Chpter IV Mechanical System
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
187
Table 4-5-1 Clearance for the piston ring of the turbocharged diesel engine GW4D20/GW4D20B
Clearance between the piston
ring and the piston ring groove
Clearance of piston ring open
end
First compression ring
0.055~0.100mm
0.200~0.400mm
Second compression ring
0.035~0.080mm
0.650~0.850mm
Oil ring component
0.030~0.070mm
0.250~0.500mm
Reinstalling the piston and connecting rod assembly
⑥
(1) Matching select the connecting rod bearing shell according to Table 4-5-2 and Table 4-5-3.
Table 4-5-2 Matching selection for the main shaft bearing shell of the turbocharged diesel engine
GW4D20/GW4D20B Unit: mm
Color code of connecting rod
shaft bearing shell
Connecting rod bearing journal of crankshaft
1
2
3
Φ50.021
～
φ50.026
Φ50.015
～
φ50.020
Φ50.008
～
φ50.014
Connecting
rod big end
hole
diameter
1
Φ53.000
～
φ53.006
Yellow
（
1
）
Shell
thickness:
1.473~1.477
Clearance:
0.020~0.040
Yellow
（
1
）
Shell
thickness:
1.473~1.477
Clearance:
0.026~0.046
None
（
2
）
Shell
thickness:
1.477~1.481
Clearance:
0.024~0.044
2
Φ53.007
～
φ53.012
Yellow
（
1
）
Shell
thickness:
1.473~1.477
Clearance:
0.026~0.046
None
（
2
）
Shell
thickness:
1.477~1.481
Clearance:
0.024~0.044
Blue
（
3
）
Shell
thickness:
1.481~1.485
Clearance:
0.022~0.042
3
Φ53.013
～
φ53.018
None
（
2
）
Shell
thickness:
1.477~1.481
Clearance:
0.024~0.044
Blue
（
3
）
Shell
thickness:
1.481~1.485
Clearance:
0.022~0.042
Blue
（
3
）
Shell
thickness:
1.481~1.485
Clearance:
0.028~0.048
Table 4-5-3 Matching selection for the connecting rod bearing shell of the turbocharged diesel engine
GW4D20/GW4D20B
Connecting rod big end hole
diameter group
connecting rod bearing shell
group number
Main shaft bearing shell color
code (number)
Fit clearance
=2-3
Yellow (1)
0.020
～
0.046 mm
=4
None (2)
0.024
～
0.044 mm
=5-6
Blue (3)
0.022
～
0.048 mm
