7. Cylinder / Piston
7-2
Precautions in Operation
General Information
Both cylinder and piston service cannot be carried out when engine mounted on frame.
Specification Unit：mm
Item Standard Limit
ID 72.995~73.015 73.100
Cylinder
Bend - 0.050
Top ring 0.015~0.050 0.090
Clearance between piston
rings
2
nd
ring 0.015~0.050 0.090
Top ring 0.150~0.300 0.500
2
nd
ring 0.300~0.450 0.650
Ring-end gap
Oil ring side rail 0.200~0.700 -
OD of piston (2
nd
) 72.430~72.480 72.380
Clearance between piston and cylinder 0.010~0.040 0.100
Piston/
Piston ring
ID of piston pin boss 17.002~17.008 17.020
OD of piston pin 16.994~17.000 16.960
Clearance between piston and piston pin 0.002~0.014 0.020
ID of connecting rod small-end 17.016~17.034 17.064
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
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
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