TM 5-3810-206-35
Section XI. FLYWHEEL AND HOUSING
Note. When necessary to replace a
3-37.
General
ring gear, the old gear may be cut off
a. Engine Model 687C-18-ES.
The flywheel,
the flywheel.
Clean surface of
mounted on rear end of crankshaft, is designed to insure
flywheel then heat ring gear at 600 F
a smooth flow of torque. It is cast from high alloy iron
in oil before pressing in place. Allow
and is statically and dynamically balanced. Half inch
gear to cool for a shrink fit. Install
tapered puller holes are provided to facilitate removal of
ring gear with chamfer at teeth
flywheel. The ring gear is mounted on flanged edge of
toward starter motor when flywheel is
flywheel and secured by a shrink fit. The flywheel
installed.
housing is secured to engine crankcase and rear plate,
(3) Repair by replacing a defective ring gear.
and covers the timing gear train. The rear plate serves
Replace a cracked, corroded, or warped flywheel.
as a mounting surface for blower drive, starter motor,
fuel injection pump drive, flywheel housing, and contains
3-39.
Flywheel for Engine Model D333TA
the timing gear train.
b. Engine Model D333TA. The flywheel of this
a. Removal and Installation.
engine is also mounted on rear of crankshaft and is
(1) Remove power-take-off a d clutch (para 3-
n
balanced for even torque flow, but flywheel housing does
not enclose timing gear train. It serves as a mounting
(2) Release engine compression and rotate the
place for starter motor.
crankshaft until the alignment mark on flywheel is near
top center of flywheel housing.
3-38.
Flywheel for Engine Model 687C-18-ES
(3) Remove two of the nine flywheel retaining
bolts from opposite sides of crankshaft and install two
a. Removal and Installation.
guide studs (fig. 3-46).
(1) Remove power take-off and clutch (para 3-
(4) Remove remaining seven retaining bolts
then slide flywheel off crankshaft onto guide studs,
(2) Bend lips on the three lockplates and
attach suitable lifting device and remove flywheel from
remove the six capscrews securing flywheel to
crankshaft.
crankshaft (fig. 3-65).
(5) Install flywheel by reversing procedure in
(3) Use two of the capscrews and install them in
steps (1) through (4) above.
the puller screw holes.
b. Cleaning, Inspection, and Repair.
Clean,
(4) Turn the two screws alternately and evenly
inspect, and repair flywheel in a manner similar to that
until flywheel is loose and can be removed from dowel
described in paragraph 3-38b above.
pins and flywheel housing.
Caution: Position a suitable lifting
3-40.
Flywheel Housing (Engine Model 687C-18-
device, attach a sling (cradle type).
ES)
Do not attempt to lift flywheel by
manpower.
a. Removal and Installation.
(5) Remove flywheel.
(1) Remove engine (para 2-9).
Note. At installation, torque the six
(2) Remove starter motor and solenoid (TM 5-
mounting capscrews to between 95-
3810-206-12).
105 ft-lb.
(3) Remove flywheel (para 3-38).
(6) Install flywheel by reversing procedures in
(4) Remove oil pan (para 3-43).
steps (1) through (5) above.
(5) Remove
capscrews
(31,
Note. Use dial indicator on face of
lockwashers (32), and flatwashers (33) securing housing
flywheel,
and
rotate
flywheel.
(7) to engine.
Maximum runout must not exceed
(6) Remove nuts (3, fig. 8-18), lockwashers (2),
0.005 inch. If runout is excessive,
and capscrews (30, fig. 3-45) securing flywheel housing
remove it and check for obstructions
(7) to rear plate (16).
between mating surfaces.
(7) Remove housing (7) from rear plate (16) and
b. Cleaning, Inspection, and Repair.
discard gasket (11).
(1) Clean and dry thoroughly before inspection
(8) Remove four capscrews (1), lockwashers
or reinstallation.
(2), flatwashers (3), then remove injection pump drive
(2) Inspect flywheel for cracks, corrosion, or
cover (28) and gasket (27) from housing (7).
warping. Inspect ring gear for cracks, loose fit, or
(9) Remove eyebolt (6), stud (18), and stud (25)
damaged teeth.
if required.
(10) Loosen adjustment screw (8), then remove
3-55
