MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
338
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 5-17-2 Removing the engine accessories
Fig. 5-17-3 Removing the damping pulley and
the timing pulley of crankshaft
Fig. 5-17-4 Removing the timing hood and
belt
Removal
Preparation
Remove the earthing cable of storage battery.
Removing the engine accessories
①
(1) Remove the generator belt: rotate the tension pulley
with a tool to remove the generator belt after it is loosened
enough.
(2) Remove the tension pulley.
(3) Remove the flat idle wheel assembly and wedge idle
wheel assembly, as shown in Fig. 5-17-2.
Removing the damping pulley assembly
②
(1) Remove the 4 hexagon flange face bolts (M8×20) for
fastening the damping pulley at the front end of crankshaft.
See Fig. 5-17-3.
(2) Remove the damping pulley assembly from the front
end of crankshaft.
Removing the timing hood
③
(1) Remove the 6 hexagon flange face bolts (M6×16)
fastening the timing hood I, the 6 hexagon flange face bolts
(M6×16 and M10×50) fastening the timing hood II, and the
5 hexagon flange face bolts (M10×35) fastening the timing
hood. See Fig. 5-17-4.
(2) Take off the timing hood components I and II and the
timing hood from the front end of the engine, as shown in
Fig. 5-17-4.
Removing the timing belt
④
Release the timing tension pulley and then remove the
timing belt after it is loosened enough, as shown in Fig.
5-17-4.
Removing the timing pulley of crankshaft
⑤
(1) Remove the bolts tightening the timing pulley of
crankshaft.
(2) Remove the timing pulley of crankshaft and the
woodruff key from the front end of the crankshaft.
Damping pulley
Timing pulley of
crankshaft
