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32) Inspection of Piston Outer Diameter
1.
Measure the piston outer diameter between the specified
points. Replace if less than the specified value.
Piston Outer Diameter a: Standard Value
60.960 mm (2.4000 in)
Measurement Point b:
10 mm (0.3937 in) above piston skirt bottom
Functional Limit:
60.90 mm (2.3976 in)
33) Inspection of Cylinder Inner Diameter
1.
Measure the cylinder inner diameters (D1 to D6) at
measurement points a, b and c, taking measurements
of D1, D3, and D5 d in the direction of the crankshaft and
taking measurements of D2, D4, and D6 e in the direction
of the crank web.
Cylinder Inner Diameters (D1 to D6):
Standard Value
61.00 mm (2.4016 in)
Functional Limit:
61.06 mm (2.4039 in)
• T h e c y l i n d e r i n n e r d i a m e t e r s h o u l d b e
measured at the sections where the wear is the
largest.
• Clean the cylinder if necessary.
2.
Calculate the taper limit as shown below. Replace the
cylinder block if greater than the specified value.
Taper Limit:
D1–D5 (Direction d)
D2–D6 (Direction e)
Functional Limit:
0.08 mm (0.0031 in)
3.
Calculate the out-of-roundness limit as described below.
Replace the cylinder block if greater than the specified
value.
Out-of-roundness limit:
D2–D1 (Measurement Point a)
D6–D5 (Measurement Point c)
Functional Limit:
0.06 mm (0.0024 in)
4st 25/30 2022
D1
D3
D5
a 6 mm (0.2362 in)
d Crankshaft direction
b 38 mm (1.4961 in)
e Crank web direction
c 76 mm (2.9921 in)
D2
D4
D6
5
5-67
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