winabbey wrote:
Hi Alex,
It's the ex-NSW Police MK II S that I bought on eBay a few months ago that's in need of some body repair. Specifically a new right guard, flitch and A panel plus a few minor dents to remove. I've used my arc welder in an amateur sense for many years with good results but I haven't done bodywork which I understand would be best done with mig - right? Of course a proper spot welder job would be better from an authenticity viewpoint as I'm trying to keep it as original as absolutely possible.

Cheers,
Hi guys,
I’m at it again. I just got this question, so with winnabey’s permission I am posting the answer
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Another “Phat Kat’s guide to body perfection In 8 easy steps or less”
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1. remove the side seam cover. It may require a motivational speech to get it off, and at the top where it meets the drip rail you will need to grind it off (or heat it up,, they are just brazed on)
2. unbolt and remove the latch panel for the bonet locking mechanisim.
3. remove the indicator light
4. remove the head lamp and bucket
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Ok from here you are ready to start removing the panel
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1. start at the A panel/pillar seam. You can tackle it 2 ways
a) using a spot weld cutting bit, drill the spot welds out until the flange is free
b) using a cut off wheel, cut the panel off just in front of the seam, (about 1/8" in front) and then using a grinding wheel remove all remaining traces of the flange from the seam. If you don't remove it all, the new panel will not line up correctly
2. Sit down inside the wheel arch. Look towards the front of the car. You should be able to follow the panel all the way to an internal flange close to the back of the indicator. Remove the guard from the front valence in the same manor used on the seam
3. Stand up and move to the front of the car. If you look at the provision for the head lamp, there is a couple more spot welds there to remove
3. look along the top edge of the panel. With the bonnet (preferable removed) look at the channel that the edge of the bonnet sits in, this is the last place the place where the welds need removal. I tend to just cut the panel off and grind it back at this point. I find it easier.
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Time for the new panel
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Regarding your question about welding... well... most people prefer MIG because it is "easier"... me I use Oxy. It has a lot of advantages (probably only relevant if you can hand form). But if you want an original looking repair, one that looks spot welded with out buying a spot welder, I'd say braze it. Its what we do in the resto industry if you don't have a spot welder. You drill holes (5/16") thru the flange faces where you want to "spot weld it", then fit it to the car clamp it, and braze inside the holes.
1. Hang the new panel on the car from the channel for the edge of the bonnet
2. Push it back till the flanges for the A panel seam are mated
3. Using 4 sets of vice grips, clamp the flanges together
4. Examine the gap between the scuttle panel and the front guard, make sure it is a consistent gap. It shouldn’t get wider at either end. Re position Vice grips if need be.
5. Braze your “spot weld holes” in along the A panel. I would suggest a number 6 tip or a number 8.
6. Position the flange inside the channel for the edge of the bonnet and braze it on
7. Do the same for the flange inside the head lamp hole
8. Finally the one inside the wheel arch.
9. Using Deoxidine and steel wool, scrub the living day lights out of the welds. You MUST remove all traces of the flux, OR THE PAINT WILL NEVER STICK. Wash the deoxidine off with metho and do it again just to be sure then give it a final scrub with multi purpose thinners
It is important to follow that order of welding so that you can make adjustments as you go... you will need to. Think of it like you are “wrapping” the new panel onto the body.
There you go. Panel replaced.
Regarding the A panel, Marc put up this link ages ago. It is a textbook example on how to patch them. He does it exactly the same way I would, its just easier to show you than try and explain it
http://www.youtube.com/watch?v=Jv3NikZfx4E
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Again, if that only makes sense in my head say so and I'll re-explain. Have fun.