Reworking Valve Seats - Skoda OCTAVIA MK1 Service Manual

soluble oil while doing this.
– Install new valves.
– Rework the valve seats

Reworking valve seats

Special tools and workshop equipment required
t Depth gauge/caliper gauge
t NAC milling cutter for reworking valve seats
t Grinding paste
Note
When carrying out repairs on engines with leaking valves, it is not sufficient to machine or
t replace the valve seats and valves. 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 obtain a proper contact pattern. Calculate
the maximum permissible reworking dimension before commencing. If the reworking
t
dimension is exceeded, the proper operation of the hydraulic valve clearance
compensation is no longer ensured. If this is the case replace the cylinder head.
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.
Measure distance -a- between the end of
–
the valve stem and the upper face of the
cylinder head.
Calculate max. permissible reworking
–
dimension from the distance -a-
measured and the minimum dimension.
Minimum dimension: Inlet valve .... 33.8
mm
Outlet valve .... 34.1 mm
Distance measured -a- minus minimum
dimension = max. permissible reworking
dimension.
Example:
→ Chapter.
81