Yamaha 2002 TDM900, Service Manual

Page: 285 / 475

5-36
CYLINDER AND PISTONS
ENG
NOTE:
NOTE:
NOTE:
EAS00264
CHECKING THE PISTON RINGS
1. Measure:
S
piston ring side clearance
Out of specification
!
Replace the piston
and piston rings as a set.
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
Piston ring side clearance
Top ring
0.03
X
0.07 mm
<Limit>: 0.12 mm
2nd ring
0.02
X
0.06 mm
<Limit>: 0.12 mm
2. Install:
S
piston ring
(into the cylinder)
Level the piston ring into the cylinder with the
piston crown.
a 5 mm
3. Measure:
S
piston ring end gap
Out of specification
!
Replace the piston
ring.
The oil ring expander spacer’s end gap cannot
be measured. If the oil ring rail’s gap is exces-
sive, replace all three piston rings.
Piston ring end gap
Top ring
0.02
X
0.35 mm
<Limit>: 0.6 mm
2nd ring
0.40
X
0.55 mm
<Limit>: 0.9 mm
Oil ring
0.20
X
0.50 mm