Contents Wiring diagrams Section: Mechanical All sections

Checking Audi A8 D3

Mechanical 1 illustration
CAUTIONBecause of the difference in stem diameters, make sure that only an intake valve is used to check intake valve guides and that only an exhaust valve is used to check exhaust valve guides.

Scheme 169

Scheme 169
  1. Install valve in valve guide so that end of valve stem is flush with end of guide.
  2. Measure amount of rock (axial play).
Intake valve guideExhaust valve guide
0.8 mm (0.031 in.)0.8 mm (0.031 in.)

VALVE ROCK (AXIAL PLAY) WEAR LIMIT

Note. If the wear limit is exceeded, repeat measurement with new valves. If the measurement is again exceeded, replace cylinder head. Valve guides cannot be replaced. If you intend to replace the valve, measure with new valve.