Firewall Replacement

[mantta]

I am getting ready to take a firewall off of a junk "A" and put it on my 30 coupe because the one on my coupe is full of holes that are not supposed to be there. My question is the spot welds on each side, is there a tool for drilling them out or should I just use a drill bit? The one on the junk firewall is perfect without any extra holes it it. I plan on doing this with engine in place.
Thanks for any help!

[MikeK]

There are lots of different types of tools for cutting spot welds. My fav is a small rotabroach with a spring pin center. Just center punch where you want to go and cut through only one of the two sheets of metal just outside the weld- or go a little smaller and they usually 'pop' with a little help from a narrow putty knife. Rotabroach Link

[Charlie jeep]

Hi Mantta,
you mentioned on your post that had found a firewall without any extra holes.
I'm restoring my 28 and I would like to receive a photo of that firewall, because I need to check which holes are original in my firewall and which aren't.
Could you help me with a pair of photos?.
If you want send them to my mail.
Cheers and tks in advance
Charlie Saguier

[Jason in TX]

Charlie Jeep - A 1930 firewall is nothing like a 1928 firewall.

[Charlie jeep]

Many thanks for yout reply.
I'n my case is a little more complicate I have a RHD model A !!!!!!
My firewall still have a pair of clinch nuts. Any idea what are they for ?
Cheers,
Charlie

[BRENT in 10-uh-C]

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Originally Posted by Charlie jeep

Many thanks for yout reply.
I'n my case is a little more complicate I have a RHD model A !!!!!!
My firewall still have a pair of clinch nuts. Any idea what are they for ?
Cheers,
Charlie

speedo cable clip and terminal box to generator wiring clip.

[jw hash]

on your body that has the junk firewall just drill it out the spot welds with a drill rigth through your firewall. on the good firewall use a spot weld cutter or grinder do not drill through the good firewall, use the holes that you drilled in your good body to weld your good firewall in with,

[Greg Jones]

Something to consider-unless your firewall is swiss cheese, it might actually be easier repairing the multiple holes than swapping out the firewall. Changing out a firewall that has been spotwelded can be done, but it takes some finesse to keep from screwing it up. You really need to know what you are doing-not for the faint of heart. Just my two cents-I have seen so many buggered up removal jobs that it makes me cry.

[Roadster62]

How do you plan to weld the firewall to the cowl side pieces? is this a show car or driver? I'm in the process of rebuildinga '30 Roadster using Brookville cowl panels and an original firewall. I want the finished product to look like a factory unit and plan to rosette weld from the inside.

[Roadster62]

I'll second that! I just cut out filler holes from a junk firewall and welded them in, worked fine.

Originally Posted by Greg Jones

Something to consider-unless your firewall is swiss cheese, it might actually be easier repairing the multiple holes than swapping out the firewall. Changing out a firewall that has been spotwelded can be done, but it takes some finesse to keep from screwing it up. You really need to know what you are doing-not for the faint of heart. Just my two cents-I have seen so many buggered up removal jobs that it makes me cry.