Camshaft, Removing And Installing: Removing

• The cylinder head cover sealing surfaces on the cylinder head must not be worked on.
• During installation, all cable ties must be installed at the same location.
• During installation, all heat shield boots must be installed at the same location.

All except Audi Q7/Q8:

-- Remove the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .

Continuation for All Vehicles:

-- Remove the air filter housing. Refer to AIR FILTER HOUSING, REMOVING AND INSTALLING .

-- Remove the noise insulation (front). Refer to OVERVIEW - NOISE INSULATION .

Vehicle with high-voltage system:

-- Remove the bolt -arrow- from the particulate filter bracket.

Audi A6/A7 with High-Voltage System:

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-- De-energize the high-voltage system. Refer to HIGH-VOLTAGE SYSTEM DE-ENERGIZED .

-- Remove the bolts -arrows-, free up the high-voltage cable -1- and slightly press to the front.

Continuation for all Vehicles with High-Voltage System:

-- Remove the bolt -arrow- from the catalytic converter bracket.

-- Loosen the screw-type clamp -arrow- and push the catalytic converter with particulate filter slightly toward the rear.

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Vehicles with Secondary Air System:

-- Remove the resonator for the secondary air system. Refer to SECONDARY AIR SYSTEM RESONATOR, REMOVING AND INSTALLING .

Audi A8/Q7/Q8 with Particulate Filter:

-- Remove the plenum chamber bulkhead. Refer to PLENUM CHAMBER BULKHEAD, REMOVING AND INSTALLING .

Audi Q7/Q8 with Particulate Filter:

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-- Disconnect the connector -2- for the Particulate Filter Differential Temperature Sensor -GX41-.

-- Remove the connector from the bracket and then free up the wires.

-- Remove the union bolt -1-, free up the pressure pipe on the clip -arrow- and move to the side.

Continuation for All Vehicles:

-- Remove the nuts -arrows- and the bolt -2-.

-- Free up the wires and remove the heat shield -1- (example illustration above).

-- Remove the bolts -2- and move the bracket to the side.

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-- Remove the upper timing chain cover. Refer to UPPER TIMING CHAIN COVER, REMOVING AND INSTALLING .

-- Disconnect the connector -2- for the Oxygen Sensor 1 After Catalytic Converter -GX7- -1- and free up the wires.

Audi Q7/Q8:

-- Loosen the hose clamp -2- and disconnect the hose for the EVAP system.

-- If installed, disconnect the connector -3- for the Fuel Tank Pressure Sensor 2 -G850-.

-- Remove the vacuum hose -3-.

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-- Press the release buttons on both sides and remove the secondary air injection hose -4-.

-- Loosen the hose clamp -1- and remove the air duct pipe -2-.

Continuation for All Vehicles:

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-- Disconnect the connectors and free up the wires.

• 1 -  For the Turbocharger Recirculation Valve -N249-
• 3 -  for Charge Air Pressure Control Module -GX34-

-- Press the release buttons on both sides and remove the crankcase ventilation hose -4-.

-- Disconnect the connectors and free up the wires.

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1. For the Camshaft Position Sensor 3 -G300-
2. Tank Ventilation Pressure Sensor 1 -G950- (for version)
3. For the Oxygen Sensor 1 Before Catalytic Converter -GX10- (remove from the bracket to do so)
4. For the EVAP Canister Purge Regulator Valve 1 -N80-

-- Remove the ignition coils. Refer to IGNITION COIL, REMOVING AND INSTALLING .

-- Remove the oil separator. Refer to OIL SEPARATOR, REMOVING AND INSTALLING .

-- Remove the high pressure pump. Refer to HIGH PRESSURE PUMP, REMOVING AND INSTALLING .

-- Remove the vacuum pump. Refer to VACUUM PUMP, REMOVING AND INSTALLING .

-- Open the heat shield boot.

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-- Loosen the hose clamp -arrow- and remove the coolant hose.

-- Disconnect the connector -2- from the cam adjustment actuator.

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-- Free up the vacuum hose -1- and the wires.

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-- Release the catches -arrows-, remove the wiring duct -2- with the wiring harness and move to the side.

All except Audi Q7/Q8:

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-- Loosen the hose clamp -2- and disconnect the hose for the EVAP system.

Continuation for All Vehicles:

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-- Lift the clip -3-, disconnect the coolant line -2- and free up from the cylinder head and push it toward the side.

-- Remove the vacuum hose -4-, disconnect the vacuum line -1- for the Intake Manifold Runner Control Valve -N316- and free it up at the cylinder head.

-- Remove the camshaft timing chain. Refer to CAMSHAFT TIMING CHAIN, REMOVING AND INSTALLING .

-- Apply the oil pump drive chain.

-- Install the Assembly Tool - Turning Over Tool :T10531/3  . In the "TDC point" the flat area -1- points upward. Install the Assembly Tool - Knurled Nut :T10531/4  . Turn the crankshaft with a 32 mm open end wrench 90° counter-clockwise out of "TDC".

-- Reduce the intake camshaft pretension using the Assembly Tool :T40427  in the -direction of arrow B-, pull the Camshaft Lock :T40271/2  out of the chain sprocket splines -arrow A-, and bring the intake camshaft into its resting position.

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-- Reduce the exhaust camshaft pretension using the Assembly Tool :T40427  in the -direction of arrow B-, pull the Camshaft Lock :T40271/1  out of the chain sprocket splines -arrow A-, and bring the intake camshaft into its resting position.

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-- Remove the cylinder head cover bolts in -1 to 6- sequence.

-- Carefully loosen the cylinder head cover -2- from the bonding with a screwdriver -1- and remove it together with the camshafts.

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• Pay attention that the camshafts do not fall out of the cylinder head cover.

-- Remove the camshaft and cover the open engine components.

-- If necessary for continuing work: mark the roller rocker lever and hydraulic lifter for reinstallation, remove them and place on a clean surface.