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  View original topic: How to renew rear body brackets
virtanen Fri Jan 06, 2012 3:40 am

Here's one example story how to renew split rear body brackets


Typical condition of the rear brackets


Mark backing plate placement


Measure the height to chassis


Open the spot welds, there is also an extra weld on the rear edge


Saw bracket off


Open spot welds to rear luggage tray


Remove old bracket


Open spot welds on backing plate


Backing plate remains removed


Place new backing plate according the marking made earlier


Drill positioning hole on corner when good metal there left. Here 2 mm drill.


Positioning hole.


Saw to good material


Rust


New repair panel with holes to luggage tray


Fitting the panel, some welds applied on sides. Before welding lift the body rear up, sorry no picture here.


Fit in the panel


Weld


Plug welds to luggage tray


Backing plate with plug weld holes


Spot weld paint on area where spots are coming


Place backing plate according the positiong hole made earlier. Here seen spot welds and plug welds


Spot welds on lower edge


Grinding


New bracket drilled for plug welds. This can also spot weld but this is critical welding and plug weld by MIG is more secure


Welded


Grind


On luggage area

johnshenry Fri Jan 06, 2012 8:00 am

Wow, very nice write up and pics! My only question/comment might be that prior to welding on the bracket, would it be a good idea to:

1) Bolt it down to the chassis with the rubber pad in place
2) Check the clearance (3.7mm?), this would be the compressed pad thickness
3) Clamp the bracket firmly to the backing plate
4) Plug weld.

??? This would (further) insure that the position/angle of the bracket is correct. This may not be an option if someone is doing a full body-off resto.

Thanks again, posts like this make this forum far more valuable.

bwaz Fri Jan 06, 2012 9:24 am

johnshenry wrote:
1) Bolt it down to the chassis with the rubber pad in place
2) Check the clearance (3.7mm?), this would be the compressed pad thickness

For that rubber spacer, (body pad?) I somehow remember from my previous zwitter that it was thicker than the later style ones... the one on my car now looks thinner than what I thought it should be. The ones I see offered by WW for the, "lower, body to front axle front beam" look more the thickness I'd expect. Are the older ones thicker or the same later model ones?

thanks
Brian Waz

splitjunkie Sat Jan 07, 2012 7:07 am

johnshenry wrote: Wow, very nice write up and pics! My only question/comment might be that prior to welding on the bracket, would it be a good idea to:

1) Bolt it down to the chassis with the rubber pad in place
2) Check the clearance (3.7mm?), this would be the compressed pad thickness
3) Clamp the bracket firmly to the backing plate
4) Plug weld.

??? This would (further) insure that the position/angle of the bracket is correct. This may not be an option if someone is doing a full body-off resto.

Thanks again, posts like this make this forum far more valuable.

I always enjoy seeing your work Mika.

He measured the spacing before and it was 3.7mm so I would assume he made sure the new one was at that measurement.

The problem with bolting it on at it's final position is that there has to be a certain amount of crush of the rubber mount so the final position is less than 3.7mm. This will put the body under a slight amount of tension at that point. If you bolt it to it's final position before welding, the body will not have this tension so the mount will actually not be in the correct position.

virtanen Sat Jan 07, 2012 7:29 am

Thanks for your comments, here you can see the original rubbers of this October 1951 made split. The bracket rubber thickness seems to be 8 mm (the inner end was not between chassis and body), and crushed down to 4 mm.

The other pad rubber under back seat is maybe also 8 mm?









johnshenry Sat Jan 07, 2012 7:48 am

splitjunkie wrote:

The problem with bolting it on at it's final position is that there has to be a certain amount of crush of the rubber mount so the final position is less than 3.7mm. This will put the body under a slight amount of tension at that point. If you bolt it to it's final position before welding, the body will not have this tension so the mount will actually not be in the correct position.

I see your point. Along the same vein though however, the "no rubber pad" measurement is probably not realistic as it will depend on the situation of the rest of the body, are the other points on pads or not, etc. The fact that Mika marked/scribed the location of the old backing plate is probably sufficient, but I would still apply a bolt to the chassis before final welding and perhaps just re-inert the original crushed pad if I were doing this with the body on the chassis.

Dennis74 Mon Jan 09, 2012 1:06 pm

Nice work Mika :D

Dennis



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