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Old 04-27-2016, 05:40 AM   #1
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1969 27' Overlander
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Water tank filler cap

A new challenge has developed as the filler cap on the water tank seems to be fused on the pipe going into the trailer. I have applied WD-40 and a pipe wrench and it will not budge to the point that the outside aluminum would start to bend.

Any ideas how to get this thing unstuck?

Thanks,

John
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Old 04-27-2016, 06:21 AM   #2
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Ideas

1. Try spraying it with a product called PB Blaster (available at AutoZone, Home Depot, etc). Best product I have found for freeing corroded parts.
2. If that fails, you can try using a torch to carefully heat the metal which should break the corrosive bond.
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Old 04-27-2016, 06:35 AM   #3
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Word of advice about that water filler cap...
When you do get it loose, make it a habit to put it in your pocket (and nowhere else) every time you remove it from the filler neck. Inland RV stocks replacements in case you do what I did before I made this rule.
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Old 04-27-2016, 09:43 AM   #4
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Thanks, on my way to HD to get the solvent later today
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Old 04-27-2016, 10:54 AM   #5
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Those things can be a pain on ours, too. Wondering if a coating of bee's wax might help in the future.
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Old 04-27-2016, 11:02 AM   #6
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PB Blaster works great. But I wouldn't want it in my drinking water.

I'll bet the gasket has rusted to the filler neck. Boiling water has a way of loosening things like that.

To prevent future seizing, and as a measure of routine maintenance, the cap needs to be removed periodically. A light coating of vegie oil wouldn't hurt either.

Tom
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Old 04-27-2016, 11:43 AM   #7
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You know, another simple lubricant we have used is plain, unscented hand soap.
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Old 04-28-2016, 02:33 AM   #8
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Plumber's grease.
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Old 04-28-2016, 03:01 AM   #9
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White food grade grease.
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Old 04-28-2016, 07:42 AM   #10
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Well it is still stuck, and the PB Blast didn't have any effect, I'll try the torch later today, very frustrating.

I may wind up cutting it off, re-threading the pipe and get a new cap.

Thanks for the ideas.

John
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Old 04-28-2016, 09:47 AM   #11
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No fret. You can buy a new water fill neck with cap. I think that VTS may stock them, but shop around, including on ebay. And put some non-toxic lubricant on the new one.
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