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Home >> Audi >> 2016 >> S4 Premium Plus, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 567 (3.0L - Cylinder Head & VALVETRAIN - Engine Code(S): CTUC & CTUD) >> 15 Cylinder Head, VALVETRAIN >> Intake And Exhaust Valves >> Valve Dimensions

Valve Dimensions

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NOTE:

Intake and exhaust valves must not be reworked. Only grinding is permitted.

Fig 1: Identifying Valve Dimensions
GWWA15-0326Courtesy of AUDI OF AMERICA, LLC
Dimension Intake Valve Exhaust Valve
Diameter a mm 33.85 ± 0.10 28.0 ± 0.1
Diameter b mm 5.98 ± 0.01 5.96 ± 0.01
c mm 104.0 ± 0.2 101.9 ± 0.2
α ∠° 45 45
WARNING:
  • Worn sodium-filled exhaust valves must not be scrapped without first being properly treated.
  • Using a metal saw, the valves must be cut in half between the shaft center and valve plate. While doing this, do not come into contact with water. After cutting open valves, throw not more than 10 at a time into a bucket of water. Then, move quickly away, because a sudden chemical reaction will occur during which the sodium is burnt away.
  • The treated parts may then be discarded through conventional disposal channels.