1997 AUDI A4 sensor

15-22


- Disconnect vacuum line at throttle body and line between vacuum
booster and intake air elbow (arrows).
- Remove intake air elbow.
- Remove intake manifold.
- Disconnect heated oxygen sensor harness connector at left-side of
heater core and set aside.

- Remove left-rear toothed belt guard (arrows).
- Unbolt coolant hose at rear of cylinder head.
Pa
ge 26 of 62 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.GE03.15.1

15-26

Tightening torques

Component
Tightening
torque
Bolts M6 10 Nm (7 ft lb)
Bolts M8 20 Nm (15 ft lb)
Camshaft bearing cap and
camshaft adjuster 10 Nm (7 ft lb)
Exhaust manifold to cylinder
head 25 Nm (18 ft lb)
Front exhaust pipe to exhaust
manifold 25 Nm (18 ft lb)
Heated Oxygen Sensor
(HO2S) 50 Nm (37 ft lb)
Spark plugs 25 Nm (18 ft lb)
Toothed belt sprocket to
camshaft 55 Nm (41 ft lb)
Intake manifold to cylinder
head 10 Nm (7 ft lb)
Cylinder head cover 10 Nm (7 ft lb)
Pa
ge 31 of 62 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.GE03.15.1

15-32

Right-side cylinder head

- Remove intake air duct between Mass Air Flow (MAF) sensor and
intake air elbow.
- Disconnect EVAP canister purge regulator valve and remove valve
from retainer.
- Disconnect harness connector for mass air flow sensor.

- Turn connection pipe for secondary air injection pump on air cleaner
45 in clockwise direction and pull forward off air cleaner. - Unbolt air cleaner and remove.
Pa
ge 38 of 62 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.GE03.15.1

15-33

All models

- Remove Camshaft Position (CMP) sensor
housing and shutter wheel.

- Unbolt shutter wheel for Camshaft Position
(CMP) sensor -G40- and carefully pry out using
screwdriver.

Tightening torque: 20Nm (15 ft lb)

- Remove cylinder head cover.

- Install 3391 camshaft locator bar into camshaft
locking plates.

- Loosen both bolts for camshafts and back out
bolts approx. 5 turns.

- Remove 3391 camshaft locator bar.

- Remove both camshaft sprockets using T40001 special tool.
- Using screwdriver, carefully lift out oil lines for camshaft bearing
lubrication from camshaft bearings.
When lifting out oil lines, be careful not to damage positioning clips.
Pa
ge 39 of 62 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.GE03.15.1

15-41

Tightening torques

Component

Tightening
torque
Bolts M6 10 Nm (7 ft
lb)

M8 20 Nm (15 ft
lb)
Except for the following:
Bearing cap to cylinder
head 10 Nm (7 ft
lb)
Camshaft adjuster to cylinder
head 10 Nm (7 ft
lb)
Shutter wheel for Camshaft
Position (CMP) sensor -G40- to
camshaft 25 Nm (18 ft
lb)
Housing for Camshaft Position
(CMP) sensor -G40- to cylinder
head 10 Nm (7 ft
lb)
Camshaft gear to
camshaft 55 Nm (41 ft
lb)
Camshaft bearing cap and
camshaft adjuster 10 Nm (7 ft
lb)
Cylinder head cover 10 Nm (7 ft
lb)
Pa
ge 47 of 62 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.GE03.15.1