Chapter V GW4D20 / GW4D20B Turbocharged Diesel Engine
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
329
Fig. 5-16-17 Installing the piston ring
Installing the piston and connecting rod assembly
⑦
(1) Select the connecting rod bearing shells as
specified. See Table 4-5-2 and Table 4-5-3.
(2) Apply lubricating oil to the cylinder bore, the
connecting rod bearing shell, the crank pin and the
surface of each piston ring and piston.
Mobil API CI-4 lubricating oil
(3) Stagger the three piston rings at the open end of
piston ring groove for installation. See Fig. 5-16-18.
After installation, check whether the position of the
open end of piston ring is correct.
(4) Use the piston ring compressor to install the piston
and connecting rod assembly to each cylinder, as
shown in Fig. 5-16-19.
Piston ring compressor: 5-8840-9018-0.
Attention:
The front mark on the piston top should
be toward the engine front.
Piston cylinder clearance
0.07~0.09mm
Fig. 5-16-18 Inspection for open end of piston
ring
Installing the connecting rod cover
⑥
Attention:
——The connecting rod and the connecting rod cover
should be in pair to ensure they can be reinstalled as
they are.
——Check the connecting rod bolt before installation
and replace it when there is any deformation,
elongation, pulled thread or other faults.
(1) The front end mark of the connecting rod cover
should be toward the front end of the crankcase for
installation.
(2) Install the connecting rod bolts to the connecting rod
cover and connecting rod and tighten them to the
specified torque by two steps. See Fig. 5-16-20.
Tightening torque for the connecting rod bolt
Step 1
Step 2
25N·
m±3N·
m
Turn it for 90°±5°
TOP mark
Compression ring
Open end of first
compression
ring
Spiral
supporting
spring port
Open end of
oil ring
Front end mark
Second
compression ring