Backdating an SC to SSI - Interferes with Omega Spring

[Racer Chris]

1983 911SC with newly installed SSIs. The omega spring wouldn't clear the exhaust so we did a search of the forum and found nothing about this.
We mounted the spring to the rear because that seems to interfere less. We dimpled the HE shell, seemingly as far as possible where the omega spring interferes but it still hits before the clutch is fully depressed.
Have others experienced this and what have you done to resolve the problem?
Is this something we have to live with?
Will it eventually wear a hole in the shell or cause an exhaust leak if we leave it as is?

[mickey356]

There is something in Waynes book about this, and yes, others have experienced this. I'm about to install SSI's on my car and I swear I read something about this on PP somewhere. I

[don gilbert]

I took the spring assy. and bracket completely off and used a throw out lever from an earlier 915. That spring is a real pain in the butt, I got tired off fighting it.

[brads911sc]

I just pounded the lip on the ssi flat at this spot and let the omega spring rest against the exchanger. two years.. no issues..

[john walker's workshop]

Originally Posted by brads911sc

I just pounded the lip on the ssi flat at this spot and let the omega spring rest against the exchanger. two years.. no issues..

just figure out where it's interfering and grab the lip with visegrips and bend about 2" of the lip down, then finish with a hammer.

[WIL84911]

Is that what it's called? Yeah... hammered my nice SS exhaust for that sucker.. No issues so far....

[Racer Chris]

Originally Posted by john walker's workshop

just figure out where it's interfering and grab the lip with visegrips and bend about 2" of the lip down, then finish with a hammer.

That's exactly what we did at the outset. It appears the shell is already against the pipe inside and there is still a little interference. At least it isn't enough that it will get stuck.

[Racer Chris]

Originally Posted by WIL84911

Is that what it's called? Yeah... hammered my nice SS exhaust for that sucker.. No issues so far....

Thank you for the picture. That helps. We have the spring on the other side because when we started with it like you show, the interference was much worse.
But it looks like, if we shorten the cable a bit more (as you show it) it will start from a spot that doesn't interfere.
My question in that regard though, is - is the omega spring still helping out once your clutch is depressed?

[john walker's workshop]

the spring returns the long arm to rest at the stop tab above it. you can't adjust the cable right unless the long arm is against it's stop. sometimes the stop tab has broken off and the arm goes too far back.

[Racer Chris]

Originally Posted by john walker's workshop

the spring returns the long arm to rest at the stop tab above it. you can't adjust the cable right unless the long arm is against it's stop. sometimes the stop tab has broken off and the arm goes too far back.

This trans has no stop, never did. Its not the first one we've seen like that.
The clutch feels over-center in roughly the right position as it is right now, but in order to move the arm further forward we have to shorten the adjustment at the pedal some more. A new cable was just installed with the clevis positioned as it was on the old cable.

Edit: I guess it did have a stop at one time. The broken screw ends are pretty well crusted over.

[WIL84911]

If it helps... what I noticed is that if you separated the spring from the exchanger with a big flathead screwdriver it stays there for sometime. So I tend to think no issues will arise and it's possible to make it stop right before it hits the exchanger....

[Racer Chris]

It looks like we got it!
Thank you for all the helpful replies.
Shortening the cable as much as possible at the pedal end allowed us to position the arm such that the spring can be installed on the front side. It does not touch at any time now.