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Cracked engine block

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68mustang View Drop Down
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Joined: 17 Jan 2020
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    Posted: 17 Jan 2020 at 11:15am
Allis chalmers 1939 wc bought tractor with engine block is welded , it runs perfect, it seaps coolant one area where it was welded, should I grind it down and try to re-weld, the weld looks very ugly.
Should I just look for another block assembly with crank ?
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LouSWPA View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LouSWPA Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 11:36am
nothing ventured, nothing gained. the trick to welding cast is to use torches and preheat and then after welding slowly cool it down with torches, and/or wrap in old heavy blankets so it cools slowly
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clay Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 12:05pm
If the block is now solid, clean and seal the weld with Belzona 1111 Super Metal.
1. Remove all traces of oil and antifreeze.
2. De-grease the surface with acetone or MEK.
3. Sweat the area with a torch. This will help bring the oils out of the pores of the metal.
4. Degrease.
5. V out the crack and roughen the surface.
6. Degrease.
7. Apply Belzona 1111 Super Metal to the area.
8. After the Belzona has cured, sand and paint.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ac fleet Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 1:17pm
I put Aluma seal in one. Never leaked since.  Had one with JB plastered on it, that didn't hole for long. Good cleaning before application is the key to anything holding.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lonn Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 1:24pm
This guy doesn't know much about a WD but he seems to know his welding. Welding cast iron without preheating and no cracks.
[TUBE]Yopcz-IYDyQ[/TUBE]


Edited by Lonn - 17 Jan 2020 at 1:24pm
-- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... -
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnkc Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 3:03pm
yep! what Clay say's. there are many boat engines out there " fixed"{LOL] that way.
I support the development of hybrid automobiles and alternative fuels as I need DIESEL fuel for my ALLIS CHALMERS!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PDehring Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 6:03pm
X2 on Belzona, I fixed my M block with it and worked great.  Not cheap though.  
1937 M Crawler, 1963 D21, 1964 D21, 1965 D12 SIII, 1970 220, 1976 185
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 6:08pm
Where's the leak/welded area?
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68mustang View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 68mustang Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 8:05pm
the repair is right along the carb. and intake rubber hose , don’t know how to post pictures in this forum.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 8:15pm
There have been many of those blocks successfully repaired by drilling 1/4" holes in the block on both sides of the crack and threading the 1/4" holes and mounting a 3/16" flat plate to the side of the block with a gasket and plenty of RTV or Permatex glue in-between.  It adds strength to the cracked area and works better than welding.  Looks bad ?? Well, how good does a bunch of weld look that seeps coolant all the time ??
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dawntreader74 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 9:42pm
DR; your wright on the patch' works very well' fixed one the same way' i put some JB; with a gasket' still never leaked been 10 years on WC.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave(inMA) Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 10:15pm
My C was declared dead by a PO after it threw a connecting rod through the carb side of the crankcase. Another fellow who happened to be a terrific farm mechanic made a patch using a piece of soft metal which he formed to the shape of the crankcase. He then drilled and tapped holes in the crankcase about every inch and bolted the patch & a gasket onto the side of the block. He ran that engine for years until I bought it from him. No welding required!
WC, CA, D14, WD45
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GARY(OH/IN) Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2020 at 12:07am
I patched an Oliver 88 with JB and it never leaked again for the several years I owned it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cottonpatch Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2020 at 12:56am
Originally posted by Clay Clay wrote:

If the block is now solid, clean and seal the weld with Belzona 1111 Super Metal.
1. Remove all traces of oil and antifreeze.
2. De-grease the surface with acetone or MEK.
3. Sweat the area with a torch. This will help bring the oils out of the pores of the metal.
4. Degrease.
5. V out the crack and roughen the surface.
6. Degrease.
7. Apply Belzona 1111 Super Metal to the area.
8. After the Belzona has cured, sand and paint.


Belzona 1212 is a better fit as it’s oil tolerant so you don’t have to sweat it. Also available in smaller kits, and it’s one to one base to solidifier versus 3:1 for super metal. Both good products.
'52 CA, '61 D10 II, ‘61 D15, '66 D15II, '63 D17D III, ‘69 170, '73 185 Crop Hustler, '79 185, '79 7000, '77 7040
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2020 at 5:24am
The metal patch idea works pretty good, for large holes, drilling, and tapping, too. I hadda jeep that I fixed with jb weld, crack was along the bottom of the water jacket, perilously close to the oil gallery.  Its always a good idea to borrow or rent a magnaflux unit, to see how far the crack(s) go.  Drill a hole, at the ends, tap and thread in a bolt, at all ends, to keep the crack from growing, taking care not to drill too deep, and into a moving part.Wink

Then there's this:

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerald J. Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2020 at 9:33am
Nevada Cylinder Head shop on the west side of Nevada, Iowa welds blocks often. They also can straighten crank shaft bores.

Gerald J.
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