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

Postby BigBill » Wed Jan 02, 2019 4:36 pm

I never tried it but you can stick weld with a 12 volt battery using jumper cables. Castiron arc rod. Or buy or rent a Lincoln 220 welder or a 110vt MiG?
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.

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

Postby Paul in NJ » Wed Jan 02, 2019 4:53 pm

Used JB Weld Epoxy on my bolster freeze crack and its holding up well so far 2.5 years and counting.

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

Postby ricky racer » Wed Jan 02, 2019 4:59 pm

Mine was brazed when I got the tractor. I was planning on using it for a snow plow tractor. Since the bolster supports the grader blade when it is front mounted I didn't want to trust the braze. I purchased a good used one from JP Tractor, one of our site sponsors. You never know what you're going to get when you purchase used parts but JP eased my mind because they Magna-Flux each bolster to check for cracks after it has been thoroughly cleaned and all tapped holes are chased to assure that each threaded hole is good, they prime it and it's ready to go.
Maybe you can repair it with the JB Weld and all will be good. If you are going to use it for plowing snow, you may want to replace it.
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Re: Fix frozen radiator bolster w/J-B Weld?

Postby inairam » Wed Jan 02, 2019 8:36 pm

The cracked bulster I had was on a cub loboy and was only going to be used for mowing. The crack was at the bottom and not along the radiator flange like I have seen. viewtopic.php?f=1&t=95514&hilit=bolster I thought JB weld was worth considering for this cub.

I thought about how I would do it with JB weld, I decided to do a really good job I would want to do it from the inside and outside and maybe even pull a vacuum on the opposite side to check for leaks and pull the epoxy deep into the cracks.

I decided if I had to pull the radiator to do the inside I was well into it and should replace it.

It is a lot of work plus - talk about hood creep - with the hood off and front end off you want to fix everything up front plus the steering plus, plus, plus, plus....

I wish I purchased from JP. Not that I have a concern about cracks but cleaning the inside to take the Glyptal was hard without a sandblaster. The electrolysis tank did a nice job on the outside but not the inside.

After I had the bulster out it sat at work for two years till last month when I took it to the scrap yard. One day our welding vendor was visiting to go over a job. I showed him the cracked bluster. He is a two or three man shop. He asked what the replacement unit cost. I said about $250. He said to get a replacement. To do a good job brazing or welding he would be well over that.
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