GuardsRedHammerhead

Now, before you point fingers and tell me to use the search function, I have used it. I find all kinds of stuff on Double-D clutches and the like. No real procedure for the 928 S4. I even called and asked Roger, and he had no write up and couldn't find one using search.

Is there one?

My clutch just started slipping in 3rd and 4th, last week. Conveniently timed around SITM 2012, and while I am trying to sell it. Another repair that I will not recoup in the selling price.

Anyhow, any S4 clutch procedures, docs, pictures, advice would be great.

Rob Edwards

Couple o' threads on R&R'ing the clutch in my 90 GT with new:


Initial steps: (post #3)

https://rennlist.com/forums/928-foru...val-90-gt.html

Release bearing R&R and clutch reinstall (posts 6 and 16):

https://rennlist.com/forums/928-foru...g-problem.html


I will attach the writeup Bilal is referring to in the first thread when I get to my other computer.

Courtshark

Are you sure you need to R&R the clutch? Mine did something similar recently. Turned out it just needed to be bled. I'd try that before diving into all of this. And you can probably still make SITM if I'm right!

Rob Edwards

Here's that amalgam of clutch R&R info as a pdf:

https://webfiles.uci.edu/redwards/pu...%202-12-12.pdf

GuardsRedHammerhead

I did not attempt a bleed. Might be good to try. I do not abuse my car, and I know how to drive a manual, properly. It came on REAL sudden and only does it in maybe 3rd or 4th when cruising at about 45 or 55, and you attempt to accelerate. Never a burning smell when it does it. Just an over-rev, without appropriate acceleration.

I will have to find the bleed procedure and try it tonight.

Courtshark

That sounds EXACTLY like what mind did. Bleed, & then hit the road for SITM! Note that when I opened the bleeder valve, nothing came out initially. Very odd. When I posted my woes, another poster, can't recall who, suggested removing a large washer near the master cylinder. Bleeding was much easier.

The write ups I found recommended a power bleeder. I did not find that to be necessary; having a second person handy to help was all; and a special adapter to attach the manual bleeder to the fluid container, as it is tucked mighty tight into the fender. Good luck!

GuardsRedHammerhead

Do you have links to the write-ups? I am searching, as we speak.

GuardsRedHammerhead

Thank you, Rob. Thank you very much.

I will try the bleed, first, seeing as my symptoms came on nearly instantly.

Courtshark

https://rennlist.com/forums/928-foru...-cylinder.html

Do you have the WSM?

GuardsRedHammerhead

Thank you for the link. I do not have the WSM.

Courtshark

OK. It's a really basic procedure once you have everything hooked up. Just be sure to have Super Blue or whatever you use handy to top off the reservoir.

GuardsRedHammerhead

You have me praying that is what it is.

GregBBRD

It's a single disc clutch....there are no tricks.....except it's heavy and will hurt you if you let it fall on yourself.

Bleeding the clutch won't help a slipping clutch....that would only help if the clutch didn't release. The only thing that could possibly happen (to the hydraulic system) for a clutch to slip would be for the "free-play" to the clutch master suddenly changing (like the adjustable rod lock nut comes loose and the rod somehow gets longer....virtually impossible, by the laws of physics.)

Remove it. Figure out what broke (for a clutch to go from good to bad, instantly, is almost always a broken diaghragm.....wear won't do this....unless you "missed" it slipping for quite some time.

Replace the broken/worn pieces, stick it back in the car, and off you go.

Courtshark

Greg, I had identical symptoms and bleeding the clutch solved the problem. Seriously! Not making it up!

And it's much easier to try this first at least, eh?

yak 944s

Hey.. not to put a damper on this.. I had exact same symptoms in my 87 S4. Bleeding did nothing. Clutch disk was shot. Finished the repair last week .. plus replaced pilot, RMS, ball cup, shift linkage bits, RMS, changed transaxle oil too. Shifts smooooth now. I hope for you bleeding does the trick.