Clutch: Testing and Inspection

PRIMARY CHECKS
CLUTCH SYSTEM DIAGNOSIS
Identify the problem and the probable cause before attempting to repair the clutch or related components. Most clutch and manual transmission problems are revealed as high shift effort, gear clash, or grinding. Make a careful analysis when any of these problems occur.
Before removing the hydraulic clutch system, check the reservoir fluid level. The actuator cylinder must be in place when checking the fluid level. If low, fill the reservoir to the specified level with Delco Supreme No. II Hydraulic Brake Fluid (GM P/N 1052535) or an equivalent DOT 3 motor vehicle brake fluid.

Notice: Carefully clean the top and sides of the reservoir before opening to prevent contamination of the system with dirt, water, or other foreign material. Remove the reservoir diaphragm before adding fluid. Carefully replace the diaphragm and cover after filling.

If the reservoir requires any fluid, check the hydraulic system components for leakage. A slight wetting of the surfaces is acceptable. Replace the system if excessive leakage is evident.

CLUTCH SPIN DOWN TIME
Check the clutch spin down time as follows:
1. Apply the parking brake. Block the vehicle wheels.
2. Shift the transmission into neutral.
3. Start the engine. Run the engine at idle speed.
4. Engage the clutch.
5. Disengage the clutch. Wait 9 seconds.
6. Shift the transmission into reverse.
7. If you hear a grinding noise, refer to Clutch Will Not Disengage.