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CYLINDER AND PISTON
2. Measure:
• Piston-to-cylinder clearance
Piston-to-cylinder clearance
measurement steps:
1st step:
• Measure the cylinder bore C with the cylin-
der bore gauge.
TIP
Measure the cylinder bore C in parallel to and
at right angles to the crankshaft. Then, find
the average of the measurements.
Cylinder bore "C"
Taper limit "T"
Out of round "R"
"C" =
maximum of D
"T" =
maximum of D
maximum of D
"R" =
maximum of D
minimum of D
• If out of specification, replace the cylinder,
and replace the piston and piston rings as
set.
2nd step:
• Measure the piston skirt diameter P with a
micrometer.
a 5 mm (0.20 in) from the piston bottom edge.
Standard
• If out of specification, replace the piston and
piston rings as a set.
3rd step:
• Calculate the piston-to-cylinder clearance
with following formula.
Piston-to-cylinder clearance =
Cylinder bore "C" -
Piston skirt diameter "P"
Piston-to-cylinder clearance:
0.020 ~ 0.026 mm
(0.0008 ~ 0.0010 in)
<Limit>: 0.15 mm (0.006 in)
4-34
ENG
54.000 ~ 54.019 mm
(2.126 ~ 2.127 in)
0.05 mm (0.002 in)
0.05 mm (0.002 in)
~ D
1
6
, or D
-
1
2
or D
5
6
, D
or D
-
1
3
5
, D
or D
2
4
6
Piston size P
53.977 ~ 53.996 mm
(2.1251 ~ 2.1258 in)
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