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30/ENGINE - WORK ON THE INDIVIDUAL PARTS
®
Cylinder - Nikasil
coating
20.12
Checking/measuring the cylinder
20.13
Checking/measuring the piston
20.14
A
0 0 A
A
0 0 A
®
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
resulting in much improved performance, low wear, and a lightweight cylinder.
302699-10
–
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
micrometer to identify oval wear.
Guideline
Cylinder - drill hole diameter
Size I
302700-10
Size II
Info
The cylinder size
–
Using a straightedge and the special tool, check the sealing area of the cylinder
head for distortion.
Feeler gauge (59029041100) (
Cylinder/cylinder head - distortion of
sealing area
»
If the measured value does not meet specifications:
–
Change the cylinder.
305004-10
–
Use the special tool to measure clearance
groove.
Guideline
Piston ring - groove clearance
Feeler gauge (59029041100) (
»
If play
A
–
Change the piston and piston rings.
–
Check/measure the cylinder. (
400995-10
–
Check the piston sliding surface for damage.
»
If the piston sliding 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.
305017-10
®
is marked on the cylinder collar.
1
p. 274)
p. 274)
is larger than the specified value:
p. 139)
Tip
An old piston ring can be used to clean the piston ring groove.
coating are very good heat conductivity,
‑ and
‑axes using a
X
Y
88.000... 88.012 mm (3.46456...
3.46503 in)
88.012... 88.025 mm (3.46503...
3.46554 in)
≤ 0.10 mm (≤ 0.0039 in)
of the piston rings in the piston ring
A
≤ 0.08 mm (≤ 0.0031 in)
139
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