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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