17 ENGINE
17.4.14 Cylinder - Nikasil
®
coating
310060-10
If the measured value does not meet specifications:
-
Remove the crankshaft.
-
Remove the crankshaft bearing inner race. (
0
p. 192)
-
Calculate the thickness of the compensating disks.
- Add or remove compensating disks equally on both
sides.
Info
If the end play is too small, remove compen
sating disks.
If the end play is too large, add compensating
disks.
-
Install the crankshaft bearing inner race. (
a
p. 193)
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.
17.4.15 Checking/measuring the cylinder
310059-10
196
-
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
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
O
is labeled on the side of the cylinder.