Yamaha 2002 TDM900, Руководство по обслуживанию

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5-34
CYLINDER AND PISTONS
ENG
NOTE:
EA262
CHECKING THE CYLINDER AND PISTONS
The following procedure applies to all of the cyl-
inders and pistons.
1. Check:
S
piston wall
S
cylinder wall
Vertical scratches
!
Replace the cylinder,
and replace the piston and piston rings as a
set.
2. Measure:
S
piston-to-cylinder clearance
a. Measure cylinder bore “C” with the cylinder
bore gauge.
Measure cylinder bore “C” by taking side-to-
side and front-to-back measurements of the cyl-
inder. Then, find the average of the measure-
ments.
Cylinder bore “C” 92.00
X
92.01 mm
Taper limit “T” 0.05 mm
Out of round “R” 0.05 mm
“C” = maximum of D
1
X
D
6
“T” = maximum of D
1
or D
2
– maximum of
D
5
or D
6
“R” = maximum of D
1
, D
3
or D
5
– mini-
mum of D
2
, D
4
or D
6
b. If out of specification, replace the cylinder,
and the piston and piston rings as a set.
c. Measure piston skirt diameter “P” with the
micrometer.
a 5 mm from the bottom edge of the piston
Piston size “P”
Standard 91.960
X
91.975 mm
d. If out of specification, replace the piston and
piston rings as a set.
e. Calculate the piston-to-cylinder clearance
with the following formula.
Piston-to-cylinder clearance =
Cylinder bore “C” –
Piston skirt diameter “P”