(5) Remove cylinder head (para 3-53).
NOTE
(6) Compress valve spring (26, fig. 3-44) and
remove lock (17) from valve stem. Release valve spring
Valve removal and installation is
compressor and remove valve (19), seat (24), spring
covered under cylinder head and
(26), spacer (27), and guide (15). Remove seat (20) only
liner, paragraph 3-54 below.
when replacement is required.
(7) Repeat step (7) for the remaining 11
3-36. Valves and Operating Mechanism for Engine
valves.
Model D333TA
(8) Install valves and operating mechanism by
reversing the procedure in steps (1) through (8) above.
a. Removal and Installation.
b. Cleaning, Inspection, and Repair. Clean, inspect
(1) Remove rocker arm cover and gasket (TM
and repair in a manner similar to that described in
5-3810-201-12).
(2) Remove those cylinder head bolts that
clearances, and tolerances.
secure rocker arm shaft brackets to cylinder head.
(3) Remove rocker arm assembly from
c. Adjusting the Rocker Arm Clearance. After
cylinder head.
installation of the valves and operating mechanism,
(4) Refer to figure 3-44 and remove
adjust clearance of rocker arms (TM 5-3810-201-12).
components (1) through (11) and (14) from shaft (18).
Section XI. FLYWHEEL AND HOUSING
3-37. General
CAUTION
a. Engine Model 687C-18-ES.
The flywheel,
mounted on rear end of crankshaft, is designed to insure
Position a suitable lifting device,
a smooth flow of torque. It is cast from high alloy iron
attach a sling (cradle type). Do not
and is statically and dynamically balanced. Half inch
attempt to lift flywheel by manpower.
tapered puller holes are provided to facilitate removal of
flywheel. The ring gear is mounted on flanged edge of
(5) Remove flywheel.
flywheel and secured by a shrink fit. The flywheel
housing is secured to engine crankcase and rear plate,
NOTE
and covers the timing gear train. The rear plate serves
as a mounting surface for blower drive, starter motor,
At installation, torque the six
fuel injection pump drive, flywheel housing, and contains
mounting capscrews to between 95-
the timing gear train.
105 ft lb.
b. Engine Model D333TA. The flywheel of this
(6) Install flywheel by reversing procedures in
engine is also mounted on rear of crankshaft and is
steps (1) through (5) above.
balanced for even torque flow, but flywheel housing does
not enclose timing gear train. It serves as a mounting
NOTE
place for starter motor.
Use dial indicator on face of flywheel,
3-38. Flywheel for Engine Model 687C-18-ES
and rotate flywheel. Maximum runout
must not exceed 0.005 inch. If runout
a. Removal and Installation
is excessive, remove it and check for
obstructions
between
mating
(1) Remove power take-off and clutch (para
surfaces.
(2) Bend lips on the three lockplates and
b. Cleaning, Inspection, and Repair.
remove the six capscrews securing flywheel to
crankshaft (fig. 3-65).
(1) Clean and dry thoroughly before
(3) Use two of the capscrews and install them
inspection or reinstallation.
in the puller screw holes.
(2) Inspect flywheel for cracks, corrosion, or
(4) Turn the two screws alternately and evenly
warping. Inspect ring gear for cracks, loose fit, or
until flywheel is loose and can be removed from dowel
damaged teeth.
pins and flywheel housing.
AGO 20051A
3-55
