MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
374
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 5-20-28 Inspection for open end of piston
ring
Fig. 5-20-30 Installing the piston connecting
rod group
0.07~0.09mm
Attention:
the front marks of the piston and the
connecting rod must face the front of the diesel engine.
See Fig. 5-20-29.
(6) Reinstall the connecting rod cover to its originally
matched connecting rod and install the connecting rod
bolts, and screw them by two steps down with required
torque.
Clearance between connecting rod big end and
crankshaft crank
0.22~0.37mm
Connecting rod bolts tightening torque
Step 1
Step 2
25N·
m±3N·
m
Angle 90°±5
Attention:
During the installation, the front mark of
the connecting rod cover shall face the front of
crankcase.
Installing the engine oil pump assembly
○
11
(1) Apply a small amount of lubricating oil to the engine
oil pump seal ring and insert the seal ring into the
bottom of the corresponding groove on the oil pump
housing without scratch, skew or impropriety.
(2) Coat the front oil seal of crankshaft with an
appropriate amount of lubricating oil, and install it to the
oil seal hole of the engine oil pump housing. After the
installation, there should not be any scratch, skew or
impropriety.
Installer of front oil seal: 5-8840-2361-0.
(3) Apply an appropriate amount of lubricating oil to the
inner surface of engine pump external rotor, and install
the external rotor to the engine pump cavity of the upper
cylinder body with the marks of internal and external
rotors on the same side. See Fig. 5-20-30.
Mobil API CI-4 lubricating oil
Open end of first
compression
ring
Spiral supporting
spring port
Open end of
oil ring
Front end mark
Open end of
second
compression
ring
Front
side
