Replacing clutch cable

[emac]

I read up on how to change the cable and want to replace it myself next week. It seems like it is a straight forward job. Only issue is at 60 yrs of age do you think I can handle it myself or should I take it to the shop.

[bkreigsr]

go for it Ernie. - piece of cake, just be prepared to do some dash-diving (my least favorite repair related position) to get the ends connected/adjusted.
Bill K (63 1/2)

[lindy 911]

emac,

The only issue I had was routing the new cable through the tunnel. There are a couple of spots where it can get hung up. It's easiest if you remove the drivers seat and can get to the front and rear tunnel access plates and the the shifter base. Remove these and you can make sure the cable goes through the way it's supposed to. Do you have a good manual; that will help loads.

Lindy

[sc_rufctr]

Tie a piece of cord to the end of the existing shifter before you pull it from the car.
Pull out cable... Then transfer the cord to the new cable and pull back through.

Easy peasy...

Do you have a grand son who can help?

[teamfee3]

if you do it will you take and post photos of it in progress?

[Peter Zimmermann]

Ernie; Here's your removal instructions...

A recent thread... - Rennlist Discussion Forums

I'll post the install sheet in the next post!

[bkreigsr]

Originally Posted by sc_rufctr

Do you have a grand son who can help?

very funny
ha ha

[Peter Zimmermann]

Ernie; Here's the install instruction...

Clutch cable installation – 1977-1986

OK, first I must make a few assumptions; (1) the pedal assembly area has been cleaned, (2) the clutch pedal helper spring on the left side of the pedal tray is in good condition, (3) the clevis pin bushing has been replaced, (4) the rear of the car is in a raised position, and properly/safely supported, and (5) if your old cable, at its Bowden tube, passed through a hangar/anchor attached to the side of the transmission, roughly above the throttle lever, remove that anchor and re-install the nut with a wavy lock washer. The hangar will not be re-used.

First, put a thin coating of grease (I like amber disc brake wheel bearing grease) on the new clutch cable. Installation into the car is tricky, because you don’t want that greased cable to touch anything, and drag dirt along with it. While lying under the car guide the clevis end of the cable over the throttle lever on the side of the transmission (clean towels, rags, even newspaper, placed to help keep the cable clean can be invaluable), and into the cable attachment tube welded onto the firewall. Push the cable forward until the Bowden tube reaches the firewall tube, and push the cable home over the firewall tube.

Move to the inside of the car, locate the front end of the cable in the tunnel, and pull it out from the tunnel. Wipe the threads off because usually a little bit of dirt will be sticking to them. Screw the jamb nut on to the cable. On cars with a known good clutch, leave six threads on the clutch cable showing between the rear side of the jamb nut and the rear end of the threaded section of cable (in other words, screw the nut on until it almost bottoms out, then back it off until you can count six threads). Screw on the clevis fork until it reaches the nut, but don’t tighten it; the chance that the other end of the cable is at the correct position to install over the hook will be slim. Push the cable into the tunnel until the clevis fork lines up with the clutch pedal shaft, and push the clevis pin home with a light coat of high quality grease. Your final step before getting out of the car is to pull the clutch pedal up from the floor and support it in that position (I use a 13mm open/box wrench for this, probably because it works so well I’ve never bothered to make a tool).

OK, back under the car. Take your pry bar (large flat-bladed screwdriver), your 2x 15mm open end wrenches, 2x 13mm open end wrenches, and your circlip pliers with you. Hook the cable onto the hook on the long cable arm and use the pry bar to push that arm toward the rear of the car – use your head, the spring is very strong, and you don’t want fingers in the way. Loosen the adjustment bolt jamb nut, also on the long arm, and back off the bolt a little. Grease the splines on the TOB fork shaft, slide the short arm on, and install the circlip.

Take the end of the Bowden tube, spread the 15mm nuts apart enough to fit over the aluminum anchor, and, with a lock washer on each side, slip the cable into place on the anchor. To save a problem later, slide up under the firewall and make sure that the forward end of the Bowden tube is properly seated.

Now, go back inside the car and take a 12mm and 10mm open end wrench with you. Remove your clutch pedal brace, and push the pedal down to the floor and hold it there while snugging the jamb nut to the clevis fork (I use my left elbow against the clutch pedal, use my left hand to hold the 12mm wrench in place on the clevis, and snug the nut using the 10mm wrench in my right hand). It’s a little awkward, but you can figure out the best way that will work for you. Release the clutch pedal from the floor; it should come up close to the top of its regular travel.

Now for the fun part, cable adjustment. You should be back under the car, hopefully you still have your 15mm and 13mm wrenches with you, and you also need two feeler gauges; a 1.0mm and an 0.2mm. You can also use, of course, a 1.2mm gauge along with your 1.0 gauge; I found it easier to have the first two gauges, and use them together for the initial setting, then use only the thick one for final adjustment.

With the clutch cable slack, adjust the distance between the end of the adjustment bolt and the tip of the short arm to 1.2mm. The gauge should come out with a bit of resistance. Hold the head of the bolt and snug down the jamb nut. Next, use the two 15mm (wrench size) nuts to gradually tighten the clutch cable, keeping in your vision where the arc of the Bowden tube is, and concentrating on the gap that you’ve set to 1.2mm. The Bowden tube should rest about an inch from the side of the transmission, and you can actually see your gap at the adjustment bolt begin to close. When it does, wiggle the cable near its hook, it should be pretty tight. Insert your 1.0mm gauge in between the adjustment bolt and the tip of the short arm, and use the 15mm nuts to continue to tighten the cable until your gap is 1.0mm. Watch the Bowden tube as you final snug the two 15mm nuts, depending on how you turn them the tube will want to move out of its desired position.

