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Engine lubrication > < Reworking valve seats

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 valve6,0 -0,01
Exhaust valve

–  Match diameter of milling cutter to diameter of valve seat.
   
Valve seatMilling cutter Ø mm
90°120°60°
Inlet valve282830
Exhaust valve323232

   
Milling sequence
 - 1. Mill valve seat with 90° milling cutter until a perfect contact pattern is achieved. (Do not exceed maximum permissible reworking dimension!)
 - 2. Chamfer top correction angle with 120° milling cutter until the valve seat diameter -a- ( → Chapter) is achieved.
 - 3. Mill bottom correction angle with 60° milling cutter until valve seat width -c- ( → Chapter) is achieved.
  S15-0115
–  Grind in valve/valve seat -arrows- with fine grinding paste so as to achieve a perfect contact pattern.
–  Inspect valve for leaks.
The inspection can be carried out with water colour (perfect contact pattern over entire circumference) or by filling fuel into the combustion chamber (no fuel must flow out at the valve seat).
  Note
After installing the cylinder head, check the hydraulic bucket tappets → Chapter.
  S15-0061

Engine lubrication > < Reworking valve seats