A3 Mk1
Servicing valve gear
Reworking valve seats
Note: If a good seating pattern cannot be obtained by grinding the valve seats (lapping), they must be refaced (reworked): Special tools and workshop equipment required
Notes:
Calculating maximum permissible reworking dimension
Note: If the valve is to be renewed as part of a repair, use a new valve for the calculation. |
Measured distance minus minimum dimension
Note: If the maximum permissible reworking dimension is 0 mm or less than 0 mm, repeat the measurement with a new valve. If the measured result is again 0 mm or less than 0 mm, renew the cylinder head. |