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19 ENGINE
19.4.11 Cylinder -
Nikasil®
coating
R034!5-
l0
19.4.12
Checking/measuring
the cylinder
292
Nikasilil>
is
a
surface
protection layer for
a coating
procedure
devel-
oped by Mahle. The
name
is
derived from
the
two
materials
used
in this
procedure
-
a layer
of
nickel
into
which
is embedded the
particularly hard
silicone carbide.
The most
important advantages
of
the
Nikasilil>
coating
are very
good heat
conductivity,
resulting
in much
improved
performance,
low wear,
and a l ightweight
cylinder.
-
Check
the
0-ring of the chain adjuster for damage and
wear.
»
If
there is damage
or
wear:
-
Change the 0
-ring.
-
Check the
cylinder
bearing
surface for
damage.
»
If
the
cylinder bearing surface is
damaged:
-
Change the
cyl
inder and piston.
-
Measure
the bore diameter
at several locations
on
the
0
-
and
0
-axes
using a micrometer
to
Identify
oval
wear.
Guideline
Cylinder
-
bore diameter
Size
1
88.000 ... 88.012 mm
(3.46456
... 3.46503
in)
-
Using
a straightedge and
t
he special
tool, check the
seali
ng
surface
of the
cylinder head
for
distortion.
I
Feeler
gauge
(59029041100)
(If
p.
47
1)
Cylinder/cyl inder head
- seal-
s 0.05 mm
(s
0.002
in)
ing area
distortion
If
the measured
value
does
not
meet specifications:
-
Change
engine
case.
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