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9. CYLINDER/PISTON
Precautions in Operation
General Information
Both cylinder and piston service cannot be carried out when engine mounted on frame.
Specification
ID
Cylinder
Bend
Clearance between piston
rings
Ring-end gap
Piston/
Piston ring
OD of piston
Clearance between piston and cylinder
ID of piston pin boss
OD of piston pin
Clearance between piston and piston pin
ID of connecting rod small-end
Cylinder
ID
Piston
OD of piston
Trouble Diagnosis
Low or Unstable Compression Pressure
Cylinder or piston ring worn out
Knock or Noise
Cylinder or piston ring worn out
Carbon deposits on cylinder head top-side
Piston pin hole and piston pin wear out
9-2
Item
Top ring
nd
2
ring
Top ring
nd
2
ring
Oil ring side rail
Item
Unit：mm
Standard
57.400~57.415
-
0.015~0.050
0.015~0.050
0.150~0.300
0.300~0.450
0.200~0.700
57.400~57.405
0.010~0.040
15.002~15.008
14.960~15.000
0.002~0.014
15.016~15.034
Standard
57.395~57.415
57.385 ~57.405
Smoking in Exhaust Pipe
Piston or piston ring worn out
Piston ring installation improperly
Cylinder or piston damage
Engine Overheat
Carbon deposits on cylinder head top side
Cooling pipe clogged or not enough in coolant
flow
Limit
57.416
0.050
0.090
0.090
0.500
0.650
-
57.390
0.100
15.040
14.930
0.020
15.060
Limit
57.416
57.300
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