Precautions In Operation; Trouble Diagnosis - TGB blade 300 Service Manual

7. CYLINDER/PISTON
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Precautions in Operation

General Information
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Both cylinder and piston service cannot be carried out when engine mounted on frame.
UA25A
Specification
Cylinder
Piston/
Piston ring
OD of piston pin
Clearance between piston and piston pin
ID of connecting rod small-end

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
7-2
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Item
ID
Bend
Clearance between piston
rings
Ring-end gap
nd
OD of piston (2 )
Clearance between piston and cylinder
ID of piston pin boss
70.995~71.015
Top ring 0.015~0.050
nd
2 ring 0.015~0.050
Top ring 0.150~0.300
nd
2 ring 0.300~0.450
Oil ring side rail 0.200~0.700
70.430~70.480
0.010~0.040
17.002~17.008
16.994~17.000
0.002~0.014
17.016~17.034
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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Unit：mm
Standard Limit
71.100
- 0.050
0.090
0.090
0.500
0.650
-
70.380
0.100
17.020
16.960
0.020
17.064