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Old March 14th, 2006, 01:37 PM   #1
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Default Repairing Plastic Tanks on a Radiator?

Hmm,

My car has a standard aluminum radiator with plastic end tanks. there's a spot where the plastic is molted to allow a nearby tube to botl to it. Just a little support tab.

Looks like someone leaned on that tube, and so right above the tab, there's a crack in the tank, about 2" long, more or less a straight stress crack.


Any way to repair this? With the radiator being pressurized, I'd assume that high temp RTV isn't going to hold...
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Old March 14th, 2006, 01:43 PM   #2
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Plastic Welding
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Old March 14th, 2006, 01:46 PM   #3
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Two part epoxy. Im sure there is one that meets your needs. That shit gets hot so use a tool not a finger like i did.................
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Old March 14th, 2006, 02:15 PM   #4
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Old March 14th, 2006, 02:26 PM   #5
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I searched and I guess there are some repair kits, so I'll give one of those a shot..

off to NAPA....
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Old March 14th, 2006, 02:50 PM   #6
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Wow......as the dagger twists deep into my heart :cry:.........it was a mear overkill suggestion to use a sodering iron to fuse the plastic together....that to me is better than any epoxy....especially on a non moving part.

p.s. you also will want to probably have some plastic on hand to add to the melting mess as in tig welding. This is how I have repaired some of my kids toys.

Last edited by Immortal; March 14th, 2006 at 02:54 PM.
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Old March 14th, 2006, 02:56 PM   #7
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Hehehe. I do heat staking/plastic welding at work, sometimes, on instrument cluster housings. But those are parts designed with extra casting. If I had some proper filler material, i'd try it.

I found a radiator repair kit at NAPA, its got a 2 part epoxy with fiberglass cloth for strength, and its designed for the end tanks specifically, so we'll see how that works.

I'll give a status update in a few days as this might be usefull to someone else..
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Old March 14th, 2006, 03:13 PM   #8
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JB weld!!! the box says you can fix a bull dozer block with it. The stuff does work really well. I used it to fix the tube coming out of the fuel pump on my old cougar and have used it to seal some leaks on my hot tub (and other misc stuff I cant remember). If you can rough up the plastic first so that it has something to adhere to.
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Old March 14th, 2006, 05:57 PM   #9
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i just finished with the radiator repair kit. It looks like it should work well. That was some EVIL epoxy..

Process was:

Clean
Sand to a rough texture
Cut and trim fiberglass matting to correct size
coat everything with eboxy
press in fiberglass
coat with a second layer of epoxy


Its a good 1/8" thick with the fiberglass supporting in there, hopefully my 1.5 angry liters of displacement don't blow it out :tonka:
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Old March 14th, 2006, 06:27 PM   #10
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evil how? stunk and got warm?

I used 2 paperclips and two part epoxy to repair the grand am after i got in a wreck. The plastic front was busted and epoxy bonded the plastics together. The clips were used to hold in place until set.
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Old March 14th, 2006, 07:31 PM   #11
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warm, smelly, and thick, just like my sons diaper..


It was VERY thick and sticky, almost looked like black rtv silicone.

This had the epoxies in a special pouch. When you squeezed it, it broke the seam between them, and you could knead them together. Once they were mixed, you just cut the corner and applied it like frosting..
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