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

15-26

WARNING!

Fuel system is under pressure. Before
opening the system, place a cloth around the
connection. Then release pressure by
carefully loosening the connection.

- Disconnect fuel supply line and fuel return line -1- and -2-, and move
fuel lines clear.
- Pull hose off EVAP valve -3-.

- Unplug connector -1- from air mass meter.
- Unplug connectors -2- from ignition output stages, and move wiring
clear.
- Remove air cleaner.
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15-60


WARNING!
Fuel system is under pressure. Before opening the system, place a
cloth around the connection. Then release pressure by carefully
loosening the connection. - Pull off hose -1-.

- Disconnect fuel supply line and fuel return line -1- and -2-, and move
fuel lines clear.
- Pull hose off EVAP valve -3-.
Pa
ge 60 of 99 Valve
gear, servicin
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11/21/2002 htt
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15-66

Camshaft adjustment, checking function


Special tools and equipment

Test requirement:
WARNING!
VAS 5051 with VAG 5051/1
orVAG 1551 with VAG 1551/3ACoolant Temperature at least 80 C. During a road test in an airbag-equipped vehicle, test equipment
must always be fastened to and operated from the rear seat by a
second technician. When driving or riding in an airbag-equipped vehicle, NEVER hold
the scan tool or other test equipment in your hands or lap while in
motion. Objects between you and the airbag increase the risk of
injury in an accident.
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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
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15-94


Reworking valves
Valves must not be reworked. Only grinding-in (lapping) is permitted.
WARNING!
Note precautions required when disposing of sodium-cooled
exhaust valves Page 15
-87
. - To prevent damage to new valve stem seals, place plastic sleeve -A-
on valve stem.
- Lightly lubricate sealing lip with oil.
- Insert valve stem seal -B- (without oiling outside of seal) into installing
tool 3365 and carefully push it down onto valve guide.
- When installing new valves, lightly oil valve stems before installing.
Pa
ge 95 of 99 Valve
gear, servicin
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11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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yp
e=re
pair&id=AUDI.B5.GE05.15.1