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JB Weld, did it work?

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Gary

02-26-2004 09:01:01

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I read a string on here about using JB Weld to patch pits on a cam. I would probably never consider using the stuff on an internal moving part of an engine, but the article made me curious about the unusual uses of the product. Have any of you guys or gals ever used JB Weld on engines or in them? Do you have an interesting and/or helpful suggestion about the product?

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Seifdoggy2

02-26-2004 20:27:28

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Re: JB Weld, did it work? in reply to Gary, 02-26-2004 09:01:01

I can't believe all the good responses on JB. I have tried it on different things for 20 years. I put it on as carefully and cleaned as good as could be done.

It FAILED everywhere I tried it. You guys must be lucky. I think it is the next thing to worthless. It is worth a try though on some things. Seif.

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dlp

02-26-2004 17:44:47

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Re: JB Weld, did it work? in reply to Gary, 02-26-2004 09:01:01

The trick with JB Weld is to heat the metal up slightly. When you apply the JB, it will flow like water. This helps to really penetrate the pitted area & make it adhere better. I used this trick on my Model L sleeves where it was pitted in the area of the rubber seal. Let it set, sanded it down, good as new! I have never tried it in a cylinder, but I bet it would work fine.

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Dave

02-26-2004 17:25:10

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Re: JB Weld, did it work? in reply to Gary, 02-26-2004 09:01:01

Used it to patch a 2" round rust pit about 1/8" deep in the cylinder of an IHC LA engine.Sandblasted the cylinder,rolled the JB in with a piece of broom stick,let it set up,honed the cylinder smooth.Engine still starts and runs great at the shows I take it to.How long will it last? Haven't a clue.Didn't really expect it to work at all.Been runing for 4 summers worth of engine shows now.I all so brazed in huge pits in the valve seats too.

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BlueLite - JB Pressure Li

02-26-2004 14:36:04

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Re: JB Weld, did it work? in reply to Gary, 02-26-2004 09:01:01

I completely rebuilt the aluminum water jackets on the water pump housing of a ford 150 that was corroded badly. I sanded with a dremel the damaged sections then molded the thin walls and continued building them up until I got the general height of the wall. Then I sanded the whole gasket
surface flat with piece of plywood and sandpaper.

I polished and carved out the repaired sections with a dremel to the general shape of the original wall thickness. It was my friend's truck and he didn't have any cash. I expected it to last till his next pay. That was 3 years ago and he's still going.

I have a question though as I don't have the stuff anymore. What is the pressure strength of JB.? I'm thinking of using the stuff as a hydraulic seal(gasket) between 2 plates that are machined flat. Oil passes through a drilled passage between the 2 plates, pipe on one plate, a connector on the other. It would be thinly applied all around the edges for a box-in seal before bolting the sections togeather. I expect most will squeeze out to a few microns. Oil pressure will be 3000lbs. If it works it will be a cheaper substitute for Mylomar but won't be able to seperate the sections as you can with Mylomar.

thanks.

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Pete in PA

02-26-2004 13:50:22

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Re: JB Weld, did it work? in reply to Gary, 02-26-2004 09:01:01

I've got a front end loader on my H that I bought (cheap) that's got JB weld mounded up on one of the hydrolic cylinders. Works no problem - no idea how long it's been there, but I've had the loader for 3 yrs & worked it hard...

Pete in PA

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02-26-2004 13:44:56

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Re: JB Weld, did it work? in reply to Gary, 02-26-2004 09:01:01

Exhaust manifold of a '70 GTO 400.

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Markus

02-26-2004 12:54:39

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Re: JB Weld, did it work? in reply to Gary, 02-26-2004 09:01:01

I used it to seal up a crack on the intake manifold for my "M". It has been there 9 years and is still working perfectly.

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Theman

02-26-2004 09:53:42

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Re: JB Weld, did it work? in reply to Gary, 02-26-2004 09:01:01

Well let's see...there's the pin hole in the steel fuel line on my H where it rubbed on the front gas tank support..or maybe the hole in the bottom of the Donaldson air cleaner cup...and lastly, it has been great thread sealer for the stripped out fuel sediment bowl housing (pot metal) fitting for the gas line... Yup, all on the same tractor and no leaks. That was in 1999. However, I haven't had the nerve to try it on the rear main oil seal yet...

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Brian Schmidt

02-26-2004 09:10:59

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Re: JB Weld, did it work? in reply to Gary, 02-26-2004 09:01:01

Knew a guy once who patched a cracked cylinder sleeve on a on highway semi truck to get him back out on the road. His truck ran that way for another 150,000+ miles. Then it was time for a rebuild anyway not because the repair failed.

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Jonathan Mirgon

02-26-2004 22:36:25

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Re: Re: JB Weld, did it work? in reply to Brian Schmidt, 02-26-2004 09:10:59

I was never a believer in that stuff but your stories are pretty convincing, I have an H that smokes anyone konw of a good engine overhauler in a can ? HA HA

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Dave_D

02-27-2004 09:45:08

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Re: Re: Re: JB Weld, did it work? in reply to Jonathan Mirgon, 02-26-2004 22:36:25

I patched some pin holes in the top of my Dodge ramcharger. 2 Years and still working. Also, used it to patch a small crack in the botton of Case DC radiator. Worked there also. Trick it clean the surface. - Dave
Chico, TX

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