Checking The Piston Rings - Yamaha 2002 TDM900 Service Manual

CYLINDER AND PISTONS
EAS00264

CHECKING THE PISTON RINGS

1. Measure:
S piston ring side clearance
Out of specification ! Replace the piston
and piston rings as a set.
NOTE:
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
Piston ring side clearance
2. Install:
S piston ring
(into the cylinder)
NOTE:
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.
NOTE:
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
5-36
ENG
Top ring
0.03 X 0.07 mm
<Limit>: 0.12 mm
2nd ring
0.02 X 0.06 mm
<Limit>: 0.12 mm
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