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Machining valve seats > < Valve dimensions

A3 Mk1

Checking valve guides
Checking valve guides
Special tools and workshop equipment required
   
t  Universal dial gauge bracket -VW 387-
  W00-0037
t  Dial gauge -VAS 6079-
  W00-1261
Procedure
–  Insert valve into valve guide.
l  End of valve stem must be flush with valve guide.
  Note
Only insert inlet valve into inlet guide and exhaust valve into exhaust guide, as the stem diameters are different.
–  Determine amount of sideways play:
l  Wear limit for inlet and exhaust valve guide: 0.8 mm.
  Note
t  If the wear limit is exceeded, repeat the measurement with new valves. Renew cylinder head if wear limit is still exceeded.
t  If the valve has to be renewed as part of a repair, use a new valve for the measurement.
  V15-0133

Machining valve seats > < Valve dimensions