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J.B. Weld block

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MGM

02-03-2003 06:45:13

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Looking for opinions. I have a hairline crack in my 930 case block between cylinders 3 and 4. The small divider between the 2 cylinders goes down about 2 to 3 inches. I ground both sides of this crack, cleaned with alcohol and put on J.B. Weld. I let it sit for 2 days and checked it with a wire brush and grinder and its on to stay. I have been getting mixed reviews on weather it will work or not. The crack is such a fine fracture crack you cant feel it with your fingernail. So far I gotten many more positive than negative reviews. Im looking for closure to make sure this will work. Thanks for all your inputs.
MGM

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MGM

02-05-2003 03:09:06

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Re: J.B. Weld block in reply to MGM, 02-03-2003 06:45:13

Gentlemen
After dozens of mixed reviews which were all very good I have talked to a professional welder. As you all know cast iron is very difficult to weld. He stated that because cast iron is very pourous that the J.B. weld will sink into the metal, not a bad thing but hard to clean out when welded. We are going to preheat to 600 degrees and use an infra red thermometer to check temp then clean and ni cad (mig)weld. Im sure I will sleep better at night knowing I did everything I could to fix this right. I had nightmares about taking it all back apart. After all It has been a project now for 1 1/2 years. I have read several comments ranging from dont worry to worry. One guy stated that he fixed a block over 4 years ago and still running strong with J.B. weld. Thanks to all of you for your support. John S. and all I value your input and please dont feel im going against your opinions. I think the world of all your help. Worrying got the best of me.
MGM

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C. Amick

02-04-2003 14:16:45

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Re: J.B. Weld block in reply to MGM, 02-03-2003 06:45:13

I am told that it will not hold. The heating and cooling will crack the J.B. Weld. If possible it should have been ground out and welded with perhaps a mig welder to hold it together. Any pin holes that were left should have been sealed with J.B. Weld.

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JIMVA

02-04-2003 16:48:02

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Re: Re: J.B. Weld block in reply to C. Amick, 02-04-2003 14:16:45

On the back of the JB weld package i remember there used to be a customer feed back story on there where this guy in TX i think, used to JB to fix a cracked block in one of his tractors or backhoes or something, 8 years ago this was in 2001 one when i seen that on the package, its some good stuff, i used it on a cracked propane grill lid, and its still holdin with the heating and cooling, and that was 2 years ago, and this crack was 8 inches from the base of the lid to the middle.

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John Mcminn

03-18-2003 20:09:18

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Re: Re: Re: J.B. Weld block in reply to JIMVA, 02-04-2003 16:48:02

Im trying it on a cast iron heater,worked good on a ford f150 radiator,you really have to use a shitload of it,to spread out over the surface of the repair,it's hit or miss.MIG welding and the J.B. would be better. If you do a search on "plumbing epoxy underwater"on google.com you'll find a WHITE PASTE EPOXY listing. A full pound of it is like,15 bucks + 7$ shipping,it's as good if not better than J.B. weld . OH YEAH the "right tool.com"website has it.

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John Mcminn

03-18-2003 20:06:47

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Re: Re: Re: J.B. Weld block in reply to JIMVA, 02-04-2003 16:48:02

Im trying it on a cast iron heater,worked good on a ford f150 radiator,you really have to use a shitload of it,to spread out over the surface of the repair,it's hit or miss.MIG welding and the J.B. would be better.If you do a searh on "plumbing epoxy underwater"on google.com you'll find a white paste epoxy listing a full pound of it is like,15 bucks + 7$ shipping,it's as good if not better than J.B. weld .OH YEAH the "right tool.com"website has it.

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MGM

02-04-2003 03:09:32

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Re: J.B. Weld block in reply to MGM, 02-03-2003 06:45:13

Thanks guys
Appreciate the feedback. Have had a lot of mixed reviews but mostly positive.
MGM

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Richard davis

02-03-2003 19:50:35

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Re: J.B. Weld block in reply to MGM, 02-03-2003 06:45:13

MGM, I repaired a crack in the block of a 36 Allis Chalmers WC. The crack ran about 12" horazontal behind the manifold. I just Ved out the crack and place it in there. My Dad laughed at me and said that the tractor was junk and that it would'nt last. That was 14 years ago and that tractor is still being used in the spring and fall(Sorry Dad but who laughing now)lol.
Richard

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AZJack

02-03-2003 19:38:01

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Re: J.B. Weld block in reply to MGM, 02-03-2003 06:45:13

I think JB Weld will work fine for you. I would use the regular though. The fast setting does not have the strength of the regular. Force it in the crack by rubbing it with your finger. Do it from both sides if possible-sounds like you have the engine opened up so that you can. It also would not hurt to drill stop holes at both ends of the crack before filling.

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James

02-03-2003 15:56:16

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Re: J.B. Weld block in reply to MGM, 02-03-2003 06:45:13

Question is what will it cost you to tear it back apart and fix it right if the JB doesn't work. I think if it was my engine, I would have it fixed right while you already have it apart. One weld (if it is accessible) can't cost that much.

I have said good things about JB weld. I once took part in nearly destroying a rental car that we repaired with JB weld. We jumped an intersection with a mid 90's chevy corsica. The car was completely airborne, when it landed, the crossmember/engine oil reservoir cracked from the bottom nearly 8 inches up the side. When I got out and looked under the car, it looked as though someone had just pulled the drain plug. We used quickset JB weld to patch over the crack and drove the car from Dallas to Kansas City, returned it to the rental place and ran like h*&&.
This repair was on aluminum.

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John Saeli

02-03-2003 15:04:18

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Re: J.B. Weld block in reply to MGM, 02-03-2003 06:45:13

MGM; Adam is correct; The J.B. Weld is a good product and will work fine. That area is sealed by the head gasket and not subject to combustion pressure. Don't forget to retorque the head bolts when you first warm it up. Retorque by backing off bolt 90 degrees and bringing back up to torque, Good luck,John

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Adam Whitson

02-03-2003 09:25:38

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Re: J.B. Weld block in reply to MGM, 02-03-2003 06:45:13

I think that you have to try it. I have had good luck with that product. I might not try it on a piece of equipment that I needed all day each day. But a tractor that I might use 1-2 times a week, one that I didnt have to rely on to run each day all day, ya I think you will be fine.

ABW

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