MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
202
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 4-7-2 Removing the engine accessories
Fig. 4-7-3 Removing the damping pulley
assembly
Fig. 4-7-4 Removing the timing system
Disassembly
Disassembling the engine accessories
①
(1) Remove the generator belt assembly: rotate the
tension pulley with tools until the belt is loose enough,
and then remove the generator belt.
(2) Remove the tension pulley. See Fig. 4-7-2.
(3) Remove the flat idle wheel assembly and wedge idle
wheel assembly.
(4) Remove the refrigeration compressor assembly:
loosen the 4 hexagon flange face bolts (M8×85)
fastening the refrigeration compressor and the left side
of the cylinder body, and remove the refrigeration
compressor.
(5) Remove the power steering pump and its bracket
component: loosen the 3 or 4 hexagon flange face bolts
(M8×30 and M8×100) fastening the power steering
pump and its bracket, and remove the power steering
pump; loosen the 3 hexagon flange face bolts (M8×25
and M8×30) fastening the steering pump bracket and
the cylinder body, and remove the steering pump
bracket.
(6) Remove the generator assembly and generator
bracket: loosen the 3 hexagon flange face bolts (M8×30
and M10×45) fastening the generator and its bracket,
and remove the generator; loosen the 4 hexagon flange
face bolts (M8×30 and M8×25) fastening the generator
bracket and the cylinder body, and remove the
generator bracket. See Fig. 4-7-2.
Disassembling the damping pulley assembly
②
(1)
Remove the 4 hexagon flange face bolts (M8×20)
fastening the damping pulley and the front end of
crankshaft. See Fig. 4-7-3.
(2) Remove the damping pulley assembly from the front
end of the crankshaft.
Disassembling the timing system
③
(1) Remove the timing hood component I, timing hood
component II and timing hood from the front end of
engine, and the rear timing hood component from the
front
end of cylinder head. See Fig. 4-7-4.
(2) Remove the timing tension pulley assembly: loosen
the fastening bolt of timing tension pulley and take off
the timing idle wheel. See Fig. 4-7-4.
(3) Remove the timing belt.
(4) Remove the timing idle wheel assembly: loosen the
fastening bolt of timing idle wheel and take off the timing
idle wheel.
(5) Remove the camshaft timing pulley: loosen the bolt
