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ENGINE/ TOP END
TOP END PARTS INSPECTION
NOTE
Before reinstall the piston and piston pin measure all dimensions
if they are within the limits.
ITEM
Cylinder inner diameter
Cylindrically
Cylinder
Roundness
Flatness
Piston pin hole inner diameter
Piston pin outer diameter
Piston outer diameter
Clearance between piston and piston pin
Piston
Clearance between the piston
ring and piston ring groove
Joint clearance of piston ring
Connecting rod small end inner diameter
Connection rod
Clearance between linkage rod and piston pin
CYLINDER INSPECTION
1. Inspect the abrasion and the wear of the cylinder inner wall.
2. Measure the cylinder bore with an subito at three levels of A,
B and C.
Allowable service limit: 40.3 mm
3. Check if the cylinder is broken. Check for any carbon deposi-
tion. If necessary replace it.
STANDARD VALUE
40.27 - 40.28
12.002 - 12.008
11.994 - 12
40.22 - 40.23
0.002 - 0.014
Top ring
0.015 - 0.05
Second ring
0.015 - 0.05
Top ring
0.1 - 0.25
Second ring
0.1 - 0.25
14.995 - 15.006
0.002 - 0.014
ALLOWABLE LIMIT
[mm]
---
---
---
78
[mm]
40.3
0.05
0.05
0.05
12.04
11.96
40.2
0.08
0.9
0.9
0.5
0.5
15.06
0.08
A
B
C
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