Skoda Octavia 1996 Service Manual page 74

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Cylinder Head/Valve Gear
Calculating maximum permissible reworking
dimension
- Insert valve and press firmly against the valve
seat.
Note:
If the valve is replaced when carrying out repairs,
use a new valve for the measurement.
K - Measure distance -a- between end of valve
stem and top edge of cylinder head.
- Calculate maximum permissible reworking
dimension from the distance -a- measured
and the minimum dimension.
Minimum dimensions:
Inlet valve 33.8 mm
Exhaust valve 34.1 mm
Distance -a- measured less minimum dimension
= max. permissible reworking dimension.
Example:
Distance measured
- Minimum dimension
= Max. permissible reworking dimension
Note:
If the max. permissible reworking dimension
obtained is 0 mm, repeat measurement with a
new valve. If the max. permissible reworking
dimension obtained is still 0 mm, replace cylinder
head.
K Reworking valve seats
Dimen-
sion
Ø a mm
b mm
c mm
Z
45°
30°
Valve seats
Valve seat 39.2 -0.1 - inlet valve
diameter 32.4 -0.1 - exhaust valve
max. permissible reworking dimension
Valve seat 1.9 ... 2.1 - inlet valve
width 2.3 ... 2.5 - exhaust valve
Bottom edge of cylinder head
Valve seat angle
Top correction angle
OCTAVIA
34.5 mm
33.8 mm
0.7 mm
Edition 05.97
S00.5105.51.20