Reworking Valve Seats - Skoda Octavia Workshop Manual

OCTAVIA
Edition 04.03
S00.5127.54.20
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 repair
work, use a new valve for the measurement.
K - Measure distance -a- between the valve
stem end and the upper face of the cylinder
head.
- Calculate max. permissible reworking dimen-
sion from the distance -a- and measure the
minimum dimension.
Minimum dimension:
Inlet valve 33.8 mm
Outlet valve 34.1 mm
Minimum dimensions less distance measured
= max. permissible reworking.
Example:
Minimum dimension
- distance measured
= max. permissible reworking dimension 0.7 mm
Note:
If the max. permissible reworking dimension is
0 mm, repeat measurement with a new valve.
If the max. permissible reworking dimension is
again 0 mm, replace cylinder head
K Reworking valve seats
Dimen-
sion
∅ a mm Valve seat
b mm
c mm Valve seat
Z
45°
30°
Valve seats
39.2 - 0.1 - Inlet valve
diameter 32.4 - 0.1 - Outlet valve
max. permissible reworking dimension
1.9….2.1- Inlet valve
width 2.3….2.5 - Outlet valve
Bottom edge of cylinder head
Valve seat angle
Top correction angle
15
33.1 mm
33.8 mm
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