8. Cylinder / Piston
8-2
Precautions in Operation
General Information
z Both cylinder and piston service can be carried out when engine mounted on frame.
Specification
LF12 & LF18
Item Standard Limit
ID ( LF18 not included) 56.995~57.015 57.016
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 ( LF18 not included) 56.985~57.005 56.900
Clearance between piston and cylinder 0.010~0.040 0.100
Piston/
Piston ring
ID of piston pin boss 15.002~15.008 15.040
OD of piston pin 14.960~15.000 14.930
Clearance between piston and piston pin 0.002~0.014 0.020
ID of connecting rod small-end 15.016~15.034 15.060
LF18
Item Standard Limit
Cylinder ID 60.995~61.015 61.016
Piston OD of piston 60.985~61.005 60.900
Troubleshooting
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
Thermostat burnt
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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