18 ENGINE
232
D04507-11
– Position the stop plate.
–
Mount screw
bk
but do not tighten yet.
–
Mount screw
bl
with the washer but do not tighten yet.
Info
The screws are tightened when the Z dimension is
adjusted.
18.5.12 Cylinder - Nikasil
®
coating
D04518-10
Nikasil
®
is a surface protection layer for a coating procedure devel-
oped 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.
18.5.13 Checking/measuring the piston
D04518-10
– Check the piston bearing surface for damage.
» If the piston bearing surface is damaged:
– Replace the piston and, if necessary, the cylinder.
– Check that the piston rings move easily in the piston ring
grooves.
» If the piston ring is stiff:
– Clean the piston ring groove.
Tip
An old piston ring can be used to clean the pis-
ton ring groove.
– Check the piston rings for damage.
» If the piston ring is damaged:
– Change the piston ring.
Info
Mount the piston ring with the marking facing
upward.
– Check the piston pins for discoloration or signs of wear.
» If the piston pin shows severe discoloration/signs of wear:
– Change the piston pin.
– Place the upper conrod bearing and piston pin in the connect-
ing rod and check the seating for play.
» If the piston pin seating has excessive play:
– Change the connecting rod, conrod bearing, and crank
pin.
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