TRUCK SERVICE MANUAL
Inspect each rebuilt unit before installing it on the engine.
Check Fuel Pump Calibration
Be sure all units are clean and that all capscrews, nuts
and bolts are tight. Install units on engine in convenient
Replace Bellows And Calibrate Aneroid
Clean Turbocharger Compressor Wheel And Diffuser
At each "D" Check replace aneroid bellows. This can be
Keep the compressor wheel and diffuser clean for best
accomplished without changing aneroid settings if
turbocharger performance. Any buildup of dirt on the
precautions are taken to assure that same spring and
compressor wheel will choke off air flow and cause rotor
shims are reinstalled.
1. Remove flexible hose or tube from aneroid cover to
At every "D" Check, clean the compressor wheel and
diffuser. Refer to FUEL SYSTEM, Intake Air System
2. Remove lead seal or file away end of rivet type seal,
3. Remove screws and aneroid cover.
Check Turbocharger Bearing Clearance
4. Remove capscrew or self-locking nut and retaining
Check bearing clearances. This can be done without
washer securing bellows to shaft and piston.
removing the turbocharger from the engine, by using a
5. Clean bellows sealing area on body and cover.
dial indicator to indicate end-play of the rotor shaft and a
6. Install new bellows, align holes in bellows with
feeler gauge to indicate radial clearance.
corresponding holes in aneroid body. Position retaining
washer over bellows and secure with capscrew or self-
1. Remove exhaust and intake piping from the
7. Position cover to body; secure with flatwashers,
turbocharger to expose ends of rotor assembly.
2. Remove one capscrew from the front plate
(compressor wheel end) and replace with a long
Pump calibration instructions for sealing instructions and
capscrew. Attach an indicator to the long capscrew and
register indicator point on end of rotor shaft. Push shaft
9. Reinstall flexible hose or tube from aneroid cover to
from end-to-end making note of total indicator reading.
end clearance should be 0. to 0.020 inch [0.08 to 0.51
Clean Complete Oil Bath Air Cleaner (As Required)
3. Check radial clearance on compressor wheel only.
a. Push wheel toward side of bore.
b. Using feeler gauge, check distance between tip of
Steam clean the oil bath air cleaner main body screens.
wheel vanes and bore.
Direct the steam jet from the air outlet side of the cleaner
be 0.003 to 0.033 inch [0.08 to 0.84 mm].
to wash dirt out in the opposite direction of air flow.
4. If end clearance exceeds limits, remove
turbocharger from engine and replace with a new or
Solvent-bath cleaning requires a 55-gallon drum and a
5. Install exhaust and intake piping to turbocharger.
source of air pressure. Any good commercial solvent
may be used.
Inspect/Install Rebuilt Unit As Necessary
At this time the following assemblies should be inspected
1. Steam clean exterior of cleaner.
and rebuilt as necessary in a well-equipped shop by
2. Remove air cleaner oil cup.
mechanics thoroughly familiar with worn replacement
3. Clamp hose with air line adapter to air cleaner outlet.
limits and disassembly and assembly procedures:
4. Submerge air cleaner in solvent.
5. Introduce air into unit at 3 to 5 psi [21 to 34 kPa] and
Lubricating Oil Pump
leave in washer 10 to 20 minutes.