16 ENGINE 132
» If the measured value does not equal the specified value:
– Remove the crankshaft.
– Remove the crankshaft bearing inner ring. ( p. 128)
– Calculate the thickness of the compensation shims.
– Add or remove compensation shims equally on both sides.
Info
If the axial clearance is too small, remove compensation shims.
If the axial clearance is too large, add compensation shims.
– Install the crankshaft bearing inner ring. ( p. 131)
300164-10
– 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 0.05… 0.20 mm (0.002… 0.0079 in)
» 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.
Info
If the axial clearance is too small, remove compensation shims.
If the axial clearance is too large, add compensation shims.
16.4.11 Cylinder - Nikasil
®
coating
305656-10
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
®
coating are the excellent heat conduc-
tivity resulting in better performance, less wear, and low cylinder weight.
16.4.12 Checking/measuring the cylinder
305591-10
– 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
and
axes using a
micrometer to check for oval wear.
–
To determine the size, measure the cylinder at a distance
from the top edge of
the cylinder.
Guideline
Distance
55 mm (2.17 in)
Cylinder - bore diameter
Size I 102.000… 102.012 mm (4.01574…
4.01621 in)
Size II 102.013… 102.025 mm (4.01625…
4.01672 in)
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