Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCOMPRESSOR HVACCOMPRESSOR CLUTCH HUBSERVICE AND REPAIR
1990 Chevrolet Lumina APV V6-191 3.1L
Compressor Clutch Hub: Service and Repair
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Service and Repair
Remove or Disconnect
1. Clamp the holding fixture J-34992 in a vise and attach compressor to holding fixture with thumb screws J-34992-1.
2. Keep the clutch hub and drive plate assembly from turning by using the clutch hub holding tool J-33027. Remove the shaft nut using shaft nut socket J-33022.
3. Thread the Clutch Plate and Hub Assembly Remover J-33013 into the hub. Hold the body of the remover with a wrench and turn the center screw into the remover body to remove the clutch plate and hub assembly.
4. Remove the shaft key and retain for reassembly.
Install or Connect
1. Install the shaft key into the hub key groove. Allow the key to project approximately 3.2mm (1/8") out of the keyway. The shaft key is curved slightly to provide an interference fit in the hub key groove.
2. Be sure the frictional surface of the clutch plate and the clutch rotor are clean before installing the clutch plate and hub assembly.
3. Align the shaft key with the shaft keyway and place the clutch plate and the hub assembly onto the compressor shaft.
NOTICE: Do not drive or pound on the clutch hub or shaft. Internal damage to compressor may result.
4. Remove the J-33013 remover - installer center screw and reverse the body direction on the center screw as shown in illustration.
5. Install the clutch plate and hub installer J-33013 with bearing as shown in illustration.
The body of the J-33013 installer should be backed off sufficiently to allow the center screw to be threaded onto the end of the compressor shaft.
6. Hold the center screw with a wrench. Tighten the hex portion of the Installer J-33013 body to press the hub onto the shaft. Tighten the body several turns, remove the installer and check to see that the shaft key is still in place in the keyway before installing the clutch plate and hub assembly to its final position. The air gap between frictional surfaces of the clutch plate and clutch rotor should be 0.38-0.64mm (0.015-0.025").
^ If the center screw is threaded fully onto the end of the compressor shaft, or if the body of the installer is held and the center screw is rotated, the key will wedge and break the clutch hub.
7. Remove installer J-3301 3, check for proper positioning of the shaft key (even or slightly above the clutch hub). Install the shaft nut. Hold the clutch plate and hub assembly with clutch hub holding tool J-33027 and using shaft nut socket J-33022, tighten the nut against the crankshaft shoulder to 11-22 N.m (8-16 ft. lbs.) torque, using a 0-35 N.m (0-25 ft. lbs.) torque wrench.
8. Spin the pulley rotor by hand to see that the rotor is not rubbing the clutch drive plate.
Removing Shaft Nut:
1. Clamp the holding fixture J-34992 in a vise and attach compressor to holding fixture with thumb screws J-34992-1.
2. Keep the clutch hub and drive plate assembly from turning by using the clutch hub holding tool J-33027. Remove the shaft nut using shaft nut socket J-33022.
Clutch Plate And Hub Assembly Removal:
3. Thread the Clutch Plate and Hub Assembly Remover J-33013 into the hub. Hold the body of the remover with a wrench and turn the center screw into the remover body to remove the clutch plate and hub assembly.
4. Remove the shaft key and retain for reassembly.
Install or Connect
Shaft Key, Clutch Plate Hub/Installation:
1. Install the shaft key into the hub key groove. Allow the key to project approximately 3.2mm (1/8") out of the keyway. The shaft key is curved slightly to provide an interference fit in the hub key groove.
2. Be sure the frictional surface of the clutch plate and the clutch rotor are clean before installing the clutch plate and hub assembly.
3. Align the shaft key with the shaft keyway and place the clutch plate and the hub assembly onto the compressor shaft.
NOTICE: Do not drive or pound on the clutch hub or shaft. Internal damage to compressor may result.
Installing Clutch Plate & Hub Assembly:
4. Remove the J-33013 remover - installer center screw and reverse the body direction on the center screw as shown in illustration.
5. Install the clutch plate and hub installer J-33013 with bearing as shown in illustration.
The body of the J-33013 installer should be backed off sufficiently to allow the center screw to be threaded onto the end of the compressor shaft.
6. Hold the center screw with a wrench. Tighten the hex portion of the Installer J-33013 body to press the hub onto the shaft. Tighten the body several turns, remove the installer and check to see that the shaft key is still in place in the keyway before installing the clutch plate and hub assembly to its final position. The air gap between frictional surfaces of the clutch plate and clutch rotor should be 0.38-0.64mm (0.015-0.025").
^ If the center screw is threaded fully onto the end of the compressor shaft, or if the body of the installer is held and the center screw is rotated, the key will wedge and break the clutch hub.
7. Remove installer J-3301 3, check for proper positioning of the shaft key (even or slightly above the clutch hub). Install the shaft nut. Hold the clutch plate and hub assembly with clutch hub holding tool J-33027 and using shaft nut socket J-33022, tighten the nut against the crankshaft shoulder to 11-22 N.m (8-16 ft. lbs.) torque, using a 0-35 N.m (0-25 ft. lbs.) torque wrench.
8. Spin the pulley rotor by hand to see that the rotor is not rubbing the clutch drive plate.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.