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Old 09-24-2011, 05:02 PM   #1
Solo Rvers Club
Join Date: Sep 2011
Location: Southwest Missouri
Posts: 64
cracked overflow tank

I found a cracked seam in my radiator overflow tank. It is that white plastic commonly found in tanks and washer tanks.
Is it possible to weld those? I have heard that you can friction weld plastic with a drill and rubber sander disk without sandpaper on it.
If thats not possible I guess I will be searching for a compatable sized tank in the salvage yards. Surely not a hight cost item.

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Old 09-24-2011, 05:58 PM   #2
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Posts: 133
For what it's worth, I fixed a pretty bad crack in the washer fluid tank of my truck with 3M 5200 adhesive. It takes 3-4 days to cure but is still holding several months later.

Just sand, clean with acetone and cover with the 5200. Do not disturb or refill for as many days as possible. If it's a crack, rather than a split seam, drill a small hole at each end of the crack which will stop the crack from running.

You can get the 5200 at West Marine or even some Walmarts.

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Old 09-24-2011, 06:14 PM   #3
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If the tank is pressurized, I'd say all bets are off. If not, you may have a chance with various types of repairs. I have had some luck with repairing plastic cracks by runnig a 100 watt soldering gun down the crack. It melts and fuses the plastic. Practice with some scrap first.
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Old 09-24-2011, 06:24 PM   #4
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Join Date: Sep 2011
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bluepill, its not a pressurized tank it just catches overflow and as the radiator cools it siphons it back into the radiator.

peddler, I think I will try both of your ideas. run a solder iron to weld it then cover it with 5200.

sounds like a plan to me. Now I have to carry it out.
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