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Helmsy's Avatar
 
Join Date: May 2008
Location: South Australia
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Fixing or replacing is fine but it would be nice to know what actually caused it to eliminate it happening again.
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Ben
'85 930 - Black on Black
'95 993 Turbo - Silver
Old 07-02-2012, 08:09 PM
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I agree. Since I am replacing all the bushings in the front, I have a pretty good view from the bottom. I am not finding any damage elsewhere. This is also the first time I have had it up on my new lift so I am not able to say when it happened. I couldn't say whether it was before I bought it (2009) or after.
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Stephanie
'86 911 3.4L, SSI with M&K exhaust
'87 930 Andial IC, K27 7006, Tial WG, 964 Cams, 36mm intake, BLWUR, MSD6AL, .9 bar, RarlyL8 HDRs and muffler
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Old 07-03-2012, 03:35 AM
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Quote:
Originally Posted by PorscheGAL View Post
Folks

I found a crack on the crossmember subframe where the torsion bar retaining cap rest. Obviously, it will need to be welded, but how? Does the subframe need to come off or can it be welded in place?

I don't know how this could happen. I'm in the middle of a suspension refresh and found this problem.


Side view


bottom view
There is another crack in the top picture in the web of the piece that concerns me more. Problem with a crack, especially in an aluminum part that is susceptible to fatigue failure, is that once it is cracked it fails quickly.
You have to realize that the load from the torsion bar is reacted at the steel insert in the upper corner of the crossmember so you dont want it cracking in that area.
If it were me, I would go with the replacement piece and avoid using the welded piece.

fred
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, k27S turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),stock 4spd tranny
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 07-04-2012, 06:23 AM
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never

I would never trust a welded suspension part. Aluminum is a funny metal, especially when welding. Alot of heat is generated and the grain structure will be altered. I am sure many of these exist in the parts yards.

Good luck
Old 07-05-2012, 11:37 AM
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Old 07-05-2012, 11:37 AM
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