warning AUDI A4 1997 B5 / 1.G AFC Engine Lock Carrier Removing For Service Workshop Manual

15-27

Intake and exhaust valves, checking and
refacing


Checking

- Inspect visually for scoring on valve stem and
valve seat surfaces. If clear signs of wear are
present replace valves.

Refacing intake valve
Refacing exhaust valves
WARNING! - 45a - max 3.5 mm (0.138 in.)
b - min. 0.5 mm (0.020 in.)
Valves must not be refaced by cutting or grinding. Only lapping is permitted.
Pa
ge 29 of 35 Lock carrier, removin
g for service
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE01.15.4

15-28

WARNING!

Worn sodium-filled exhaust valves must not
be scrapped without properly disposing of
the sodium.

The valves must be cut into two parts with a
hacksaw between the center of the valve
stem and the valve head. They must not
come into contact with water when being cut
open.

After cutting the valves:
Throw the valves, not more than ten at a
time, into a bucket filled with water and
STAND BACK. A sudden chemical reaction
occurs as the sodium comes into contact
with the water.
Valves that have been processed in this way
can then be disposed of in the normal waste.
Pa
ge 30 of 35 Lock carrier, removin
g for service
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE01.15.4