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7. CYLINDER/PISTON
PRECAUTIONS IN OPERATION
General Information
Ÿ Both cylinder and piston service cannot be carried out when engine mounted on frame.
Specification
ID
Bend/wrap age
Cylinder
Roundness
Cylindrical
Clearance between
piston and rings
Ring-end gap
Piston/
Piston ring
OD of piston
Piston OD measurement position
Clearance between piston and
cylinder
ID of piston pin hole
OD of piston pin
Clearance between piston and piston pin
ID of connecting rod small-end
TROUBLE DIAGNOSIS
Low Or Unstable Compression Pressure
l Cylinder or piston ring worn out.
l Compress pressure to high.
l Too much carbon deposited in
combustion chamber and piston.
Knock or Noise
l Cylinder or piston ring worn out.
l Carbon deposits on cylinder head
top-side.
7-2
Item
Standard
52.395~52.415
Less than 0.05
Less than 0.01
Less than 0.05
Top ring
0.05~0.105
nd
2
ring
0.05~0.105
Top ring
0.100~0.2500
nd
2
ring
0.300~0.500
Oil ring
0.200~0.700
52.385~52.405
Lower-end up 7mm
of piston skirt
0.005~0.015
15.002~15.008
14.994~15.00
0.002~0.014
l Piston pin hole and piston pin wear out.
Smoking in Exhaust Pipe
l Piston or piston ring worn out.
l Piston ring installation improperly.
l Cylinder or piston damage.5
Engine Overheat
l Carbon deposits on cylinder head top
side.
unit: mm
Limit
52.50
0.050
0.050
0.050
0.145
0.145
0.500
0.750
52.310
0.100
15.040
14.96
0.020
15
15.06
SYM
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