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Old 07-01-2016, 02:48 PM   #1
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How I removed a dent in the front end cap

My Argosy 26 has had a beach ball size dent in the front end cap ever since I bought it.
I was successful in removing the dent using an inner tube, a piece of plywood and a home made fitting for the shop vac hose.
I placed the inner tube centered over the dent, then placed the plywood on the inner tube. Connected the shop vac hose to the fitting and turned on the vac.
The inner tube had about 5 pound of air, making it flexible and able to make a good seal with the plywood and coach skin.
NOTE: There were no creases in the dent.
I am not sure what the atmospheric pressure is at 4,200ft elevation. I know it is less than at sea level. I am guessing it is about 12.5 pounds per square inch. It's not the vacuum that restores the metal to it's original shape, it is the pressure from behind.
Isn't physics GREAT!
Sorry! the pics are not in order. Look at the last 2 first. Those are the before.

http://s1166.photobucket.com/user/do...Dent%20Removal
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Old 07-01-2016, 04:09 PM   #2
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Great Idea!

I think you can buy a gadget that is somewhat similar from princess Auto - it uses a large rubber suction cup and uses a compressed air hose and venturi device to draw a vacuum inside the cup.

I had a dent on top of the front cap of our trailer when we bought it used. I didn't know about it when we bought the trailer as it wasn't visible from the ground, so no big deal really.

I would expect it was caused by someone being up top and kneeling on the end cap - not a good thing to do.


I could have just left it as it was not readily visible but decided to have a try just to see if I could. It pulled out quite easily with a large suction cup (6-8" diam?) used for auto dent pulling - it worked fine but did leave the very slightest trace of a crease around the edges of the dent.

Brian.
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Old 07-01-2016, 04:23 PM   #3
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Wow!

I always thought I was a pretty good Hillbilly Engineer, but I am humbled by your innovation.

NICE WORK!
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Old 07-02-2016, 09:50 PM   #4
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I had a sizable dent in my front 13-panel endcap (on a 1956 Flying Cloud). After removing the interior skins, I used a partially deflated basketball (pushing from the inside) with good results. See here.

Hank
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Old 07-03-2016, 08:11 AM   #5
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Very clever idea there. Good job.

Perry
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Old 07-03-2016, 10:18 AM   #6
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Great idea TGT! I'll keep that one in my tool kit
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Old 07-03-2016, 11:12 AM   #7
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A fantastic solution with outstanding result.
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Old 07-03-2016, 02:24 PM   #8
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OK TG can you explain it again. I looked at the pictures and it came out great and we have a very similar dent. But I'm just not understanding your sequence.

Inner tube first, then wood, then blow up the inner tube, are you inside or outside.
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Old 07-03-2016, 02:54 PM   #9
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I love it! It sounds like something my dad would have devised. Simple, cheap and effective.
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Old 07-03-2016, 03:07 PM   #10
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How I removed a dent in the front end cap

Working from the outside.
Put 5'#'s or so of air in the inner tube. The tube in the pic is for a 15" tire. It is inflated enough to make it round and spongy.
Place the tube so that it encircles the dent.
Lay the plywood on the tube.
Connect the vacuum cleaner hose to the fitting in the plywood.
Press down on the plywood enough to get the tube to squash some.
Turn on the vac.
Picture the tube as the white filling of an Oreo cookie. The coach skin being one side of the cookie and the plywood the other side of the cookie.
I used a 16 gallon Craftsman vac with a clean filter. It has significant suction capabilities.
To test the setup. I laid the tube on the concrete floor of my shop (not smooth by any means). Laid the plywood flat on top of the tube. Connected the vac hose and turned it on.
The plywood sucked down, squashing the tube some. With the vac running I tried lifting the plywood off. It would not budge.
Thought to myself. "This might just work" and it did.
Hope this helps.
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Old 07-03-2016, 04:24 PM   #11
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Thx for the further information. So the suction is enough to lift out or suck up the dent. Thx
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Old 07-03-2016, 05:02 PM   #12
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Wow

WOW
Very cool
It's posts like yours that I love to see!
Wish pictures loaded on this forum easier
I'm going to try this, when I get some spare time
Thanks again!
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Old 07-03-2016, 05:46 PM   #13
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How I removed a dent in the front end cap

Under normal circumstance the atmospheric pressure is equal on both sides of the outer skin.
When you create a negative pressure on the outside of the skin with the tube, plywood and shop vac.
The atmospheric pressure is reduced, but the pressure on the inside of the skin is still the same. It is that ~ 14 pounds per square inch that actually causes the dent to push or pop out.
The higher in altitude you are the lower the atmospheric pressure. Therefor less push.
I live at 4,200ft in elevation. This method worked fine.
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Old 07-04-2016, 07:03 AM   #14
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Too simple... and it worked...

Quote:
Originally Posted by Hittenstiehl View Post
OK TG can you explain it again. I looked at the pictures and it came out great and we have a very similar dent. But I'm just not understanding your sequence.

Inner tube first, then wood, then blow up the inner tube, are you inside or outside.
I asked the same question..I felt he stuffed the inner tube into the roof area from the inside... When my friend TG wrote back I had to slap myself in the head as its so simple.. I have a dent on the rear cap of our Overlander I am going to rig up and try this same trick..

Thanks my friend TG for such a simple fix..

Sodbust
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