Clutch Help Needed
Thread Starter
Instructor
Joined: Mar 2008
Posts: 144
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From: Castle Rock Colorado
Clutch Help Needed
I just installed a Centerforce dual friction and a new slave. I can not get a good pedal. The pedal feels good but fully depressed it never fully releases the pressure on the pressure plate. Sometimes I can only get it in gear if the engine is off. I tried a Mighty Vac from the top and my remote bleeder from the bottom. Let me hear all the things you guys have done to solve this problem. Thanks.
Melting Slicks
Joined: Apr 2007
Posts: 2,945
Likes: 1,116
From: Hereford AZ
I recently installed a new master, drilled the slave during a trans and rear diff swap. And before that I replaced the clutch (used and RPS dual friction)...this is just to let you know I have experienced a clutch swap in one of these cars. No, I would say that if you are bleeding the slave properly you should be able to get the clutch to work normally. An adjustable master should not be required (I replaced with a stock one only for piece of mind). I think you should ensure your fluid is a good clean synthetic. If that is good you may want to go over your clutch install to ensure you didn't miss something. Call the Clutch manufacturer and see what they suggest.
Melting Slicks
Joined: Apr 2003
Posts: 2,285
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From: Nashville TN
It sounds like you might need to shim the slave. Make sure the slave is not leaking, this will prevent full stroke. An adjustable master should not be needed nor will it help with this problem.
Thread Starter
Instructor
Joined: Mar 2008
Posts: 144
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From: Castle Rock Colorado
Do I have to pull the torque tube all the way out to shim the slave? Where do you get shims and how do you know how much to shim? Will the adjustable master not work because the slave is still not pushing against the pressure plate any more?
Tech Contributor
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From: Dyer, IN
Thread Starter
Instructor
Joined: Mar 2008
Posts: 144
Likes: 0
From: Castle Rock Colorado
Forget about the curve ball suggestion of the adjustable master for now....work the problem.
I bled with the mighty vac from the clutch reservoir on top and the remote bleeder on the bottom.
The pedal feels good like it is fully bled. It feels like the slave is not pushing fully on the pressure plate. The clutch releases the instant I release the pedal. I also have to turn the car off to get the car into reverse because the pressure plate is always putting pressure on the clutch disc.
Thanks for the help.
Burning Brakes
Joined: Nov 2005
Posts: 1,228
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From: Houston MN
St. Jude Donor '10
I install the shim, that didnt work. Took the shim out, that didnt work. Install the adjustable master, that worked. Like I said, if the clutch feels good, good pressure and good pedal return. Then I dont see how thats the problem. The shim just put the slave to close, the adjustable master worked great. Many, many know a lot more then me, but I dont think the adjustable slave is a "curve ball"
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Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
Do you have a remote bleeder installed on the slave...which is: a physical line that connects to the slave and is routed up to the master cylinder area?
I don't understand what you mean by bled "from the clutch reservoir on top and the remote bleeder on the bottom".....where did you hook up the mighty vac?
Last edited by lucky131969; Aug 22, 2008 at 03:40 PM.
Tech Contributor
Joined: Jan 2007
Posts: 19,528
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From: Dyer, IN
I install the shim, that didnt work. Took the shim out, that didnt work. Install the adjustable master, that worked. Like I said, if the clutch feels good, good pressure and good pedal return. Then I dont see how thats the problem. The shim just put the slave to close, the adjustable master worked great. Many, many know a lot more then me, but I dont think the adjustable slave is a "curve ball"
Thread Starter
Instructor
Joined: Mar 2008
Posts: 144
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From: Castle Rock Colorado
I have a LAPD remote bleeder. I hooked the mighty cav to that. I believe it is bled well. The pedla just releases the clutch at the wrong time, way to early. It sounds like an adjustable master may be the solution to my problems.
Tech Contributor
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From: Dyer, IN
Drifting
Joined: Jan 2008
Posts: 1,722
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From: Florida
St. Jude Donor '09
Either you do not have sufficient hydraulic pressure to fully stroke the slave cylinder actuator (leak) to the end of its travel, or the slave cylinder actuator stroke distance is not sufficient to fully "disengage" the pressure plate from the driven plate.
I'm not familiar with the centerforce pressure plate, but the factory "Luk" pressure plate has an adjustable diaphragm spring pivot point which sets the correct distance at installation; this procedure is outlined on page 7-349 of the factory shop manual.
In the absence of an adjustable pressure plate diaphragm spring, your only choice will be to either shim the slave cylinder to set the correct stroke, or use an adjustable master cylinder to achieve the same goal.
I'm not familiar with the centerforce pressure plate, but the factory "Luk" pressure plate has an adjustable diaphragm spring pivot point which sets the correct distance at installation; this procedure is outlined on page 7-349 of the factory shop manual.
In the absence of an adjustable pressure plate diaphragm spring, your only choice will be to either shim the slave cylinder to set the correct stroke, or use an adjustable master cylinder to achieve the same goal.