2--36
62--11161
2.3.5 CYLINDER
0.
Top
A.
Middle
B.
Bottom (skirt)
a.
Right--angled to
Piston Pin
b.
Piston Pin Direction
1. Cylinder I.D.
(before correction)
2. Oversize Cylinder I.D.
2.3.5.a Cylinder Wear
1. Measure the I.D. of the cylinder at the six positions
(see figure) with a cylinder gauge to find the maxi-
mum and minimum I.D.’s.
2. Determine the difference (maximum wear) between
the maximum and minimum I.D.’s.
3. If the wear exceeds the allowable limit, bore and hone
to the oversize dimension. (Refer to Section
2.3.5.b)
4. Visually check the cylinder wall for scratches. If deep
scratches are found, the cylinder walls should be
bored. (Refer to Section
2.3.5.b
)
Cylinder Wear
Factory
Specification
67.000 to 67.019 mm
2.63779 to 2.63854 in.
Allowable
Limit
67.169 mm
2.64445 in.
2.3.5.b Correcting Cylinder (Ov0.25 mm)
1. When the cylinder is worn beyond the allowable limit,
bore and hone it to the specified dimension.
Cylinder I.D.
Factory
Specification
67.250 to 67.269 mm
2.647644 to 2.64839
in.
Maximum Wear
Allowable
Limit
67.400 mm
2.65354 in.
Finishing
Hone to 2.2 to 3.0 mm
μ
R max.
(0.000087 to 0.00012 in.
μ
R max.)
2. Replace the piston and piston rings with oversize
ones: (0.25 mm / 0.0098 in.)
Oversize
Part Name
Code Number
Marking
0.25 mm
0.0098 in.
Piston
16851--21900
025
0.25 mm
0.0098 in.
Piston Ring Assembly
16851--21090
025
