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Clutch won't fully disengage

Jesh

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Joined
Nov 12, 2009
Messages
282
Location
Soldotna, Alaska
So I just installed a kevlar/ceramic South Bend clutch in my car, with the included 2700PP. I'm using a SPEC aluminum flywheel which I just replaced the bolt on friction surface. The problem is the clutch won't completely let go of the flywheel/pressure plate. I have bled the clutch system more that I care to admit, and even replaced the slave cylinder. I looked through the rubber boot the clutch fork goes through and the pressure plate is being compressed as soon as you start to push the clutch pedal. But if you start the car in gear with the clutch depressed you can bump the car and away you go. Ideas?
 

losermakesgood

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Joined
Mar 30, 2012
Messages
91
Location
Mishawaka, IN
When I installed my South Bend clutch I had the same problem. Adjust the clutch pedal. Check your adjustments. I ended up having to back the master adjustment out pretty far and even added an extended push rod.
 

turbowop

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Joined
Apr 29, 2001
Messages
11,971
Location
Yakima, WA
You shouldn't have to add an extended rod or bottom out the MC adjuster. What slave are you guys using? Hopefully the one with the smaller bore. And did you guys bleed all the air out of the slave by compressing it during the bleeding process?
 

losermakesgood

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Mar 30, 2012
Messages
91
Location
Mishawaka, IN
I used all oem stuff except for the south bend clutch parts. They are just a few miles from me making things easier. Yes everything bled correctly. No problems over the past year with it. Just initially
 

snailspool

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Dec 13, 2012
Messages
123
Location
Albuquerque, NM
Is the fork end where the slave pushes it, more towards the driver side of the rubber boot? Or the passenger side of the window? It should be slightly further to the driver side, and if not, you may need to shim, or replace, your fulcrum pivot.
 

gaylantvr4

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Oct 3, 2004
Messages
850
Location
Omaha ,NE
I agree with tektic. At the age of these cars and heavy pressure plate clutches the pedal assy should be rebuilt with a clutch install. It makes a night and day difference in where the clutch engages. The extended slave rod is more a a bandaid fix for a worn out pedal assy
 
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SSGdave

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Joined
May 31, 2011
Messages
137
Location
San Diego, CA
Quoting tektic:
No one mentioned worn clutch pedal assembly?



very very common. I would defiantly check that after adjusting the clutch peddle. then check the master/slave, fork yadda yadda...
 

prove_it

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Jul 3, 2008
Messages
4,201
Location
Sioux Falls, SD
and clutch fork, pivot ball, new hydraulics....
 

Jesh

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Nov 12, 2009
Messages
282
Location
Soldotna, Alaska
Update: Okay so I've installed a new slave cylinder, master cylinder and I'm confident I have all the air out of the system. Clutch fork isn't bottoming out on anything and clutch pedal assembly is in good shape. Is there anything else I should look for?
 

SSGdave

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May 31, 2011
Messages
137
Location
San Diego, CA
/ubbthreads/images/graemlins/confused.gif hmmmmmm...

if you already tried adjusting the pedal again, then honestly, you may have a clutch assy issue.
Like a dammaged spring on the clutch disk.

the only other thing I can think of is possibly a damaged clutch fork or worn out piviot ball.
check your fork alignment also while your in there.
 

Jesh

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Joined
Nov 12, 2009
Messages
282
Location
Soldotna, Alaska
So after determining that I was getting all the throw possible from the clutch system, I finally gave into the inevitable and pulled the transmission again, (only took 2hrs this time, I'm getting faster /ubbthreads/images/graemlins/grin.gif) upon close inspection of the clutch fork, throwout bearing and transmission splines everything is in good condition and where it should be. The only thing I could find that may have caused the drag is the fact that the old pressure plate is about 1/16th of an inch shorter than the new pressure plate /ubbthreads/images/graemlins/dunno.gif.
 

tektic

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Dec 19, 2012
Messages
1,497
Location
ronkonkoma, ny
Was the pivot ball shimmed? Most people will say a shim is a good idea with an after market clutch setup.

I'm going through similar issues now. I keep loosing the adjustment for the clutch. My pedal assembly was definitely a problem. Then it turned out to have been welded in the wrong position. I have since cut and rewelded it. It no longer has any play. It worked fine for a day or two then no disengagement. Blead adjusted, Worked for a day or two. Today drove it all day, tried to start it at 5pm no disengagement.

I ordered new excedy master and slave today. I will see if that helps. I think I have the wrong slave cylinder on the car. It' might be one from a fwd. Not sure what difference it makes besides being a real pain to bleed. I have a worsening drive train noise issues too. The work on this car never seems to end.
 
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SSGdave

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May 31, 2011
Messages
137
Location
San Diego, CA
okay, if there is no damage to the actual shift cables... AND everything is 100% in order, the diag would lead me to a possible trans issue. Syncro, Hub Slider, Shift Forks and Rails, that type of thing.

any metal in the trans fluid?
 

Jesh

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Joined
Nov 12, 2009
Messages
282
Location
Soldotna, Alaska
Nope every worked perfectly until I installed this clutch.
 

SSGdave

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Joined
May 31, 2011
Messages
137
Location
San Diego, CA
what Flywheel are you using? *edit* okay I see it a Spec flywheel. you said you replaced the friction surface, but did you check or have it checked for straighness and flatness. Also does your clutch kit require a "stepping" of the flywheel for correct engagement???

and really checkout that clutch cover. Ive seen some fail to which only 50% of it would disengage
 
Last edited:

strokin4dr

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Joined
Aug 30, 2005
Messages
2,770
Location
Savannah, GA
+1
My first time reading this I was thinking that the clutch step was probably way too short after installing the new flywheel friction surface. Step needs to be checked and set EVERYTIME something is replaced with the clutch setup or you are just asking for problems. I hope you didn't put the trans back in yet!
Good luck.
 

Jesh

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Joined
Nov 12, 2009
Messages
282
Location
Soldotna, Alaska
Update: Well the car is still jsb while I workout the clutch issue,



But this did give me an opportunity to finally scrub most of the road grime off the transmission /ubbthreads/images/graemlins/smile.gif



At this point I'm leaning towards ordering a different clutch since I've been unsuccessful at getting the Southbend to work, but I have a few calls to make on monday that will probably answer my questions, I'll try to let you guys know what happens.
 
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