[DeTomaso] Hello Houston, we have a serious problem

[jderyke at aol.com]

Charlie, some but not all cracked magnesium wheels can be repaired- by experts. The first thing a competent repair shop will do is drill a 1/8" hole at both ends of the crack. This prevents the crack from unzipping like a torn plastic bag when its preheated for TIG welding. Otherwise, due to the very large heat-expansion rate of mag, you'll be chasing that crack all the way around the rim! Then they grind out the crack on both sides, and only then does the torch come into play. Once welded, a stress relief at 375 degrees F for a couple of hours should be done in Mom's kitchen oven. This will discolor any paint, incidentely so the rim will need repainting, If its an expensive, hard to replace rim, it may be worth doing. Otherwise, a new rim is your other choice from a safety/economics stamdpoint.  I've had rims successfully repaired by a certified aircraft welder, and I've had one that re-cracked in a new place a few months later. And do NOT let anyone talk you into using some sort of magic glue to 'fix' a crack. That is only for those with a death wish!
Good luck- J DeRyke 

 

 

 

-----Original Message-----
From: Charles McCall <charlesmccall at gmail.com>
To: detomaso <detomaso at poca.com>
Sent: Fri, Aug 21, 2015 11:11 am
Subject: [DeTomaso] Hello Houston, we have a serious problem


I noticed that I was losing air on a rear tire, so I took it off to
   take a
closer look.


   It would appear that my original Campy rim has a crack.
This doesn't
   look good.


   Is this something that can be repaired by a
competent shop dealing with
   magnesium or is this rim scrap?


   Any
suggestions? Thank you

 
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-------------- next part --------------
   Charlie, some but not all cracked magnesium wheels can be repaired- by
   experts. The first thing a competent repair shop will do is drill a
   1/8" hole at both ends of the crack. This prevents the crack from
   unzipping like a torn plastic bag when its preheated for TIG welding.
   Otherwise, due to the very large heat-expansion rate of mag, you'll be
   chasing that crack all the way around the rim! Then they grind out the
   crack on both sides, and only then does the torch come into play. Once
   welded, a stress relief at 375 degrees F for a couple of hours should
   be done in Mom's kitchen oven. This will discolor any paint,
   incidentely so the rim will need repainting, If its an expensive, hard
   to replace rim, it may be worth doing. Otherwise, a new rim is your
   other choice from a safety/economics stamdpoint.  I've had rims
   successfully repaired by a certified aircraft welder, and I've had one
   that re-cracked in a new place a few months later. And do NOT let
   anyone talk you into using some sort of magic glue to 'fix' a crack.
   That is only for those with a death wish!
   Good luck- J DeRyke

   -----Original Message-----
   From: Charles McCall <charlesmccall at gmail.com>
   To: detomaso <detomaso at poca.com>
   Sent: Fri, Aug 21, 2015 11:11 am
   Subject: [DeTomaso] Hello Houston, we have a serious problem
I noticed that I was losing air on a rear tire, so I took it off to
   take a
closer look.


   It would appear that my original Campy rim has a crack.
This doesn't
   look good.


   Is this something that can be repaired by a
competent shop dealing with
   magnesium or is this rim scrap?


   Any
suggestions? Thank you

_______________________________________________

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References

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