Rotating Torque Check

Rotating Torque Check

The rotational torque of a used A/C compressor should be checked as follows if excessive compressor drag is suspected.

1. Discharge refrigerant system. Observe all safety precautions.

2. Remove A/C manifold and tube from A/C compressor. Use care not to allow dirt to enter A/C compressor.

3. Remove the A/C compressor from the vehicle. With the A/C clutch disengaged, rotate the compressor shaft one complete revolution and note the torque required to rotate the shaft another complete revolution.

4. If the rotational torque exceeds 13.015 N.m (9.6 lb-ft), replace the A/C compressor assembly.

5. If the rotational torque is less than specified, excessive drag does not exist in the A/C compressor. Install the A/C manifold and tube and leak test, evacuate and charge the system.

6. Check the system for proper operation.