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Old 05-11-17, 10:11 AM   #1
Haddock
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Default JB weld

https://www.youtube.com/watch?v=n2Wp-7kqEKI

Is it really that good???
I would like to try some on a frost crack...
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Old 05-11-17, 11:02 AM   #2
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Only used it once on cast iron.(Not on an engine) I wasnt impressed. It does seem to have a lot of followers though.
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Old 05-11-17, 11:22 AM   #3
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Is it that good? No!

It's an epoxy-based metal putty; there are lots on the market. To put it another way; it's just fancy body filler. Yes, it sets very hard, can be sawn, machined, threaded, etc - but so can cheese!

If you have a frost crack, go and look for somebody who can do "metallock" stitching, which is a much better (permanent) repair.

MP
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Old 05-11-17, 11:28 AM   #4
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Yes, it is good. I have sealed cracks in Fergie tractor blocks with it. I prefer to use Q Bond if possible though, but that doesn't have the 'crack filling' properties of JB Weld. Quicksteel putty is also very good and a tube of that is kept in my box for rallies, it has got several folk out of trouble when their tanks or float chambers have leaked!

Pete.
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Old 05-11-17, 04:19 PM   #5
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A bloke i used to work with had to go & collect a friends car that had holed a piston on the continent. He said he wasnt looking forward to towing it back so he tried filling the hole with plastic padding. It worked, he drove it back. He was a real clever chap an inventor too. Sadly now passed on. He was going to try & sell the story to Plastic Padding dont know if he ever did.
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Old 05-11-17, 04:24 PM   #6
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Bronze welding is good for cracks in cast iron too. I have a Lister D that came with Bronze welding on the head. I also have a Rad cooled Fowler 1PDM that i bought with a "repair" in plastic padding. I raked it out & arc welded it. Lots of ways to do it.
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Old 05-11-17, 06:36 PM   #7
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Default jb weld

I will be trying it on some frost damage on my ruston.

if it can do this: https://www.youtube.com/watch?v=587RuL45jS8

I cant see frost damage being a problem.
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Old 06-11-17, 06:44 PM   #8
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I prefer Belzona to JB personally, but it has been used by many people successfully.

Martin is right that Metal Stitching is a superior repair, I would argue that it is a Rolls Royce repair.

..........And as an engineer within British Railways once said in reference to the Gresley V4's "they were a cracking loco, but they were a Rolls Royce built to do a Ford Car Job", such is Metal Stitching if JB weld can suffice.

Paul.
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Old 06-11-17, 07:37 PM   #9
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There is a thread on the forum about JB weld that I posted in,I've used it on my CS cylinder block to repair a frost crack and it has held well.just make sure you have a clean slot/crack. I ground the frost damage out with a grinder then a Dremel and broach,apparently JB weld doesn't work very well if any grinding residue is left in the crack.

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Old 06-11-17, 08:28 PM   #10
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Funny thing about JB weld, it is very popular in the USA, until a few years back it was almost unknown here, except to a few in engineering. We had a big stock at work as it was the required epoxy glue for a particular Boeing job, they supplied it. Obviously we all used to 'borrow' the left over supplies.
I used it a few times to glue fishing rod reel seats on, how surprised was I to discover it wasn't frost proof, as a cold night on the beach proved.
I have tried it a few time over the years, in it's different specs, it has worked some of the time, but mostly fails to impress.
There are other far better choices for repairing frost cracks, like one of the products from Devcon, all of these have impressed me, both as a glue, and epoxy bedding compound and as a strong 'filler' for cracks etc.

Neil.
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