Owners manual

Test Drive – Break in
When you test drive the vehicle, pay attention to the release point on the pedal and how smoothly the transmission shifts. You may need to re-adjust the linkage to attain the proper release point. If
you are using a freshly surfaced or new flywheel, and have selected the proper clutch components for your application, proper break in requires 500-1,000 miles of non-aggressive driving.
Troubleshooting Problems
The Clutch Will Not Release
- Check release bearing adjustment on mechanical or cable release systems. Add release to the system, checking carefully to make sure the bearing still has a minimum ¼ inch clearance to the fin-
gers of the pressure plate.
- Observe the fork angle with the linkage disconnected, and the fork pulled up so the bearing just touches the clutch fingers. At this point, the clutch fork should be angled to the front of the car (dri-
ver side pivot) or the rear of the car (passenger side pivot). Improper fork angle can cause non-release or excessive pedal effort. Correct this problem by adjusting the pivot ball height or, in some
cases, using a longer release bearing ( see dia. “B”)
- Check to make sure the release bearing is properly installed in the clutch fork ( see photo “A”).
- On hydraulic systems, re-bleed to insure you are getting full travel from the release bearing.
- Re-check torque on the pressure plate bolts.
If This Does Not Fix The Problem- you must verify that the clutch is releasing properly.
- Remove the clutch system and flywheel
- Check the clutch disc for excessive runout by installing it on the transmission and rotating. If the disc wobbles excessively, it may have become bent during the install and can cause non-release.
- Bolt the pressure plate and disc to the flywheel, put the assembly into a press and using the release bearing, press the fingers in to a total travel of .400” to .500”.
View the clutch assembly from the side and verify that the disc is able to move back and forth, and you are seeing light between the disc and pressure plate/flywheel.
- f doing this test attains release, the non-release is related to some other component in the release mechanism and these components should now be tested/repaired as needed.
- Some GM LS applications MAY require slave cylinder shim PN 598 for proper release.
Vibration
- Verify that if the clutch originally used dowel pins to locate the pressure plate, they are in place, as the clutch centers itself on these pins. Except 88931, 88931HDX, 92931, 98931 and 98931HD-
sets.
- If you have changed your flywheel, verify that you have installed a flywheel with the proper balance for your engine.
- Check for bent or distorted flanges on the pressure plate. This will pull the pressure plate down unevenly and could cause a vibration or chatter.
Clutch Slips
- Verify release bearing clearance. A minimum of ¼ inch clearance should be maintained on mechanical or cable linkage systems.
- For hydraulic bearing applications, verify by measuring following the instruction sheet included with the clutch to be sure the bearing is being loaded the proper distance when the transmission is in-
stalled.
- Was the flywheel resurfaced? Unfinished flywheels will not allow a new disc to mate properly and can cause premature wear or failure.
- Make sure you have selected a clutch system that is capable of holding the vehicle horsepower level and gearing.
Clutch chatter
- Different friction materials react differently as heat in the clutch increases. Organic clutches offer the smoothest engagement, while metallic based materials get more aggressive as the clutch heats