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18 ENGINE
18.4.14 Checking/measuring the cylinder
305004-10
- 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
0-
and
0-axes
using a micrometer to identify oval
wear.
Guideline
Cylinder - drill hole diameter
Size I
78.000 ... 78.012 mm
(3.07086 ... 3.07133 in)
Size II
78.012 ... 78.025 mm
(3.07133 ... 3.07184 in)
Info
The cylinder size
O
is marked on the cylinder collar.
- Using a straightedge and the special tool, check the sealing
area of the cylinder head for distortion.
I Feeler gauge (59029041100) (
a
p. 322)
Cylinder/cylinder head - dis- :5 0.10 mm (:5 0.0039 in)
tortion of sealing area
If the measured value does not meet specifications:
- Change the cylinder.
18.4.15 Checking/measuring the piston
188
e-'
+
400995-10
308788-10
- Use the special tool to measure clearance
t)
of the piston
rings in the piston ring groove.
Guideline
Piston ring - groove clear
ance
:5 0.08 mm (:5 0.0031 in)
I Feeler gauge (59029041100) (
�
p. 322)
If play
t)
is larger than the specified value:
- Change the piston and piston rings.
- Check/measure the cylinder. (
�
p. 188)
- 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.
Содержание F2103P4
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