SERVICE MANUAL
VALVE TRAIN - CAMSHAFT, TAPPETS & PUSH RODS
Section 4
REMOVAL
NOTE: Prior to removal, or if complete tear down will
not take place, cam lobe lift can be Inspected with
camshaft In engine by using a dial Indicator as
shown in Figure II. Record the lift readings of each
lobe and compare these readings with those In the
specifications. If wear is 0.51 mm (0.020 in) or
greater replace the CAMSHAFT.
Figure 11. - Checking Cam Lobe Lift (Camshaft in
Engine)
Remove Valve Train as Follows:
1.
Remove Turbocharger (if equipped), manifolds,
valve cover and cylinder head as described in
previous sections.
2.
Remove push rods.
3.
Remove valve tappets.
NOTE: Mark the tappets as to location in the engine
block, so they can be returned to their original
position.
4.
Remove crankcase front cover. (Refer to
section 7).
5.
Crank engine until timing marks on crankshaft
gear, camshaft gear and Idler gear are in line as
shown in Fig. 12.’
Figure 12. - Gear Train Timing Marks
1.
Crankshaft Gear
2.
Idler Gear
3.
Camshaft Gear
UTDS*
4.
Injection Pump Gear
Model 100
5.
Tachometer Gear
Fuel Injection
(if equipped)
Pump
6. Injection Pump
Engines equipped with
Gear
Robert Bosch Model MW
Fuel Injection Pump
NOTE: Before removing the camshaft gear, check
the camshaft end clearance. If
0.13 mm (0.005 inches)
0.33 mm (0.013 inches)
specification is not met new parts are required.
6.
Remove two cap screws securing camshaft
thrust plate to crankcase. These screws are
accessible by rotating camshaft gear and
reaching through the holes in the gear.
7.
Remove camshaft. (Support camshaft along its
length, as it is being removed, to prevent cam
lobes from damaging bushings).
*United
Technologies
Diesel
Systems
(formerly AM BAC)
CGES-185-3
PRINTED IN UNITED STATES OF AMERICA
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