MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
158
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig.4-4-2 Removing the engine accessories
Fig. 4-4-3 Removing the damping pulley
assembly
Fig. 4-4-4 Removing the timing system
Disassembly
Disassembling the engine accessory
①
(1) Removing the generator belt: Rotate the tension
pulley with a tool to disassemble the generator belt
when it is loose enough.
(2) Remove the tension pulley. See Fig. 4-4-2.
(3) Remove the flat idle wheel assembly and the wedge
idle wheel assembly.
(4) Removing the refrigeration compressor assembly:
Unscrew the 4 hexagon flange face bolts (M8×85)
fastening the refrigeration compressor to the left side of
the cylinder body, and remove the refrigeration
compressor assembly.
(5) Removing the engine bracket and the engine
assembly: Unscrew the 3 hexagon flange face bolts
(M8×30, M10×45) fastening the engine to the engine
bracket, and remove the engine; unscrew the 4
hexagon flange face bolts (M8×30, M8×35) fastening
the engine bracket to the cylinder body, and remove the
engine bracket.
(6) Removing the power steering pump assembly and
the steering pump support components: Unscrew the 3
or 4 hexagon flange face bolts (M8×30, M8×100)
fastening the power steering pump to the steering pump
support, and remove the power steering pump;
unscrew the 3 hexagon flange face bolts (M8×25,
M8×30) fastening the steering pump support to the
cylinder body, and remove the steering pump support.
Disassembling the damping pulley assembly
②
(1) Remove the 4 hexagon flange face bolts (M8×20)
for fastening damping pulley at the front end of
crankshaft. See Fig. 4-4-3.
(2) Remove the damping pulley assembly from the front
end of crankshaft.
Disassembling the timing system
③
(1) Remove timing hood components I and II, the timing
hood and the rear timing hood components.
(2) Removing the timing tension pulley assembly:
Loosen the combined fastening bolt of timing tension
pulley and remove the timing tension pulley. See Fig.
4-4-4.
(3) Remove the timing belt. See Fig. 4-4-4.
(4) Remove the timing idle wheel: Unscrew the
fastening bolts of timing idle wheel, and remove the
timing idle wheel. See Fig. 4-4-4.
