Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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#178679 07/22/10 05:12 PM
Joined: Mar 2009
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Jay28 Offline OP
Backyard Mechanic
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I am fixing up my front fenders on my 28 Chevy and I noticed that one of my fenders has some streched metal on the top
front crown in front of the headlight bar mount, I tried to dolly it out a bit but with no results, it just keep's poping in and out.
Does anybody have any idea's on how I maybe able to shrink this area to bring it back to hold it's original shape.


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Last edited by Jay28; 07/22/10 05:14 PM.
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Jay28 #178694 07/22/10 06:24 PM
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Jay 28,
Heat with Oxy/Ace torch to dull cherry red. When it cools, it will shrink the metal that was heated from the center point of applied heat. You will have to work at it, to shrink the area, going back and forth between the dolly technique (expands the metal) and heat shrinking. Time and patience will prove a perfect result.
Good luck and let us know how it comes out.
Paul


"Bringing back the past, my own little way."
Sky1928 #178725 07/22/10 11:09 PM
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I saw a guy use a "shrinking disk " once. He was putting an edsel convert together out of 4 different body sections and used no filler or putty anywhere on his panel welds. Awesome work! The disk fits on a buffer and was made from a waved piece of stainless steel. Just rub it on the area and the disk hits just the high spots, gets them hot and then you wipe them off with a damp rag. they shrink like right now. He swears it was the best tool in his shop! Check a local auto paint supply store to see if they can get you one. His butt welds on the quarters looked like original stampings when he was done and I saw the car while it was still just bare steel.

Last edited by Bob_Kerr; 07/22/10 11:11 PM.

28 Chevy LO Capitol 1 ton, 28 National 2 dr coach, 71 Chevy Custom Camper 3/4 ton. Also 23 Oldsmobile Economy truck and a 24 Olds sport touring.
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Jay28 Offline OP
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Thank's Sky1928 and Bob_Kerr
I think I'm going to try the shrinking disk, just ordered one today, I am interested on how the shrinking disk will work out.
Bob do you know if This disk need's to be mounted on a buffer only with lower rpm, or could it be mounted on a grinder that has a higher rpm,or would this be to much rpm for the disk???
Once I try it I will post my results.
Thank's again


Keeping vintage Chevy alive.

Jay28 #178927 07/25/10 03:19 PM
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Not sure if he had it on a buffer or grinder. The company you got it from should know what to use.


28 Chevy LO Capitol 1 ton, 28 National 2 dr coach, 71 Chevy Custom Camper 3/4 ton. Also 23 Oldsmobile Economy truck and a 24 Olds sport touring.
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Shrinking using gas is really very easy.
Simply heat a spot (about 2-3cm diameter) in the centre of the high area to red hot. This hot spot will swell even higher because of the heat. Next quickly place a dolly underneath it and tap the red spot down flat with the surrounding metal.This compresses metal in the spot. Then quickly douch the hot area with water using a wet rag. One must be quick to avoid heat travelling too far from the hot spot. As it is cooled it will shrink and pull surrounding metal down with it. Once completed (several spots may be necessary over the raised area) the whole area can be dressed/beaten smooth to finish off.
It's got to be easy because even I can do it!
Geoff.


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