MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
418
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 7-2-11 Installing the timing hood
assembly
Fig. 7-2-12 Installing Damping pulley
Assembly
Fig. 7-2-13 Installing the engine accessory
(3) Install the timing belt and tighten timing tension
pulley assembling bolts by the specified torque. During
the installation, ensure that all pulleys (except the
tension pulley) shall closely fit the belt pulley and shall
not be slack.
Tightening torque for the fastening bolts of timing
tension pulley:
22 N·
m ~ 26 N·
m
(4) Install the timing hoods
Ⅰ
,
Ⅱ
, and the timing hood:
insert the timing hood sealing strips
Ⅰ
and
Ⅱ
separately
into the corresponding sealing grooves of timing hoods
I and II. Align the timing hood and the timing hoods I
and II respectively with their corresponding installation
holes. Mount 15 hexagon flange bolts (M6×16, M10×35
and M10×50) to the front end of cylinder head and the
cylinder body, and then tighten these bolts by the
required torques. See Fig. 7-2-11.
Tightening torques for the fastening bolts of
timing hood and timing hoods
Ⅰ
and
Ⅱ
:
M6
9 N•m ± 3 N•m
M10
45 N•m ± 3 N•m
Installing the damping pulley assembly
②
(1) Fit an elastic cylindrical pin into the pin hole of
crankshaft timing pulley.
(2) Align the pin hole of damping pulley, install the
damping pulley to the front end of crankshaft, and
mount and tighten 4 hexagon flange bolts (M8×20) by
the specified torque. See Fig. 7-2-12.
Tightening torque for the fastening bolts of
damping pulley:
23
N•m ± 3 N•m
Attention:
after installation, the timing mark must
face the front end.
Installing the engine accessory
①
(1)
Fit the flat and wedge idle wheels of accessory
separately to the water pump and timing hood, and
tighten them with bolts. See Fig. 7-2-13. See Fig.
7-2-13.
After the installation, any pulley non-coplanarity
Sealing strip
Sealing strip
Crankshaft
Timing pulley
Damping pulley
