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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 160 (3.0L - Cylinder Head, VALVETRAIN - Engine Code(S): CCBA (Cabriolet)) >> 15 Cylinder Head, VALVETRAIN >> Specifications >> Valve Dimensions

Valve Dimensions

WARNING: This page is about a different car, the 2012 Audi S5, 2011 Audi S5, and 2010 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Intake and exhaust valves must not be refaced by grinding. Only lapping 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 the valves, throw no 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.
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