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Home >> Audi >> 2014 >> S8 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 4.0L - Cylinder Head & VALVETRAIN - Engine Code(S): CEUA, CGTA, CTFA & CTGA >> 15 Cylinder Head, VALVETRAIN >> Timing Chain Cover >> Timing Chain Cover, Removing And Installing >> Left Timing Chain Cover, Removing And Installing >> Removing

Left Timing Chain Cover, Removing And Installing: Removing

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

WARNING:

Fire hazards and risk of damage for a faulty engine cover.

  • The engine cover must be always be installed before the hood is closed.
  • The engine may neither be started nor driven without an engine cover.

-- Drain the coolant, refer to COOLANT, DRAINING AND FILLING .

-- Remove the left front muffler, refer to FRONT MUFFLER, REMOVING AND INSTALLING .

-- Remove the plenum chamber bulkhead, refer to OVERVIEW - BULKHEAD .

Vehicles with the Engine Codes CGTA/CTFA: 

-- Loosen the clamps -arrows- and remove the left air guide pipe.

Fig 1: Identifying Left Air Guide Pipe Clamps
GWWA24-11000Courtesy of AUDI OF AMERICA, LLC

Continuation for All Vehicles: 

NOTE: Ignore -2 and 4-.

-- Remove the connector -1- for the Oxygen Sensor after Three Way Catalytic Converter -G130- -3- from the bracket and disconnect it. Free up the wire.

Fig 2: Identifying Oxygen Sensor After Three Way Catalytic Converter Connector And Bracket
GWWA24-10908Courtesy of AUDI OF AMERICA, LLC
NOTE:

The catalytic converter for the cylinder bank 1 (right) is on the left in the vehicle.

Fig 3: Identifying Nuts
GWWA26-11198Courtesy of AUDI OF AMERICA, LLC

-- Free up the wire for the Heated Oxygen Sensor -G39-.

-- Remove the nuts -arrows- from the cylinder bank 1 (right) and then remove the catalytic converter in the left of the vehicle, toward the rear.

-- Loosen the clamp -1- and remove the air guide hose.

Fig 4: Identifying Air Guide Hose, Clamp And Bolt
GWWA15-11258Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolt -2-.

-- Free up the vacuum line and press it toward the rear.

-- Remove the bolts -1 and 2-.

Fig 5: Identifying Bolts
GWWA19-11417Courtesy of AUDI OF AMERICA, LLC
CAUTION:

Danger of causing damage to the coolant pipe.

  • Do not bend the coolant pipe.

-- Remove the rear upper coolant pipe from the right cover for the timing chain guard -arrow- and set it aside.

NOTE: The catalytic converter and the turbocharger support are removed to improve the clarity of the illustration.

-- Remove the bolts in the following sequence: -8 to 1-.

Fig 6: Left Timing Chain Cover, Tightening Specifications and Sequence
GWWA15-11216Courtesy of AUDI OF AMERICA, LLC

-- Push the mount -arrow- with the wire to the side.

-- Carefully remove the left cover for the timing chain from the bond.