Compressor Clutch: Testing and Inspection

- Check the plated parts of the pressure plate for color changes, peeling or other damage. If there is damage, replace the clutch set.




- Check the rotor pulley bearing play and drag by rotating the rotor pulley by hand. Replace the clutch set with a new one if it is noisy or has excessive play/drag.




- Measure the clearance between the rotor pulley and the armature plate all the way around. If the clearance is not within specified limits, the armature plate must be removed and shims added or removed as required, following the clutch overhaul.

Clearance: 0.5 ± 0.15 mm (0.020 ± 0.006 in)

NOTE: The shims are available in three thicknesses: 0.1 mm, 0.2 mm, 0.4 mmand 0.5 mm.






- Release the field coil connector from the holder, then disconnect it. Check the thermal protector for continuity. If there is no continuity, replace the thermal protector.





- Check resistance of the field coil.

Field Coil Resistance: 3.4 ± 0.15 Ohms at 68° F (20° C)

If resistance is not within specifications, replace the field coil.