1996 AUDI A4 AEB ATW Engines Valvetrain Servicing Workshop Manual

15-72

Determining maximum allowable refacing
dimension

- Insert valve and press tightly against valve
seat.

Note:
If valve is replaced during repair, use new valve
for measurement.

- Measure distance between end of valve stem
and camshaft center axis (camshaft center axis
is located at the level of cylinder head upper
edge).

- Determine maximum allowable refaced
dimension using distance measured and
minimum dimension.

Minimum dimensions
Outer intake
valves Center intake
valve Exhaust
valves
34.0 mm
(1.338 in.) 33.7 mm
(1.236 in.) 34.4 mm
(1.354 in.)
Pa
ge 49 of 51 Valvetrain, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.15.3

15-73
Distance measured minus minimum dimension =
maximum allowable refacing dimension.

Example for outer intake valve:
Distance measured 34.4 mm (1.354
in.)
- Minimum dimension - 34.0 mm (1.338
in.)
= maximum allowable
refacing dimension = 0.4 mm (0.016
in.)

Note:
If the maximum allowed refaced dimension is 0
mm or less than 0 mm, repeat measurement
using new valve. If measurement is still 0 mm or
less than 0 mm , replace cylinder head.
Pa
ge 50 of 51 Valvetrain, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.15.3

15-74


Valve seats, refacing Intake valve seat
Diameter -a- = 26.2 mm (1.031 in.)
Dimension -b- = 1.5-1.8 mm (0.059-0.070 in.)
Z = Cylinder head lower edge
Angle -a- =
45 valve seat angle Angle -b- =
30 upper correction angle Angle -g- =
60 lower correction angle Exhaust valve seat
Diameter -a- = 29.0 mm (1.142 in.)
Dimension -b- = approx. 1.8 mm (0.070 in.)
Z = Cylinder head lower edge
Angle -a- =
45 valve seat angle Angle -b- =
30 upper correction angle Angle -g- =
60 lower correction angle
Pa
ge 51 of 51 Valvetrain, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.15.3