Clutch Pedal Assembly: Adjustments

1984---88 CORVETTE
The clutch release mechanism on these models is hydraulically operated, and is not adjustable. When the clutch pedal is depressed, the pedal pushrod contacts a plunger in the clutch master cylinder bore. The plunger first closes off the master cylinder fluid return port, then when moved further, forces fluid under pressure into the clutch slave cylinder. As pressure is applied to the slave cylinder, the slave cylinder piston is forced outward activating the clutch release fork. To diagnose malfunctions in the clutch release system, proceed as follows:

Inspection

1. With engine running at normal operating temperature and brakes applied, hold clutch pedal approximately 1/2 inch from fully depressed position and move transmission selector between 1st and reverse several times.
2. If transmission selector can be moved without binding or gear clash, clutch is releasing properly.
3. If shifter cannot be moved or if gear clash is evident, inspect linkage, fork and ball stud for damage and wear, and replace as needed.
4. If linkage is satisfactory, check clutch pedal and slave cylinder travel.
5. Clutch pedal travel should be 7 3/8 inch, and slave cylinder plunger travel should be .70 inch, measured at the clutch fork.
6. If pedal travel is not within specifications, repair as needed. If plunger travel is not as specified, bleed or repair hydraulic system.

Bleeding

1. Fill master cylinder reservoir with specified fluid.
2. Raise and support vehicle.
3. Remove slave cylinder attaching bolts and secure cylinder at 45° angle with bleeder screw at highest point.
4. Fully depress and hold clutch pedal, then open bleeder.
5. Close bleeder then release clutch pedal.
6. Repeat steps 4 and 5 until all air has been purged from system, remount slave cylinder and repeat inspection. Check and fill master cylinder reservoir, as needed, to ensure that no air is drawn into system during bleeding.