1997 AUDI A8 AHA ATQ Engines Valve Gear Service Manual

- Install pull sleeve from 3241 seal installer onto camshaft.
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15-16


Rear sealing flange (left cylinder head)
The sealing flange and rear oil seal on the left cylinder head must be
replaced together as follows: - Press seal flush using 3241/1 press sleeve and 3241/3 bolt.
- Unbolt engine coolant expansion tank from bracket.
- Remove crankshaft ventilation line from cylinder head cover.
- Unbolt Camshaft Position (CMP) sensor.
Tightening torque: 10 Nm (7 ft lb)
- Unbolt shutter wheel for Camshaft Position (CMP) sensor G40 and
carefully pry out using screwdriver.
- Remove cylinder head cover.

- Remove double bearing cap (arrows).
- Remove seal and sealing flange.
- Clean running and sealing surfaces as well as contact surface of
double bearing cap.
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15-17


- Apply thin coat of sealant 454 300 A2 to hatched areas on double
bearing cap, install and tighten to 10 Nm (7 ft lb).
- Install pull sleeve from 3241 seal installer onto camshaft.

- Press seal flush using 3241/1 press sleeve and 3241/3 bolt.
- Carefully drive in sealing flange to stop using 3202 retractor and plastic
hammer.
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15-18

Cylinder head, removing and installing


Note:
The following instructions apply to the left
cylinder head.

Removing

Lock carrier in service position page 13
-
1 .

- Remove ribbed belt page 13
-8 .

- Remove toothed belt page 13
-12
.

- Remove engine cover (arrows).

- Remove noise insulation panel (arrows).
- Unbolt left and right-side front exhaust pipes from exhaust manifold.
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- Unbolt exhaust system from transmission bracket.
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15-19

- Place VAG1306 drip tray beneath engine.

- Open engine coolant expansion tank cap.

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.

- With bumper removed, open coolant drain plug (arrow) on lower left of
radiator by turning it counterclockwise. If necessary, attach accessory
hose to connection.
- With bumper installed, pull off retaining clamp for lower right radiator
hose (from radiator to engine) and disconnect radiator hose from
radiator.

- Using 3247 hex ball socket, open coolant drain plug on engine (arrow)
as well.
- Unbolt engine coolant expansion tank from bracket and lay aside
(remove if necessary).
-
Disconnect crankshaft housing ventilation line from cylinder head
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cover.
- Remove intake air duct between Mass Air Flow (MAF) sensor and
intake air elbow.
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15-20


- Disconnect blue harness connector on Intake Manifold Tuning (IMT)
valve.
- Disconnect black harness connector for intake air temperature sensor
on resonator.
- Cut tie wraps and move wiring to side.
- Disconnect vacuum line at cruise control vacuum diaphragm and at
vacuum booster.
- Unbolt cruise control vacuum diaphragm and unhook cruise control
vacuum diaphragm linkage at throttle body.
- Disconnect harness connector on throttle body and vacuum lines on
fuel pressure regulator.

- Disconnect harness connectors from camshaft adjustment valve and
from fuel injectors (arrows).
- Disconnect harness connectors from Engine Coolant Temperature
(ECT) sensor and Camshaft Position (CMP) sensor (arrows).
- Cut tie wraps on valve cover.
- Unclip wiring retainer on fuel rail and disconnect crankshaft housing
ventilation lines from left and right-side valve covers. Move hoses and
wiring clear (to rear).
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