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-   -   Clutch adjustment - pedal not fully returning? (http://forums.pelicanparts.com/porsche-911-technical-forum/1058995-clutch-adjustment-pedal-not-fully-returning.html)

proporsche 04-27-2020 10:26 AM

still..way too much space...plus when you touch the cable is the Omega spring have the tendency to move -it does not look like it??..there is no tension on the cable at all....have a look above-earlier, how i do the adjustment..

Solamar 04-27-2020 10:26 AM

Quote:

Originally Posted by Locker537 (Post 10842034)
I will try and fix the L-bracket, but will purchase a new one if needed. Unfortunately it does not appear you can purchase just the little piece that screws on.

I've got an extra L bracket. If you get stuck we can work something out.

Locker537 04-27-2020 10:28 AM

Quote:

Originally Posted by Solamar (Post 10842081)
I've got an extra L bracket. If you get stuck we can work something out.

Thank you for the offer! :cool:

Solamar 04-27-2020 10:37 AM

I'm sure this was already addressed, but are your doing the two stage adjustment?

Step one with the cable slackened or un-hooked -

http://forums.pelicanparts.com/uploa...1588012420.jpg

Step two, re-attach and pre-load the cable -

http://forums.pelicanparts.com/uploa...1588012548.jpg

Locker537 04-27-2020 10:39 AM

Quote:

Originally Posted by Solamar (Post 10842106)
I'm sure this was already addressed, but are your doing the two stage adjustment?

Step one with the cable slackened or un-hooked -

http://forums.pelicanparts.com/uploa...1588012420.jpg

Step two, re-attach and pre-load the cable -

http://forums.pelicanparts.com/uploa...1588012548.jpg

Yes, and I believe I am doing it correctly, but at this point I've lost confidence.

I thought the video I posted above looked proper, but Ivan disagrees. :(

proporsche 04-27-2020 10:49 AM

i have never done clutch adjustment by reading books ,sorry;-) i just go by what i know and what i learned from my mentor, back in the early 1980......we did not have the time to read we just worked together, sometimes overnight on engines so he passed the knowledge to me by working on 911`s
Ivan

Solamar 04-27-2020 02:31 PM

Quote:

Originally Posted by stevej37 (Post 10837792)
Yes..definitely. I had my 84 in the shop a few years back after experiencing the same thing. Tried over and over adjusting the cable. Clutch was working...the cable just wasn't working right.
I got it back and the mechanic said it was a $5 part..(plus 2.5 hours of labor)
He said it was the pin in the pedal cluster for the clutch. With age, it wears down enough to give the cable too much slack, at times. He said he sees it often.
Been working perfectly since.

Edit: Just checked my receipt....$170 for part and labor. Fair price I figure. The receipt didn't state the pin part number.

Hopefully the OP doesnt have this issue, but that was the beginning of my clutch engagement rehab.

This is the "$5 part" that your mechanic was probably referring to. It attaches the clutch cable to the clutch pedal cross shaft -

http://forums.pelicanparts.com/uploa...1588026507.jpg

Which chewed up my pedal cross shaft which led me to completely rebuild the pedal box and replace the clutch cable -

http://forums.pelicanparts.com/uploa...1588026507.jpg

Locker537 04-27-2020 02:45 PM

My pedal cluster looks good. :)

pmax 04-27-2020 08:24 PM

Quote:

Originally Posted by proporsche (Post 10842078)
still..way too much space...plus when you touch the cable is the Omega spring have the tendency to move -it does not look like it??..there is no tension on the cable at all....have a look above-earlier, how i do the adjustment..

When the cable's too loose as in the vid, the omega works "fine". When the cable's per spec, the omega's too weak. I believe that's what I'm hearing from Ivan.

carreradpt 04-28-2020 10:15 AM

Locker, just my view. After setting up the cable and all adjusted best as you can, go to the front. Is the pedal all the way up? If not, pull your pedal all the way back and then take a look at where the cable attaches to your cluster. Adjust the slack out at that end. See if that cures your issue. Just a thought.

