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> Outer Firewall R&R, Best Practice?
amfab
post Aug 12 2017, 09:55 PM
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Is the consensus that the best way to replace the outer firewall is to cut out old oneā€”cutting around tubes, then grind the remaining bits off the tubes until clean? Or is there some other way?

TIA

-Andrew
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BeatNavy
post Aug 13 2017, 05:40 AM
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That's the way I did it. If there is a better way, I'd like to know. It a fairly large PITA to get that piece off.

Here is a pic of mine with it almost all gone (except for where the tubes protrude). I saved the shift and speedometer outlets and braised those back into the new section. In my enthusiasm to cut I also severed one of the heater cable tubes and had to braise a repair to that.

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mb911
post Aug 13 2017, 06:25 AM
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Thats what i did as well but I cut mine in half as i have a 6 mount going on mine any way. I also left the top part in tact and sistered it up to the new piece and plug welded for additional strength.. Attached Image
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amfab
post Aug 13 2017, 09:23 AM
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QUOTE(BeatNavy @ Aug 13 2017, 04:40 AM) *


I saved the shift and speedometer outlets and braised those back into the new section.


Is brazing preferred to welding due to the thin tubing or can it be welded? Or are the tubes not steel?

Thanks for the responses

-Andrew
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mb911
post Aug 13 2017, 09:50 AM
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QUOTE(amfab @ Aug 13 2017, 07:23 AM) *

QUOTE(BeatNavy @ Aug 13 2017, 04:40 AM) *


I saved the shift and speedometer outlets and braised those back into the new section.


Is brazing preferred to welding due to the thin tubing or can it be welded? Or are the tubes not steel?

Thanks for the responses

-Andrew



Welding would be just fine..brazing puts a broader heat into a larger heat affected zone.. But either works.
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