6-38. TURBOCHARGER REPAIR (Cont)
Before cleaning, inspect parts for signs of burning, rubbing, or other damage which
might not show after cleaning.
(1) Soak all part is in dry cleaning solvent for 25 minutes. Using a stiff bristle brush, remove all
dirt particles. Dry all parts thoroughly.
Compressed air used for cleaning purposes will not exceed 30 PSI. Use
only with effective chip guarding and personal protective equipment
(goggles/shield, gloves, etc).
(2) Using compressed air, blow clean all internal cavities and oil passages in center housing.
Inspect all parts for signs of damage, corrosion, or deterioration. Check for nicked, crossed,
or stripped threads.
Check turbine wheel for signs of rubbing or wear.
Inspect shaft for signs of scoring, scratches, or bearing seizure,
Check impeller for signs of rubbing or blade damage. Check wheel
Inspect seal parts for signs of rubbing or scoring of running faces.
Inspect turbine nozzle for erosion and bent vanes.
Inspect diffuser for dirt and foreign matter.
bore for galling.
Inspect center housing, compressor housing, and turbine housing for contact with rotating
Replace thrust washer if faces are worn unevenly or scratched excessively.
Smooth or polish minor surface damage. Use silicone carbide abrasive cloth for aluminum
parts and crocus cloth for steel parts.
(1)If removed, install two pins (48) in compressor end of center housing assembly (1 2). Pins
must extend 0.075 to 0.085 inch above surface.
(2) Install gasket (46) and diaphragm (45) on center housing assembly (12). Aline holes in
diaphragm (45) to holes in center housing.
Place four bolts through diaphragm and center housing holes to prevent diaphragm
from turning when torquing back plate.