K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
the body several turns, remove J 9480-B and check that the shaft key (36) is properly in place in the keyway.
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Air gap between contact surfaces of the clutch plate and hub assembly (2) and the pulley (6) should be 0.56-1.34 mm (0.022-0.057-inch).
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Remove J 9480-B.
Inspect
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Position of the shaft (39) (even with or slightly above the clutch hub).
3. Shaft nut (1).
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Use J 9396 to hold the clutch plate and hub assembly (2).
Tighten
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Shaft nut (1) to 27 N.m (20 ft. lbs.) with J 9399.
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Hand spin the pulley (6) to check for free rotation.
Pulley and Bearing Assembly
