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Work procedure > < Reworking valve seats

Fabia Mk2

Calculating maximum permissible reworking dimension
Calculating maximum permissible reworking dimension
–  Insert valve and press firmly against the valve seat.
  Note
If the valves are replaced when carrying out repair work, use new valves for the measurement.
   
–  Measure distance between the valve stem end and the upper face of the cylinder head.
–  Calculate max. permissible reworking dimension from the distance measured and the minimum dimension.
  S15-0293
Minimum dimension: inlet valve7.6 mm
Minimum dimension: outlet valve7.6 mm

“Measured distance” - “minimum dimension” = “max. permissible reworking dimension”.
Example:
   
Measured distance8.0 mm
- Minimum dimension7.6 mm
= max. permissible reworking dimension → Note0.4 mm

1)  The max. permissible reworking dimension is shown in the figures for reworking the valve seats as dimension “b”.
   
Reworking inlet valve seat
a = Ø 28.7 mm
b = max. permissible reworking dimension
c = 1.5...1.8 mm
Z = Bottom edge of cylinder head
α = 45° valve seat angle
β = 30° top correction angle
γ = 60° bottom correction angle
  S15-0217
Reworking exhaust valve seat
a = Ø 25.0 mm
b = max. permissible reworking dimension
c = approx. 1.8 mm
Z = Bottom edge of cylinder head
α = 45° valve seat angle
β = 30° top correction angle
γ = 60° bottom correction angle
  S15-0217

Work procedure > < Reworking valve seats