D 350 Pickup L6-359 5.9L DSL (1989)
Remove the compressor housing and inspect for impeller contact.
Remove the square cut 0-ring.
Remove the impeller nut.
CAUTION: Turn the nut to the right to loosen. The nut and shaft have left hand threads.
Remove the impeller and inspect the blades for damage.
CAUTION: The wheel and shaft assembly is balanced as a unit. If the impeller is damaged the complete assembly must be replaced.