld it. That shock will simply cause the crack to continue beyond the weld. What he's doing is using a gas torch with a rosebud tip to heat the area on both sides of the crack, immediately prior to laying down the bead with the stinger. In theory, it should work! Good luck! |
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Jeff
Member Sponsor Member Joined: 23 July 2005 Location: NH Status: Offline Points: 852 |
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I had a crack in my block just below the distibutor. it was welded with success over three thousand miles ago. they did a "stitch weld" and it has held fine. good luck!
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Ritt
Member Joined: 20 July 2005 Location: Bethel CT Status: Offline Points: 1989 |
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This is a very fine crack. Looked almost like a mark in the casthing. It was just weeping slightly.
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Rit
1948 2A, "RAISIN COOKIES THAT LOOK LIKE CHOCOLATE CHIP COOKIES ARE THE MAIN REASON I HAVE TRUST ISSUES" |
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Doug
Member Sponsor Member Joined: 19 July 2005 Location: Central Iowa Status: Offline Points: 1373 |
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I hate to even suggest this, but it would probably hold better than JB weld. An old trick used by pipe fittiers when dealing with a small pinhole or crack leak is to work lead wool into the crack (Lead wool is much like steel wool, but made of lead...LOL) Just hold a strand of the wool over the crack and gingerly work it in with a mallet and punch. The lead may not actually seal the crack, but it will corrode shortly and the corrosion will seal the crack. Chances are that whatever you do is going to only act as a bandaid, the crack will spread with time and heat/cool cycles. Welding in the correct mannor is the only hope for a true fix. Edited by Doug |
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Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out,
shouting "...holy cow, what a ride!" |
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CannonBall
Member Joined: 21 July 2005 Location: Maryland Status: Offline Points: 13 |
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working in a welding shop in college, I know most welders won't touch cast iron. it is probably the hardest metal to weld on as it like to melt away at welding temps. if you find someone compentent who can do it it might not be cheap. i'd probably go with one of the metal sets described above. since it is leaking water then the crack and repair isn't going to be subjected directly to the head of the combustion. I repaired a whole in water passage in a timing chain cover (about the side of the tip of a ball point pen) with JB weld on my old 66 mustang and is lasted for 2 years until i finally replaced the timing chain cover. and it was showing no signs of failing. also, you mentioned you ground into the crack. on fine cracks if you grind on it to try and look deeper into it, there is a tendency to "smear" the metal over the crack and mask the true extent of the crack (experience learned working with aircraft structures). Something to think about anyway. |
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Ritt
Member Joined: 20 July 2005 Location: Bethel CT Status: Offline Points: 1989 |
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Thanks for the replies..........I'll keep you all posted. Since I have everything completely turn down (except the engine) it will be at least a couple of months
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Rit
1948 2A, "RAISIN COOKIES THAT LOOK LIKE CHOCOLATE CHIP COOKIES ARE THE MAIN REASON I HAVE TRUST ISSUES" |
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waytay
Member Joined: 19 Sep. 2014 Location: maine Status: Offline Points: 45 |
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if possible drill a small hole at each end of the crack wit a small drill that will stop the crack from traveling farther then preheat the area and braze in the crack take your time and make sure area is perfectly clean this has worked for me on a couple of blocks om old fords so should work for you if you care totry this
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watay
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rocketeer
Member Sponsor Member Joined: 26 June 2008 Location: Lehighton, PA Status: Offline Points: 3473 |
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Look at the date, this is a 9 year old thread you have resurrected.
Larry |
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Lee MN
Member Joined: 13 Aug. 2008 Location: Harris, MN Status: Offline Points: 4923 |
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9 years, wow. I would lock&stitch it. a product machine shops use.
Lee |
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LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
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Jeff
Member Sponsor Member Joined: 23 July 2005 Location: NH Status: Offline Points: 852 |
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Yes indeed an old thread - and my 2A is still going strong with the repaired crack outlined above. Of course she probably has about 5000 more miles on her - lots of them plowing snow!
Jeff
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