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Grinding in valves > < Procedure

Octavia Mk1

Reworking valve seats with NAC milling cutter
   
Reworking valve seats with NAC milling cutter
–  Place cylinder head on a felt base and secure to prevent it from turning.
–  Match diameter of guide drift to diameter of valve guide.
  S15-0098
Valve guideGuide drift Ø mm
Inlet valve7,0 -0,01
Exhaust valve

–  Match diameter of milling cutter to diameter of valve.
   
Valve seatØ Milling cutter 90°
mm		Ø Milling cutter 150°
mm		Ø Milling cutter 60°
mm
Inlet valve Ø 36 mm363721/34
Outlet valve Ø 31.5 mm3233 

Reworking inlet valve seat
–  Mill valve seat with 90° milling cutter until a perfect contact pattern is achieved. (Do not exceed maximum permissible reworking dimension!)
–  Chamfer bottom correction angle with 60° milling cutter until the valve seat diameter -a- → Chapter is achieved.
–  Mill bottom correction angle with 150° milling cutter until valve seat width -c- is achieved → Chapter.
Reworking exhaust valve seat
–  Mill valve seat with 90° milling cutter until a perfect contact pattern is achieved. (Do not exceed maximum permissible reworking dimension!)
–  Measure achieved seat width with caliper gauge:
Specified value: 2.0 mm
If the measured dimension is less than the nominal value:
–  Chamfer valve seat with 90° milling cutter until valve seat width -c- is achieved → Chapter. (Do not exceed maximum permissible reworking dimension!)
If the measured dimension is more than the nominal value:
–  Mill bottom correction angle with 150° milling cutter until valve seat width -c- is achieved → Chapter.
   

Grinding in valves > < Procedure