5-30
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)
