TRUCK SERVICE MANUAL
ENGINE
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
Check fuel pump calibration on engine if required. To
and bolts are tight. Install units on engine in convenient
calibrate fuel pump refer to FUEL SYSTEM Fuel Pump
sequence;
Calibration Instructions.
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.
imbalance.
1. Remove flexible hose or tube from aneroid cover to
At every "D" Check, clean the compressor wheel and
intake manifold.
diffuser. Refer to FUEL SYSTEM, Intake Air System
2. Remove lead seal or file away end of rivet type seal,
(Turbochargers).
if used.
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-
Checking Procedure
locking nut.
1. Remove exhaust and intake piping from the
7. Position cover to body; secure with flatwashers,
turbocharger to expose ends of rotor assembly.
lockwashers and fillister head screws.
2. Remove one capscrew from the front plate
8. Install new seal. Refer to FUEL SYSTEM, Fuel
(compressor wheel end) and replace with a long
Pump calibration instructions for sealing instructions and
capscrew. Attach an indicator to the long capscrew and
calibrating.
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.
intake manifold.
end clearance should be 0. to 0.020 inch [0.08 to 0.51
mm].
Clean Complete Oil Bath Air Cleaner (As Required)
3. Check radial clearance on compressor wheel only.
a. Push wheel toward side of bore.
Steam
b. Using feeler gauge, check distance between tip of
Steam clean the oil bath air cleaner main body screens.
wheel vanes and bore.
clearance should
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-Air Cleaning
rebuilt unit.
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.
Fan Hub
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.
Air Compressor
Injectors
Fuel Pump
302
