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16
ENGINE
16.4.39 Checking the cylinder head (200 Duke)
16.4.40 Checking/measuring the cylinder (200 Duke)
–
Pretension the valve spring using the special tool.
Valve spring compressor (59029019000) (
Insert for valve spring lever (90129060000) (
–
Mount valve keys. Relax the valve spring.
Info
When mounting the valve keys, check that they are seated correctly; prefer-
ably, fix the valve keys to the valve with a little grease.
304552-10
–
Place shims into the valve spring retainers according to the installation position.
–
Check valve guides
Limit plug gauge (90129026000) (
»
If the special tool is easy to insert into the valve guide:
–
Change the valve guides and valves.
–
Check the sealing area of the spark plug thread and the valve seats for damage and
tearing.
»
If there is wear or tearing:
–
Change the cylinder head.
304520-10
–
Check the sealing area of the cylinder for distortion using a straight edge and the
special tool.
Feeler gauge (59029041100) (
Cylinder/cylinder head - distortion of
sealing area
»
If the measured value does not equal the specified value:
–
Change the cylinder head.
304521-10
–
Check sealing seat
Valve - sealing seat width
Intake
Valve - sealing seat width
Exhaust
»
If the measured value does not equal the specified value:
302808-10
–
Machine the valve seat.
–
Blow compressed air through all oil holes and check that they are clear.
–
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.
Guideline
Cylinder - bore diameter
304540-10
with the special tool.
1
p. 277)
p. 273)
≤ 0.10 mm (≤ 0.0039 in)
of the valves.
A
0.90... 1.10 mm (0.0354...
0.0433 in)
0.90... 1.10 mm (0.0354...
0.0433 in)
72.016... 72.027 mm (2.83527...
2.8357 in)
p. 272)
p. 279)
and
axes using a
X
Y
163
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