Precautions In Operation; Trouble Diagnosis - DAELIM ET-250 Service Manual

7-2 Precautions in Operation

General Information
Ÿ Both cylinder and piston service cannot be carried out when engine mounted on frame.
Specification of CYLINDER
ID
Cylinder
Bend
Clearance between piston
rings
Ring-end gap
Piston/
Piston ring
OD of piston (2
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

7-3 Trouble Diagnosis

Low or Unstable Compression Pressure
Ÿ Cylinder or piston ring worn out
Knock or Noise
Ÿ Cylinder or piston ring worn out
Ÿ Carbon deposits on cylinder head top-side
Ÿ Piston pin hole and piston pin wear out
Item
Top ring
nd
2 ring
Top ring
nd
2 ring
Oil ring side rail
nd
)
Standard
70.995~71.015
-
0.015~0.050
0.015~0.050
0.150~0.300
0.300~0.450
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
Ÿ Piston or piston ring worn out
Ÿ Piston ring installation improperly
Ÿ Cylinder or piston damage
Engine Overheat
Ÿ Carbon deposits on cylinder head top side
Ÿ Cooling pipe clogged or not enough in
coolant flow
Limit
71.100
0.050
0.090
0.090
0.500
0.650
-
70.380
0.100
16.970
16.960
0.020
17.064