83 SC Clutch Configuration

[WildMuskrat]

Good Day everyone,

I am at a dead end with my 2 year Porsche project, a 83SC, new engine and clutch and rebuilt transmission. Did all the clutch adjustments straight out of the book. But when I press the clutch it looks like I am just stretching the cable. I have reviewed many posts on the forum, looked through the internet and watched videos on how this setup is supposed to work. Is the clutch supposed to push or pull the throw-out bearing? Looking at the parts diagram and the linkage set up, the current set up drives the fork towards the front of the transmission not the into the clutch mechanism. I am confused here. I must be missing something.

[Bob Kontak]

The way you describe it you would be pulling the pressure plate which is correct for an 83.

Here is an article from the tech forum that may help your comfort level. Looks like the old -71 and before- had push type.

Pelican Technical Article: Replacing and Adjusting the 911 Clutch - Page 1

My guess (and only a guess) is that there is something wrong outside of the transmission (omega spring orientation maybe?) that is not allowing the cable to do it's job.

Can you push the clutch pedal to the floor?

[psalt]

If everything is assembled correctly and depressing the pedal does not release the clutch, the first thing I suspect is the pedal shaft roll pin.

[Scott R]

Did you get the throwout arm behind the bearing where it's supposed to be?

[Vin-barrett]

Originally Posted by Scott R

Did you get the throwout arm behind the bearing where it's supposed to be?

+1

sounds like the arm isnt in the TO bearing

[WildMuskrat]

I have rebuilt the pedal assembly, new pin, in great condition, installed a new cable as well. I noticed in the picture that the fork is on the side of the starter, my is on the opposite side of the power shaft, the drivers side of the transmission. I can push it to the floor, but it does not feel like a clutch>

I will include pictures here shortly, I am looking to drop the engine this weekend and find out what I did wrong. Man, what a bone head move, worked long hours and lots of time to insure things got cleaned, replaced and built right... sheesh the good news is everything is clean and new, so there should not be any issues with getting the engine out.

[Flat6pac]

Now that you have had it together and taking it apart there is a possibility you ruined the fork. You need to measure the fork opening. It should be 75mm and if it reads 80mm, youve ruined it.
When you lower the engine down, you can reach across on the drivers side of the trans with a mirror and flashlight and look into the clutch through the port hole and confirm that the fork isnt in the TOB
Bruce

[trojwl]

My 1982 911SC had the exact same issue. Rebuilt tranny, new clutch assembly, new cable, and, like you say, it's like the cable didn't displace enough length to operate clutch (giving that "cable-stretching" appearance).

Rebuild your pedal cluster. The worn-out aging nylon bushings are worn out and the shaft is contorting. Since clutch pedal and cable bracket are farthest apart in cluster, the twisting really affects cable displacement. Get all the clips, pins, etc. It's a fun afternoon job.

Get the brass set from our sponsor.

I did it and now the clutch works fiine.

[WildMuskrat]

trowjl, thanks for the info, I have rebuilt the pedal cluster new pins and brass. By the way you car looks like mine same color , with sunroof but no tail. By the way what color is this called. I love the look with the black, get lot's of positive comments.

Flat6pac, thanks for the advice, i will definitely be working this thing back together with a fine tooth comb and making sure all components are within specs, any hint of problem and it get's replaced

[Bob Kontak]

Originally Posted by WildMuskrat

I noticed in the picture that the fork is on the side of the starter, my is on the opposite side of the power shaft, the drivers side of the transmission.

Your transmission does not look like this 81 915 regarding the orientation of the shaft and fork? You are saying it is on the other side?

[WildMuskrat]

Yes it is on the opposite side of the starter

[LUFTMAN]

check fork for hairline cracks by the arm area .very hard to see you may have to remove fork and put it in a vise and try to spread arms i have plenty of used forks if you need one. regards tom. good luck

[Scott R]

Your clutch arm is on the correct side for an SC, it's opposite the starter.

[Bob Kontak]

Call me a dunce but I am struggling with the shaft and fork being on the side opposite from the starter. I must be misunderstanding something.

[WildMuskrat]

Folks,

I apologise, I got my bearing mixed up here.

I was looking at the clutch arm assembly only, no paying attention to the fact that I was upside down and coming in from the rear of the car. Sorry for the mix up.

I did get the engine and transmission out , separated and got a good look at my error.

It was the fork not being in the throw out bearing groove as so many have suggested.

I am waiting on a new fork, which looked OK, but I don't want to take a chance.

Thanks for all your help in this, I guess the issue was not realizing it is a pull type clutch, no where in my manual does it mention this, threw me a curve ball and I was in a rush, really stupid things on my part.

Nothing time and good advice won't fix

[Scott R]

Is the fork OK? As mentioned above, make sure it doesn't have any cracks in, or that it's not bent.

[Bob Kontak]

Scott R - He said he is waiting on a new fork in post 15.

[Scott R]

Originally Posted by Bob Kontak

Scott R - He said he is waiting on a new fork in post 15.

Damn, thanks. Missed that.

[WildMuskrat]

Hey folks,

sorry for the delay, hope everyone had a great holiday season. Installed the new clutch folk, adjusted and Shazamm! it works, got to run it around the block a few times before the weather closed in on us here in Kentucky. appreciate the help. Now on to next 100 items to work on.