Reworking Valve Seats - Skoda Octavia 1996 Service Manual

OCTAVIA
Edition 05.97
S00.5105.51.20
Cylinder Head/Valve Gear
Installing
- Moisten new guides with oil and press into
the cold cylinder head from the camshaft side
as far as the collar with MP 1-205.
Note:
After the guide makes contact with the collar,
do not increase the insertion force to more than
10 kN otherwise the collar may shear off.
- Use hand reamer MP 1-204 to widen valve
guides. It is essential to use diluted soluble
oil for this step.
- Install new valves.
- Rework valve seats ⇒ page 15-23.

Reworking valve seats

Special tools, testers and aids required
♦ Depth gauge/sliding caliper
♦ NAC milling cutter for reworking valve seats
♦ Grinding paste
Notes:
♦ When repairing engines with leaking valves,
it is not sufficient to rework the valve seats
and valves or to replace them. It is also
necessary to inspect the valve guides for
wear, particularly on engines with a high
mileage.
♦ Rework valve seats only sufficiently in order
to achieve a proper contact pattern. Calculate
the maximum permissible reworking dimen-
sion before commencing reworking. If the
reworking dimension is exceeded, proper
operation of the hydraulic valve clearance
compensation elements is no longer assured
and the cylinder head should be replaced.
15
¡ ¢ £ ¤
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