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7-2 Precautions In Operation
General Information
y
Both cylinder and piston service cannot be carried out when engine mounted on frame.
UA25A
Specification
Unit
:
mm
Item Standard
Limit
ID 74.995~75.015
75.100
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
) 74.430~75.480
75.380
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
7-3 Trouble Diagnosis
Low or Unstable Compression Pressure
y
Cylinder or piston ring worn out
Knock or Noise
y
Cylinder or piston ring worn out
y
Carbon deposits on cylinder head top-side
y
Piston pin hole and piston pin wear out
Smoking in Exhaust Pipe
y
Piston or piston ring worn out
y
Piston ring installation improperly
y
Cylinder or piston damage
Engine Overheat
y
Carbon deposits on cylinder head top side
y
Cooling pipe clogged or not enough in coolant
flow
To this chapter contents
Summary of Contents for ET300 - SERVICE
Page 1: ...1 ET 300 Service Manual ...
Page 142: ...REAR BRAKE ...
Page 160: ......
Page 161: ...17 8 Wiring Diagram ...