KTM 690 Enduro R 2018, Repair Manual

Page: 169 / 311

17.4.14
Checking
the
piston ring
end gap
ie
305590-10
e
Info
Piston size
eo
is marked
on
the
piston
head.
Removethe
piston ring
from the
piston.
Place the
piston
ring in
the
cylinder
and
align with the piston.
Guideline
Below the
upper
edge of the
|
10
mm
(0.39in)
cylinder
Measure end gap
o
with
a
feeler gauge.
Guideline
Piston
ring
end gap
<=
0.80
mm
(s 0.0315 in)
=
1.00
mm
(s 0.0394 in)
Compression rings
Oil scraper
ring
»
If the end gap
is
greater than the
specified
measurement:
—
Check/measure the
cylinder.
(>
p.
165)
»
If
cylinder
wear
lies within the
specified
tolerance:
-
Change
the
pistonring.
Mount the
piston
ring
with
the
marking facing
toward the
pis-
ton
head.
17.4.15
Determining
the
piston/cylindermounting
clearance
305645-10
Check/measure
the
cylinder. (~
p.
165)
Check/measure
the
piston.
(—"
p.
166)
The smallest
piston/cylindermounting
clearance is the result
of the smallest
cylinder
bore diameter minus the
largest piston
diameter. The
largest piston/cylindermounting
clearance is the
result of the largest cylinder bore diameter minus the
smallest
piston
diameter.
Guideline
Piston/cylinder
-
mounting
clearance
17.4.16
Checking
oil
pumps for
wear
0.035
...
0.060
mm
(0.00138
...
0.00236 in)
0.10
mm
(0.0039 in)
New condition
Wearlimit
e
Info
The oil pump
wear
check shown here is
on
the suction pump
but
it
applies
to
all oil pumps.
167