17 ENGINE
17 .4.12 Installing the drive wheel of the balancer shaft
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17.4.13 Cylinder - Nikasil
®
coating
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- Ensure that woodruff key
O
is seated properly.
- Warm drive wheel
8
of the balancer shaft and push it onto
the balancer shaft.
Guideline
1100 °C (212 °F)
41
Nikasil
®
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
®
coating are very
good heat conductivity, resulting in much improved performance,
low wear, and a lightweight cylinder.
17.4.14 Checking/measuring the cylinder
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192
- 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 0- and 0-axes using a micrometer to identify oval
wear.
Guideline
Cylinder - drill hole diameter
Size I
78.000 ... 78.012 mm
(3.07086 ... 3.07133 in)
Size II
78.012 ... 78.025 mm
(3.07133 ... 3.07184 in)
Info
The cylinder size
O
is marked on the cylinder collar.
- Using a straightedge and the special tool, check the sealing
area of the cylinder head for distortion.
I Feeler gauge (59029041100) (
a
p. 288)
Cylinder/cylinder head -
distortion of sealing area
:e; 0.10 mm (:e; 0.0039 in)
If the measured value does not meet specifications:
- Change the cylinder.
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