Fix frozen radiator bolster w/J-B Weld?

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capouch
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Fix frozen radiator bolster w/J-B Weld?

Postby capouch » Tue Jul 12, 2016 10:11 pm

I hope this isn't a FAQ; I looked and can't find anything.

My new old Cub came with a freeze crack in the "bolster tank" that sites under the radiator. The guy at the auto parts store says he thinks high-temperature J-B Weld would work to seal it, because "it's low pressure and pretty low temperature."

I am pretty certain that folks on this forum will know for sure. The local welding shop won't drive out to weld it, and I don't have a trailer to get it in to town.

Is it worth a try?

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Re: Fix frozen radiator bolster w/J-B Weld?

Postby Bob McCarty » Tue Jul 12, 2016 10:44 pm

I've seen that done before. You'll probably want to "V" out the crack so you have more surface area for the JB to stick to, and then clean it well. Most are brazed rather than welded because of the extra effort needed to weld cast iron.

Bob
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we need to think differently."
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capouch
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Re: Fix frozen radiator bolster w/J-B Weld?

Postby capouch » Tue Jul 12, 2016 11:05 pm

The crack could be described as a deformed u-shape, and it is as if you had scribed the outline and then pushed the whole thing down by about 1/32" inch. So I even wonder, after reading here a bit, whether the "Waterweld" paste might be a better gambit, pushing and forcing it (maybe with a pencil) into the crack?

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Re: Fix frozen radiator bolster w/J-B Weld?

Postby inairam » Wed Jul 13, 2016 6:17 am

less than $100 on ebay for a replacement

http://www.ebay.com/itm/Farmall-Cub-tra ... 1680560121
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Re: Fix frozen radiator bolster w/J-B Weld?

Postby ScottyD'sdad » Wed Jul 13, 2016 6:19 am

inairam wrote:less than $100 on ebay for a replacement

http://www.ebay.com/itm/Farmall-Cub-tra ... 1680560121


That is not a bolster, the bolster sits above that part.
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Re: Fix frozen radiator bolster w/J-B Weld?

Postby Stanton » Wed Jul 13, 2016 6:22 am

Think I would try either the Waterweld or the JB Weld product. Either will resist antifreeze/water, stop leaks and seal it up. If that doesn't hold, next option is get a replacement bolster.

I've seen JB Weld used successfully to seal and bond a lot of things.
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Re: Fix frozen radiator bolster w/J-B Weld?

Postby Eugene » Wed Jul 13, 2016 3:38 pm

Try the epoxy, long set up time.

Drain coolant and let bolster dry for a couple of days. Clean up the crack and surrounding area. Wash area with rubbing alcohol. Once alcohol has dried, heat area with propane torch to remove moisture/coolant from crack and warm up area around the crack. Apply epoxy to warmed up crack and surrounding area.

Observe and follow wait times listed on instruction package before putting bolster in use.
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Re: Fix frozen radiator bolster w/J-B Weld?

Postby tmays » Wed Jul 13, 2016 4:15 pm

JB weld will work just fine. Clean crack well, apply, and give it time to dry. Repaired one two years ago and still no leak
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Re: Fix frozen radiator bolster w/J-B Weld?

Postby ScottyD'sdad » Wed Jul 13, 2016 7:49 pm

I had a brazed repair that was weeping. Cleaned it, put JB weld on the outside, and sandblasted and used RedKote on the insinde, for extra sealing.
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