Yamaha 4TX-AE1, Service Manual

Page: 150 / 332

4-26
CYLINDER AND PISTON
ENG
NOTE:
NOTE:
NOTE:
3. Measure:
Side clearance
Out of specification
Replace piston and
rings as a set.
Eliminate the carbon deposits from the piston ring
grooves and rings before measuring the side
clearance.
Side clearance:
Top ring:
0.035
X
0.070 mm
2nd ring:
0.035
X
0.070 mm
4. Position:
Piston ring
(into cylinder)
Push the ring with the piston crown so that the ring
will be at a right angle to the cylinder bore.
a
5 mm
5. Measure:
End gap
Out of specification
Replace.
You cannot measure the end gap on the expander
spacer of the oil control ring. If the oil control ring
rails show excessive gap, replace all three rings.
End gap:
Top ring:
0.30
X
0.45 mm
2nd ring:
0.30
X
0.45 mm
Oil ring:
0.20
X
0.70 mm