18
ENGINE
161
18.4.13
Checking
crankshaft
run-out
at
bearing
pin
18.4.14
Cylinder.
Nlkasli
CiD
coating
304609-10
18.4.15
Checkinlfmeasurinll
the
cylinder
304689-10
30469&-10
- Position the crankshaft
on
a roller block.
- Turn the crankshaft slowly.
- Check the crankshaft run·out
on
both bearing pins.
I Crankshaft· run·out
on
bearing pin I
,;
0.16
mm
(,;
0.0063
in)
•
If
the crankshaft run·out at the bearing pin is larger than the specification,
- Align the crankshaft.
Nikasil
e
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
Nikasil
e
coating
are
very
good
heat conductivity,
resulting in much improved performance, low
wear,
and a lightweight cylinder.
- Check the cylinder bearing surface for damage.
•
If
the cylinder bearing surface is damaged,
- Change the cylinder and piston.
Measure the cylinder diameter at several locations
on
the - and ·axes using a
micrometer to identify oval wear.
Guideline
Cylinder·
drill hole diameter
Size I
95
...
95.012
mm
(3.74
...
3.74062
in)
Size II
95.013
...
95.025
mm
(3.74066
...
3.74113
in)
- The cylinder size is labeled
on
the side
of
the cylinder.
- Using a straightedge and the special tool, check the sealing area of the cylinder
head
for distortion.
I Feeler gauge
(59029041100)
(
..
p.
297)
Cylinder/cylinder
head·
sealing
area
distortion
,; 0.1
mm
(,;
0.004
in)
•
If
the measured value does not meet specifications,
- Change the cylinder.
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