audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Machining valve seats > < Renewing valve stem oil seals with cylinder head removed

A4 Mk3

Valve dimensions
Valve dimensions
  Note
   
Inlet and exhaust valves must not be machined. Only grinding-in is permitted.
  A15-0326
DimensionInlet valveExhaust valve
Ø amm28.5 … 28.725.9 … 26.1
Ø bmm5.968 … 5.9825.958 … 5.972
cmm97.2 … 97.499.0 … 99.2
α∠°45° 10'45° 10'

  WARNING
Care must be taken when disposing of old sodium-cooled exhaust valves - risk of injury.
t  The valves must be sawn in two with a metal saw between the centre of the stem and valve head. When doing so, the valves must not come into contact with water.
t  Then throw a maximum of ten valves into a bucket of water and step away immediately.
t  A sudden chemical reaction will occur upon contact with water in which the sodium filling burns.
t  After performing these steps the valves can be disposed of in the normal way.
   

Machining valve seats > < Renewing valve stem oil seals with cylinder head removed