MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
28
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Table 2-6-2 Tightening Torque Standards for General Fasteners of GW4D20/GW4D20B
Turbocharged Diesel Engine
Sequence
No.
Fastener
Specification
Torque
Limit
(N·
m)
Remarks
Sequence
No.
Fastener
Specification
Torque
Limit
(N·
m)
Remarks
1
M6 x1
9±3
Performance
grade 8.8,
please refer to
QC
／
T
518-1999
4
M10 x1
45±3
Performance
grade 8.8,
please refer to
QC
／
T
518-1999
2
M8 x1
25±3
5
M10 x1.25
45±3
3
M8 x1.25
23±3
6
M12 x1.75
95±10
2. Fit Clearance of Main Parts of Engine
For the fit clearances of main parts of GW4D20/GW4D20B turbocharged diesel engine, see Table 2-6-3.
Table 2-6-3 Fit Clearances of Main Parts of GW4D20/GW4D20B Turbocharged Diesel Engine.
Sequence
No.
Name of Fit Clearance of Parts
Fit Clearance Value (mm)
Remarks
1
Camshaft axial clearance
0.060~0.115
See Page 153, 210,
220, 230, 293
2
Crankshaft axial clearance
0.10~0.28
See Page 131, 165,
275, 288
3
Side clearance between piston ring
and piston ring groove
0.055 ~ 0.100 (the first
compression ring)
0.035 ~ 0.080 (the second
compression ring)
0.030 ~ 0.070 (oil ring
component)
See Page 147, 150,
257
4
Opening clearance of piston ring
0.20 ~ 0.40 (the first
compression ring)
0.65~0.85 (the second
compression ring)
0.25 ~ 0.50 (oil ring
component)
See Page 146, 150,
257
5
Clearance between big end of
connecting rod and crankshaft crank
0.22~0.37
See Page 151, 258,
276, 290
6
Piston cylinder clearance
0.07~0.09
See Page 150, 258,
276, 290
7
Clearance between piston pin and
piston pin hole
0.005~0.012
See Page 147, 149
8
Clearance between piston pin and
connecting rod small end hole
0.010~0.024
See Page 147, 149
For the matching selection by group for the main shaft bearing shell of the turbocharged diesel engine
GW4D20/GW4D20B , see Table 2-6-4.