Re-enter the car, and depress and release (by hand or foot) the clutch pedal a few times. Go back under the car and recheck your cable tightness, and your measured gap. Adjust as necessary keeping in mind that all changes must be done by keeping the Bowden tube in position, the cable tight, and the final gap at 1.0mm.

Go inside the car, reinstall the floorboard and carpets (make sure that the gas pedal rod is seated properly in the gas pedal), pat yourself on the back and go for a drive.

[jmohn]

[QUOTE=sc_rufctr;5277418]Tie a piece of cord to the end of the existing shifter before you pull it from the car.
Pull out cable... Then transfer the cord to the new cable and pull back through.

I agree, very helpful.

The only other caveats are be sure you thread the attaching "clevis"onto the pedal end of the cable "far enough" (IIRC about 1/4" of the thread should be exposed in the clevis). You don't want to make the connection at the pedal cluster twice; and be sure you put sufficient "bow" in the rigid portion of the cable (between the mount on the transmission/bell-housing and the tunnel fire-wall) or you'll have clutch "shudder".

I did mine when I was 60 (2 years ago), I'm replacing rear wheel bearings now.

Good luck,

Jerry M
'78 SC

[Gunter]

emac:

Age doesn't matter if you're agile. Do you have the Bentley?
Take your time and lift the rear securely.
The tricky part is the connection of the cable in the pedal cluster up front, tight space and you'll need Fingerspitzengefühl. (Finger tip dexterity) to install the clevis and clevis clip. Extend the new cable a good 1/4" into the clevis and lock the nut and the clip.

I suggest you first inspect the pedal cluster before starting because you may need a few more parts. SC Bentley 301-7 to 9.
Parts that can wear:
#14 Pedal Cross-shaft cable-connect lever,
#16 Bushing,
#5 Clevis,
#2 Roll pin

930-423-027-01-M260 Pedal Shaft, 911 (1977-86)
Brand: OEM [Photo] $39.00

999-166-001-02-M260 Snap Retainer Clip / Pin For Clevis Fork (clutch cable to pedal shaft), 911/912E (1974-86), 911 Turbo (1976-88)
Brand: OEM [More Info] $3.25

900-309-002-00-M105 Clutch Pedal Roll Pin, 6x28mm, 911/911 Turbo (1974-86) Brand: Canyon [Photo] $1.00

You may also find that the bushings in the pedal cluster are worn and need to be replaced.
Go for the brass bushing kit from Pelican:

10-1792-423-M105 Bronze Pedal Bushings Kit, 911 (1974-86), 911 Turbo (1976-88)
Brand: Canyon [More Info] $14.25

Refurbishing the pedal cluster including painting the housing #20 gives long-time peace of mind.

Before installing/adjusting the new cable, make sure the long actuating lever for the clutch on the cross-shaft moves freely! If not, remove the circlip, remove the short and long lever, clean and oil the cross-shaft, re-install the levers and circlip and adjust the clutch.

Do you have the Bentley Repair Manual?

[Targa Me]

emac, if your agile enough you can do it.
it helps if you have a couple of ramps you can use to drive the back end of the car up. the part that was the worst for me was crawling underneath the dash to attach the clevis.

[Hladun]

I'm 60 and last fall I dropped my engine/transmission and changed the clutch. But it does depend on how fit you are.

[74-911]

Originally Posted by Hladun

I'm 60 and last fall I dropped my engine/transmission and changed the clutch. But it does depend on how fit you are.

+1

I'm 64. Rebuilt the rear suspension last year and just R & R'd the shift rod seal last week.

BTW, I've got a new clutch cable sitting on my work bench. Keep us posted on how it turns out.

[emac]

All

Thanks for all the replies -- I really don't think that I will have any issues other then "dash diving". I have done just about all the work on my car myself but sometimes it seems that what appears to be the easiest job turns out to become a nightmare.

Pete
Great post I will follow it to the letter. Again thanks for all the help and tips.,

[Peter Zimmermann]

Originally Posted by emac

All

Pete
Great post I will follow it to the letter. Again thanks for all the help and tips.,

You're more than welcome. Just remember, do not use an aftermarket cable, if it says "Made in West(ern) Germany" in white letters on the bowden tube, send it back!

[tcar]

Second on the aftermarket

There are also a few still floating around that were made in France that have problems.

[boyt911sc]

Originally Posted by emac

I read up on how to change the cable and want to replace it myself next week. It seems like it is a straight forward job. Only issue is at 60 yrs of age do you think I can handle it myself or should I take it to the shop.

emac,

I'm close to 10 years older than you and I did one last month. Tie a string to the clutch cable as suggested by others and pull it out rearward. A second hand will be good to pull/pull the cable out from the tunnel. My only problem was wearing a bi-focal eyepiece and have to switch back and forth to my computer eyeglass to see well inside the tunnel.

Please pay attention to Peter Z's advise about the omega spring and clutch lever. To unload the omega spring, push it forward with a pry bar or a large screw driver. And also the amount of thread used by the clevis (by the clutch pedal) is critical. Keep us posted.

Tony