dimensions AUDI A4 1999 B5 / 1.G APB Engine Valve Gear Service Workshop Manual

15-87


Valve dimensions, checking

Note:
Valves must not be reworked. Only grinding-in (lapping) is permitted.
WARNING!
Worn sodium-cooled exhaust valves must be treated as follows
before disposal:
Dimension
Inlet valve
Exhaust valve
a = diameter mm 26.8 ... 27.0 29.8 ... 30.0
b = diameter mm 5.96 ... 5.97 5.94 ... 5.95
c = mm 104.84 ... 105.34 103.64 ... 104.14
=
45 45
Saw the valves into two sections with a metal saw at a point
between the center of the valve stem and the valve head. The
valves must not come into contact with water when this is done.
Then throw the valves into a bucket of water (not more than ten at
a time) and step back, because a chemical reaction occurs when
the sodium filling burns. After this treatment the valves can be
disposed of in the normal way.
Pa
ge 88 of 99 Valve
gear, servicin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE05.15.1

15-97

Minimum dimensions
Outer inlet
valve Center inlet
valve Exhaust
valve
32.2 mm 33.2 mm 33.0 mm
Measured distance minus minimum dimension =
maximum permissible reworking dimension.

Example
Center inlet valve
Measured distance 33.0 mm
Minimum dimension - 32.2
mm
Maximum permissible reworking
dimension = 0.8 mm

Note:
If the measured distance is less than the
minimum dimension, repeat the measurement
with new valves, or replace cylinder head.
Pa
ge 99 of 99 Valve
gear, servicin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE05.15.1