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Firewall crack
Posted: Thu Aug 11, 2005 12:12 am
by Primm69
I know everyone has seen (or at least heard about) the cracks that occur on the firewall around the brake master cylinder, but...
...my new purchase (3 weeks ago) has the same cracking, but far worse than I have ever seen, around where the clutch master cylinder goes into the firewall.
Anyone ever seen this before? It took quite some time on a welder to repair.
Primm
Posted: Thu Aug 11, 2005 7:28 am
by 23yrRebuild
I fixed mine with a bracket.
RE:Firewall Cracks
Posted: Thu Aug 11, 2005 11:22 am
by S Allen
I have seen it several times. The firewall is a weak link in the pushing it recieves from both the clutch master and the brake master. On the 65 I will be putting the SR in the clutch master fire wall had cracked so badly that some one had put a piece of 1/8" plate steel in there and brazed it covering the cracks. I cut the whole mess out and will fabricate a replacement part out of thicker sheet metal. Not that unusual at all.
Steve
Posted: Thu Aug 11, 2005 9:47 pm
by SLOroadster
67.5s and later all seem to do it. Its because of the indent to make room for the dual master cylinder. Almost all the cars I have seen pre restoration sufferr from this. If you have a right hand drive car, they don't seem to have the issue. Get a brake brace from any of the vendors and you should be good to go. It will make the brake pedal feel much better.
Will
Posted: Fri Aug 12, 2005 12:34 am
by Primm69
SLOroadster wrote:67.5s and later all seem to do it. Its because of the indent to make room for the dual master cylinder. Almost all the cars I have seen pre restoration sufferr from this. If you have a right hand drive car, they don't seem to have the issue. Get a brake brace from any of the vendors and you should be good to go. It will make the brake pedal feel much better.
Will
Hmmmm. So since it's a 65 model and RHD, this shouldn't have happened!
Seriously though, we were trying to work out what could have exerted that sort of pressure around the clutch cylinder. The brake I can understand, but the clutch side? Everything in the car is original, including the clutch, so it's not like someone has put a big heavy clutch in it either.
Oh well, a steel plate and some serious welding seems to have fixed the issue. Did the brake side too, to maybe save myself some grief later on.
Primm