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Reworking valve seats with NAC milling cutter > < Calculating maximum permissible reworking dimension

Octavia Mk1

Reworking valve seats
   
Reworking valve seats
  S15-0114
Dimension Valve seats
Ø ammValve seat diameter26.2 - inlet valve
29.0 - outlet valve
bmmMax. permissible reworking dimension
cmmValve seat width1.5 to 1.8 - inlet valve
1.8 - outlet valve
Z Bottom edge of cylinder head
45° Valve seat angle
30° Top correction angle
60° Bottom correction angle

Procedure
Reworking can be carried out with a machine or by hand. The following conditions must be met:
l  Wear limit of valve guides must not exceed the permissible dimension → Chapter.
l  Use NAC milling cutter with carbide metal tips (min. 90 HRC).
   

Reworking valve seats with NAC milling cutter > < Calculating maximum permissible reworking dimension