KTM 690 Enduro R 2018, Repair Manual

Page: 168 / 311

17.4.13
Checking/measuring
the
piston
305604-10
305645-10
—_
t+
305603-10
Use the special tool
to
measure
play
®
of the piston rings in
the
piston ring
groove.
Guideline
Piston
ring
-
groove clear- <
0.08
mm
(s 0.0031 in)
ance
Feeler gauge
(59029041100) («=
p.
286)
»
If play
o
is
greater
than the
specified
value:
—
Change
the
piston
and
piston rings.
—
Check/measure the
cylinder.
(>
p.
165)
Check the
piston bearing
surface for
damage.
»
If the
piston bearing
surface is damaged:
—
Change the
piston
and, if necessary, the cylinder.
Check thatthe
piston rings
can move
easily
in the
piston ring
grooves.
»
If the
piston
ring
is
stiff:
—
Clean the
piston ring
groove.
e
Tip
ll
Use
an
old
piston
ring
to
clean the
piston
ring
groove.
Check the
piston rings for damage.
»
If the
piston ring
is
damaged:
—
Change
the
piston ring.
e
Info
Mount the
piston
ring with the marking
facing
upward.
Check the piston pin
for
discoloration
or
signs of
wear.
»
If the
piston pin
has strong discoloration/signs of
wear:
—
Change
the
piston pin.
Insert the
piston pin into the connecting
rod and check the
bearing for play.
»
If the
piston pin bearing
has too much
play:
-—
Change
the
connecting
rod and the
piston pin.
Measure the
piston
at the
piston skirt,
at
right angles
to the
piston pin,
at
a
distance
©.
Guideline
Distance
@
|
31.5
mm
(1.24 in)
Piston
-
diameter
Size | 101.955
...
101.965
mm
(4.01397
...
4.01436 in)
Size Il 101.965
...
101.975
mm
(4.01436
...
4.01476 in)
166