TM 5-3810-206-35
b. Engine Model D333TA. The timing gear train of
2 Position puller and remove gear (3)
this engine is located at front end, and consists of an
from shaft (6).
accessory drive gear, camshaft gear, accessory drive
(e) Oil pump drive gear.
idler gear, crankshaft gear, oil pump inner gear, and an
1 Remove ring (15).
oil pump drive gear.
2 Position puller and remove gear
(14).
c. Rear Plate Removal.
3-30.
Rear Plate and Timing Gear Train (Engine
(1) Remove 12 capscrews (2).
Model 687C-18-ES)
(2) Remove rear plate (1) and gasket from
a. Preparation for Removal.
(1) Remove engine (para 2-9).
d. Installation. Assemble and install by
(2) Remove flywheel housing (para 3-40).
reversing the procedures described in a through c
b. Removal of Timing Gear Train and Drive Gears.
above. Align timing marks.
(1) Blower drive gear removal and disassembly.
e. Cleaning, Inspection, and Repair.
(a) Remove four bolts (20, fig. 3-38) and
(1) Clean all parts and dry thoroughly before
flatwashers (21) securing adapter (15) and housing (13)
inspection or reassembly.
to plate (2).
(2) Inspect all gears for chipped, broken, or
(b) Remove adapter (15) and gasket (14)
worn teeth. Inspect shafts for straightness or wear. Use
then slide blower drive out of plate (2).
(c) Remove ring (8).
(3) Repair by replacing damaged or excessively
(d) Remove plug (16) from housing (13).
worn components.
(e) Remove bearing retainer (9) front ring
f. Timing the Engine.
spacer (11) and sleeve bearing (10) from housing (13).
(1) The idler gear (20, fig. 3-39) is the mating
(f) Remove spur gear (12) from housing
gear for all others in the gear train. The face of this gear
(13).
has two letters "O" (19) and "T" (26).
(g) Remove shaft (17) from spur gear (12),
(2) When the No. 1 piston is at top dead center,
and rear ring spacer (11) and sleeve bearing (10) from
the "O" on idler gear and the "O" on crankshaft gear (17)
housing (13).
must coincide. The "T" on idler gear and "T" on
(2) Timing gears and drive gears removal and
camshaft gear (11) must coincide at the same instant the
disassembly.
"O" marks are aligned.
(a) Idler gear.
(3) Line up the "6" injection pump gear timing
mark (5) on injection pump drive gear (3) which
from thrust flange (22).
corresponds to the number of cylinders in the engine,
2 Remove thrust flange (22).
with the TDC mark (4) on rear plate (1).
then slide idler gear (3) off plate (2) and remove
3-31.
Front Cover and Timing Gear Train (Engine
remaining thrustwasher (4).
Model D333TA)
4 Remove bearing (5) from gear (3).
5 Remove plate (2) and gasket (1)
a. Front Cover Removal.
from rear plate (1), fig. 3-39).
(1) Remove engine (para 2-9).
(b) Cam gear.
(2) Remove all accessories that will interfere
1 Remove nut (9) from camshaft (8).
with front cover removal.
2 Use a puller and remove gear (11)
(3) Remove bolt (25, fig. 3-40), lockwasher (24),
from the crankshaft.
and flatwasher (23), then use puller to remove
(c) Crankshaft gear.
crankshaft pulley (18).
1 Remove four bolts (12) from
(4) Remove six capscrews (21), lockwashers
crankshaft gear (17).
(20) and damper (19) from crankshaft. Remove two pins
2 Position a puller and remove gear
(22) when necessary.
(17) from the crankshaft.
(5) Remove bolts (28 and 33) and lockwashers
(d) Fuel injection pump drive gear.
(27 and 32), then remove support (26), shims (29, 30
1 Remove nut (7).
and 31), seal (34), and bushings (35).
(6) Remove five nuts (1), lockwashers (2).
3-47
