clock AUDI A8 1999 D2 / 1.G AHA ATQ Engines Valve Gear Service Manual

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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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.
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- Rotate crankshaft clockwise by turning mounting
bolt for toothed belt sprocket until lobes on
camshaft of hydraulic valve lifters to be checked
are pointing upward.

- Measure clearance between cam and valve
lifter.
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pair&id=AUDI.B5.GE03.15.1