Measured distance minus minimum dimension = maximum permissible refacing dimension.
Refacing valve seats
Fig. 226: Refacing Valve Seats Dimension
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Outer intake valves
Center intake valves
Exhaust valves
31.0 mm
32.2 mm
31.9 mm
Example for outer intake valve:
Measured distance
31.4 mm
-
Minimum dimension
- 31.0 mm
=
Max. permissible refacing dimension
= 0.4 mm
NOTE:
If the max. permissible refacing dimension is 0 mm or less than 0 mm,
repeat the measurement with new valve. If the measured result is again 0
mm or less than 0 mm, replace the cylinder head.
Dimension
Intake valve seat
dia. a
mm
26.2
b
mm
1.5...1.8
Z
Cylinder head, bottom edge
a
45 °
Valve seat angle
ß
30 °
Adjustment angle (top)
gamma
60 °
Adjustment angle (bottom)
Dimension
Exhaust valve seat
dia. a
mm
29.0
b
mm
1.8
Z
Cylinder head, bottom edge
2005 Audi A4 Quattro
ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
1:01:07 AM
Page 152
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