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Reworking valve seats with NAC milling cutter > < Reworking inlet valve seat

Fabia Mk1

Reworking exhaust valve seat
   
Reworking exhaust valve seat
For engine with identification characters AWY, BMD
  S15-0340
Dimension Exhaust valve seat
Ø amm27,1
bmmmax. permissible reworking dimension
cmm1,6...1,8
Z Bottom edge of cylinder head
α 45° valve seat angle
β 30° top correction angle
γ 60° bottom correction angle
S Combustion chamber surface area

For engine with identification characters AZQ, BME
   
Dimension Exhaust valve seat
Ø amm25,0
bmmmax. permissible reworking dimension
cmmapprox. 1.8
Z Bottom edge of cylinder head
α 45° valve seat angle
β 30° top correction angle
γ 60° bottom correction angle
S Combustion chamber surface area

Work procedure
Reworking can be carried out by hand while complying with the following conditions:
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).
l  Mill with the milling cutter using slight pressure in such a way that an even removal of swarfs is ensured over the whole working surface.
   

Reworking valve seats with NAC milling cutter > < Reworking inlet valve seat