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5-25
POWR
E
PISTONS
4. Calculate:
● Piston-to-cylinder clearance
Out of specification → Replace the
piston, piston rings and cylinder as a
set.
Cylinder and piston combination
Select the appropriate piston to match the
cylinder size by the table as follows.
NOTE:
New cylinder bore size = 80.000 + a/1,000
Example: a = 12 → 80.012 mm.
PISTON
CLEARANCE
=
CYLINDER
BORE
–
PISTON
DIAMETER
Piston-to-cylinder clearance:
0.100–0.105 mm
(0.0039–0.0041 in)
Cylinder size
indication a
Piston color mark
0–5 Red
6–10 Orange
11–15 Green
16–18 Purple
Piston ring inspection
1. Measure:
● Side clearance
(with a thickness gauge 1)
Out of specification → Replace the
piston and piston rings as a set.
Side clearance:
0.03–0.05 mm (0.001–0.002 in)
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