17 ENGINE
17.4.12 Installing the drive gear wheel of the balancer shaft
310342-10
17.4.13 Cylinder- Nikasil
®
coating
310368-10
- Ensure that woodruff key
O
is seated properly.
- Warm drive gear wheel
8
of the balancer shaft and push it
onto the balancer shaft.
Guideline
1100 °C (212 °F)
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 better performance, low
wear, and a lightweight cylinder.
17.4.14 Checking/measuring the cylinder
310346-10
196
- Check the cylinder bearing surface for damage.
If the cylinder bearing surface is damaged:
- Change the cylinder and piston.
- Measure the bore 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
surface of the cylinder head for distortion.
I Feeler gauge (59029041100) (
0
p. 298)
Cylinder/cylinder head - dis- � 0.10 mm (� 0.0039 in)
tortion of sealing area
If the measured value does not meet specifications:
- Change the cylinder.