coolant AUDI TT 1996 8N / 1.G AEB ATW Engines Turbocharger System Workshop Manual

21-26


13 -
Gasket
Always replaceNote installed position
14 -
Coolant return line Union nut tightening torque: 30 Nm (22 ft
lb)
15 -
Nut Always replace25 Nm (18 ft lb)
16 -
Gasket Always replaceNote installed position
17 -
Banjo bolt 25 Nm (18 ft lb)
18 -
Coolant supply line
19 -
Fuse
20 -
Vacuum diaphragm For wastegate
21 -
Bolt 10 Nm (7 ft lb)
Pa
ge 34 of 50 Turbochar
ger s
ystem
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.1

21-30

Turbocharger, removing and installing


Note:
Replace gaskets and self-locking nuts.

Removing

WARNING!
Do NOT open A/C refrigerant circuit. - Remove noise insulation panel (arrows).
- Unbolt A/C compressor.

- Unbolt turbocharger bracket -2-.
- Disconnect oil return line -1- at turbocharger and lay aside.
- Remove air guide ducts -4- and -5- at turbocharger.
- Remove pressure line banjo fitting -3-.
- Disconnect hose from support for charge air pressure regulation valve
vacuum diaphragm.
- Unbolt bracket for coolant supply line at charge air pressure regulation
valve vacuum diaphragm.
Pa
ge 39 of 50 Turbochar
ger s
ystem
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.1

- Use 3094 hose clamp to pinch off coolant supply hose.
Pa
ge 40 of 50 Turbochar
ger s
ystem
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.1

21-31

- Remove intake air duct between cowl and air
cleaner housing.

- Remove air cleaner housing cover.

- Remove the following lines/harness connectors:
1 - At wastegate bypass regulator valve -N75-
2 - At Evaporative Emissions (EVAP) purge regulator valve -N80-
3 - At power output stage -N122-
4 - At Mass Air Flow (MAF) sensor -G70-
- Remove hose connections and remove air cleaner housing (arrows).
- Remove engine covers.

- Unbolt crankcase ventilation hose -1- at cylinder head cover and heat
shield.
- Unbolt both oil supply line bolts -3-.
- Remove heat shield -4-.
- Remove sleeve -2- from coolant return hose.
Pa
ge 41 of 50 Turbochar
ger s
ystem
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.1

- Use 3094 hose clamp to pinch off coolant return hose.
Pa
ge 42 of 50 Turbochar
ger s
ystem
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.1

21-32

- Remove coolant return hose at line to
turbocharger. Line remains bolted to
turbocharger.

- Unbolt oil supply line -7- at turbocharger.

Note:
The exhaust flexpipe must not be bent more than
10 , otherwise it may be damaged.
- Unbolt Three Way Catalytic Converter (TWC)
from turbocharger -6-.

- Unbolt turbocharger from exhaust manifold -5-
.

- Move turbocharger to side and remove coolant
supply line banjo fitting.

- Remove turbocharger.

Installing
Installation is the reverse of removal, noting the
following:

- Perform the following steps before tightening
turbocharger:
Pa
ge 43 of 50 Turbochar
ger s
ystem
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.1

- Loosely bolt coolant supply line to vacuum
diaphragm for charge air pressure regulation
valve.

- Tighten banjo fitting, then tighten mounting
bolt for bracket to proper torque.
Pa
ge 44 of 50 Turbochar
ger s
ystem
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.1

21-33

Note:
Add oil to turbocharger through oil supply line
connection flange.

- Fill up coolant Page 19
-4 .

WARNING!

The cooling system is pressurized when the
engine is warm. When opening the expansion
tank, wear gloves and other appropriate
protection, cover the cap with a cloth and
open carefully to relieve system pressure
slowly.

Note:
After installing the turbocharger, let engine idle
for approx. 1 minute without increasing engine
speed. This ensures adequate oil supply to the
turbocharger.

- Check engine oil level Page 17
-27
.
Pa
ge 45 of 50 Turbochar
ger s
ystem
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.1

21-34

Tightening torques

Component
Tightening
torques
Oil return line to turbocharger 10 Nm (7 ft
lb)
Turbocharger bracket to
turbocharger (bolt and washer
assembly M8)
1) 40 Nm (30 ft
lb)
Turbocharger bracket to cylinder
block 45 Nm (33 ft
lb)
Oil feed line to turbocharger 25 Nm (18 ft
lb)
Coolant supply pipe bracket to
turbocharger 10 Nm (7 ft
lb)
Oil supply line bracket to cylinder
head 20 Nm (15 ft
lb)
Coolant supply line to
turbocharger 25 Nm (18 ft
lb)
Crankcase ventilation line to
cylinder head 10 Nm (7 ft
lb)
Coolant return line to
turbocharger 30 Nm (22 ft
lb)
Turbocharger to exhaust
manifold 35 Nm (26 ft
lb)
Three Way Catalytic Converter 30 Nm (22 ft
Pa
ge 46 of 50 Turbochar
ger s
ystem
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.1