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16
ENGINE
16.4.11 Cylinder - Nikasil ® coating
16.4.12 Checking/measuring the cylinder
»
If the measured value does not equal the specified value:
–
Remove the crankshaft.
–
Remove the crankshaft bearing inner ring. (
–
Calculate the thickness of the compensation shims.
–
Add or remove compensation shims equally on both sides.
–
Install the crankshaft bearing inner ring. (
–
Mount the dial gauge support on the engine case and measure and note the axial
clearance of the balancer shaft.
Guideline
Balancer shaft axial clearance
»
If the measured value does not equal the specified value:
–
Remove the balancer shaft.
–
Calculate the thickness of the compensation shims.
–
Add compensation shims to the ignition side only.
300164-10
Nikasil
®
is a surface protection layer for a coating method developed by the Mahle
company. The name is derived from the two materials used in this method - a layer of
nickel, in which silicon carbide (a particularly hard substance) is embedded.
The most important advantages of the Nikasil
tivity resulting in better performance, less wear, and low cylinder weight.
305656-10
–
Check the O-ring of the chain adjuster for damage and wear.
»
If there is damage or wear:
–
Change the O-ring.
–
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 places in the
micrometer to check for oval wear.
305591-10
–
To determine the size, measure the cylinder at a distance
the cylinder.
Guideline
Distance
Cylinder - bore diameter
Size I
Size II
Info
If the axial clearance is too small, remove compensation shims.
If the axial clearance is too large, add compensation shims.
Info
If the axial clearance is too small, remove compensation shims.
If the axial clearance is too large, add compensation shims.
p. 128)
p. 131)
0.05... 0.20 mm (0.002... 0.0079 in)
®
coating are the excellent heat conduc-
and
axes using a
from the top edge of
55 mm (2.17 in)
102.000... 102.012 mm (4.01574...
4.01621 in)
102.013... 102.025 mm (4.01625...
4.01672 in)
132
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