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11-20-2011, 03:53 PM | #1 |
Senior Member
Join Date: Dec 2010
Location: Ferndale, WA
Posts: 107
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cracked block repair
When I first rebuilt my engine I found a crack in the block and had it welded, but when it was reasembled it still leaked. I asked for suggestions on the forum and was told to try JB weld. So the second time I rebuilt my engine from a bad babbett job I heatted up the area of the crack with a torch to make sure it was totally dry and used my dremel to roughen up the area and applied the JB weld. It has about 3000 miles on it now and is holding up fine.
Thanks for the advice |
11-20-2011, 04:01 PM | #2 |
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Join Date: May 2010
Location: H.B. California
Posts: 451
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Re: cracked block repair
Al, congratulations on that fix.
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11-20-2011, 04:29 PM | #3 |
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Join Date: May 2010
Posts: 1,369
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Re: cracked block repair
Non-pressurized cooling systems definetly have they're advantages.
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11-20-2011, 04:38 PM | #4 |
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Join Date: May 2010
Location: Santee, California
Posts: 3,505
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Re: cracked block repair
Happy for your success! Great stuff isn't it. I'm always finding new things to do with it.
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11-20-2011, 04:48 PM | #5 |
Senior Member
Join Date: May 2010
Posts: 4,179
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Re: cracked block repair
Hi Al,
J. B. weld & similar products are great for similar applications. Cutting "slight" recesses in sides of metal joints with a Dremel tool, or drilling in "slight" recesses in sides of joints with a drill, or forming joints similar to dovetail joints can greatly increase material attachment & holding power. If one were to investigage many material application failures, one would often find improper surface preparation & improper cleaniness of metal surfaces. |
11-20-2011, 05:44 PM | #6 |
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Join Date: May 2010
Location: Cincinnati, OH
Posts: 209
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Re: cracked block repair
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11-23-2011, 05:50 PM | #7 |
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Join Date: Oct 2011
Location: Reynolds Sta. Ky.
Posts: 106
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Re: cracked block repair
i bought a 8n ford tractor back in the 70's, with a hole in the block and the connecting rod was sitting on the block and oil pan flange, rod cap gone. The hole was about 1 1/2 ", my uncle and i welded it using a 3/16" steel plate to fill the hole, we used stainless rod arc welding, i was welding about 1/2" at a time my uncle was cooling and peening with ball peen hammer, worked like a champ, we also used a material simler to jb weld, it's still there, no problem, this was not in the water side of the block .
jim, ky |
11-30-2011, 01:33 AM | #8 |
Junior Member
Join Date: Nov 2011
Location: Beverly, MA
Posts: 3
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Re: cracked block repair
The only reason a weld would crack is if the person who had welded it for you did not use the proper cast iron rod. I have seen this in all areas of fabrication through the years. "Look, I used the mig and it's holding fine". Thats when i would whack whatever it was with a hammer or mallet to prove my point and walk away laughing.
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11-30-2011, 07:20 AM | #9 | |
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Join Date: May 2010
Location: Bucks Co, Pa
Posts: 3,740
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Re: cracked block repair
Yeah and no, Kenny, I've welded some stuff together with Ni-rod some held and some didn't and I've welded some stuff with S.S. rod and it worked fine and some didn't. A lot depends on the iron and how contaminated with carbon it is. The best one I ever ran into was a Cat. head that was cracked. So my friend Bill heated it to 1200 deg. and poured 6010 into it. 6010 is a very violent arc and it will burn out a lot of carbon. AFAIK, It's still holding. With C.I., you've got to be flexible.
Terry Quote:
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11-30-2011, 09:26 AM | #10 | |
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Join Date: May 2010
Location: Pitt Meadows BC
Posts: 1,003
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Re: cracked block repair
Quote:
Cheers! |
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11-30-2011, 07:12 PM | #11 |
Senior Member
Join Date: Oct 2010
Location: 40 Mt.Vickery Rd. Southborough,MA 508-460-0733
Posts: 352
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Re: cracked block repair
Here's what happens when JB weld goes wrong.
It seems someone tried to fix this block with JB weld,then braze and then try to pin it . They threw everything at it but the kitchen sink. It was a mess. The one thing no one has mentioned on this post is "metal stitching" which we do here successfully and have repaired this block doing so. Once the repair is done it isn't obvious under the paint. http://www.jandm-machine.com/metalStitching.html |
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