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18
ENGINE
18.4.14 Cylinder
-
Nikasil® coating
3
10060-10
18.4.15 Checking/measuring the cylinder
3
10061-10
»
If
the measured
va
lue
does
not
meet specifications:
Remove
the crankshaft.
Remove
the
crankshaft bearing
inner
race.
(i!ll
p.
187
)
Calcu
late the thickness of the
compensating
disks.
Add or
remove compensati
ng
disks equally
on both
si
des.
•
Info
I
If
the
end play is
t
oo
small
,
remove
compensating
disks.
If the
end play is
t
oo large,
add compensating
disks.
Install
the crankshaft bearing inner
race.
(i!ll
p.
187)
190
NikasiJ®
is
a
surface
protection
layer for
a coating procedure developed 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
NikasiJ«> coating
are
very
good heat
conductivity,
resu lting in much
improved
performance,
low
wear,
and a lightweight cylinder.
(All 450 models)
Check the
cylinder
bearing
surface
for damage.
»
If
the
cyl
inder bearing surface is damaged:
Change
the
cyl
inder and piston.
Measure
the
cylinder
diameter
at
several
locations
on
the
0-
and 0-axes
using
a
micrometer
t
o
identify oval wear.
Guideline
Cylinder
-
drill hole
diameter
Size
I
95.000
...
95.012 mm (3.74015
...
3.74062
in)
Size
II
95.013
...
95.025
mm
(3.74066
...
3 .74113 in)
The cylinder size
0
is marked
on the
side
of the
cylinder.
Using
a
straightedge
and
the
special t
ool,
check
the sealing surface
of the
cyl
inder head
for distortion.
I
Feeler gauge
(59029041100)
(i!ll
p. 364)
Cylinder/cyli
nder
head
-
sealing
area
distortion
s 0.10
mm
(s 0.0039
in)
»
If
the measured value does not
meet
specifications:
Change
the
cyl
inder.
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