Locker537 04-28-2020 10:35 AM

After having dreams about cable adjustments, I decided to stop tinkering with it for a day or two. :)

I'll get back at it and post my results soon enough.

stevej37 04-28-2020 01:10 PM

[QUOTE=Solamar;10842478]
This is the "$5 part" that your mechanic was probably referring to. It attaches the clutch cable to the clutch pedal cross shaft -



I think #30 is what went bad on mine. It's been a while, but I remember the mechanic saying "I find these gone bad often. It's only a $5 part" Maybe that is the same as what your pic is showing at the top?


http://forums.pelicanparts.com/uploa...1588108027.jpg

Solamar 04-28-2020 02:23 PM

[QUOTE=stevej37;10843895]
Quote:

Originally Posted by Solamar (Post 10842478)
This is the "$5 part" that your mechanic was probably referring to. It attaches the clutch cable to the clutch pedal cross shaft -



I think #30 is what went bad on mine. It's been a while, but I remember the mechanic saying "I find these gone bad often. It's only a $5 part" Maybe that is the same as what your pic is showing at the top?


http://forums.pelicanparts.com/uploa...1588108027.jpg

Part 7 is what failed on mine (pictured above) but I've heard that pin #30 can break and cause problems as well

rubenmad 04-28-2020 05:52 PM

I just finished rebuilding my pedal cluster and have started installing a new clutch cable. My cable seems to have much more tension where it connects to the omega spring.

Are you able to tighten the 15 mm nut closest to the front of the car in order to increase tension or have you bottomed out the nut. If so, you may need to get a new clutch cable. They tend to stretch over time.

Locker537 04-29-2020 07:18 AM

Little detour - the little L-bracket was bent enough that I now need to replace it.

Locker537 04-30-2020 12:45 PM

"Overnight parts from Japan..."

...well, not Japan, but rather surprisingly the parts I ordered showed up quick!

http://forums.pelicanparts.com/uploa...1588279401.jpg

The casting on the new part doesn't look anywhere near as nice as the original, but dimensionally it's spot on. Maybe the additional aluminum used in the casting is for strength, but something tells me it's just cheaper manufacturing.

Not pictured is another circlip for the little finger "just in case" and the little rubber stop that goes on the pedal board for the clutch pedal. Mine is rather tired.

Back at it today or tomorrow...

Locker537 05-03-2020 06:37 AM

Time to conclude this project.

The clutch is properly and nicely adjusted as of a couple days (and probably 150 miles) ago.

So why was the pedal not returning fully?

My answer:
  1. Not enough tension in the cable
  2. No grease on the omega spring pivot

I ended up replacing the clutch stop bracket after Ivan pointed out it was bent, which I admittedly made worse trying to straighten it out. $160 lesson there, but that's how you learn.

I replaced the cable boot and the little rubber stop on the pedal board as well.

After this thread, and speaking with a knowledgeable local mechanic, it's clear that 1MM (.047 inches) gap is "too much". The procedure I ended up using was:
  1. Remove the cable, adjust the gap between the arms to 1.2mm using the stop bolt
  2. Re-attach cable and tighten just until the big arm comes off the stop bracket
  3. Tighten the cable until the little arm hits the stop bolt, then back it off until you have enough clearance to clickity clack the arm with your finger. It's probably half of the "factory spec".
  4. Have your wife work the clutch while you check the overall throw (what an inaccurrate procedure for me...).
  5. Dab a little grease on any metal contact points that pivot.

So in the end, no parts were really worn. The stop bracket was probably "fine" had I not touched it, and the little "bind" in the pedal was due to insufficient cable tension and no lube. That little "cam" in the omega spring is suppose to be there.

Thank you Ivan, Solamar, and everyone else who shared thoughts.

proporsche 05-03-2020 09:40 AM

good job...;-) and you are welcome.....
Ivan

pmax 05-03-2020 10:48 AM

Congrats.

Quote:

Originally Posted by Locker537 (Post 10849835)
After this thread, and speaking with a knowledgeable local mechanic, it's clear that 1MM (.047 inches) gap is "too much".

I'm always impressed by the precision factory instructions for this procedure. The in spec gap is 1mm with 0.1mm margin according to Porsche.

Solamar 05-03-2020 05:25 PM

Nice! Glad you got it figured out


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