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Old 03-10-2012, 08:27 AM
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expanded dent issues

hey guys what should i do if i expanded the metal on my door and now the dent wont stay straight it either pops in or out thanks .

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Old 03-10-2012, 08:52 AM
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the metal is stretched so it needs to be shrunk. Metal is shrunk by heating it very hot then immediately cooling it with a cold wet rag. There are a number of ways to do it....I was originally taught with an oxy acetylene torch, I've tried a shrinking disk but can't get it to work well for me, there are tips for welders, but what I find works the best for me is to use my stud welder (just got a cheapie for $99 at HF since I don't use them often). I put a tip on but without a stud and use that to make my hot spot, then immediately cool with wet rag. You may have to shrink in several places and make multiple shrinks. I start in the middle of the stretched area. You will get some metal distortion.

I was shrinking an oil canny spot on my front valance and had to make about 6 contacts just to get that spot shrunk.
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Old 03-10-2012, 08:54 AM
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hey lizer would a propane torch work thanks !
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Old 03-10-2012, 10:10 AM
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I've tried a propane torch before and it did not work well. It does not get the metal hot enough or fast enough, and it just results in distorting the metal. I try to get the metal hot as fast as possible; I find distortion is minimal this way.
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Old 03-10-2012, 01:09 PM
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I was taught to use a torch and heat a small spot in the center of the stretch red hot then while hot with a body hammer tap the metal working from the outside edge of the stretch in toward your hot spot finishing up with hammer on dolly and cooling with a cold rag. Start on a scrap peice of metal. Make a stretch and shrink it out untill you get the hang of it.
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Old 03-10-2012, 01:22 PM
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You should first determine what caused the oil can. Is it displaced metal from working another area, or did you stretch the area where the oil can is?
If its displaced metal, then don't do anything to it, you have to work on the area causing the problem, when you get it right the oil can will go away.
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Old 03-10-2012, 04:14 PM
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"You should first determine what caused the oil can. Is it displaced metal from working another area,..."

+1

check the gaps around the door to see if the dent pulled the flanges in, making the door smaller than it was.

see if the skin is glued onto a guard beam, you may need to cut it free from the foam first. (reglue when done)

if everything is fine, the stud-gun trick works well.
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Old 03-11-2012, 04:41 PM
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A shrinking disc is awesome for fixing oil can dents.
Wray Schelin sells a good disc and video .
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Old 03-13-2012, 11:42 PM
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Quote:
Originally Posted by Chevymon
You should first determine what caused the oil can. Is it displaced metal from working another area, or did you stretch the area where the oil can is?
If its displaced metal, then don't do anything to it, you have to work on the area causing the problem, when you get it right the oil can will go away.
I agree. Shrinking should be the last resort. This especially holds true for hoods/ decklids/ roofs. In most cases I find that by working out the damage means to tighten up the oil can at the same time.
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Old 03-14-2012, 07:42 AM
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From the original post I assume he did some repairs and is saying in that process he stretched the metal.
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