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Home >> Audi >> 2016 >> S8 Plus >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Turbocharger, Supercharger [CEUA,CGTA,CTFA,CTGA,CTGF,DDTA] >> 21 Turbocharger, Supercharger >> Turbocharger >> Turbocharger, Removing And Installing >> Removing

Turbocharger, Removing And Installing: Removing

NOTE:

Follow all the guidelines for clean working conditions. Refer to GUIDELINES FOR CLEAN WORKING CONDITIONS .

If mechanical damage (for example a destroyed compression wheel) is found on the turbocharger, just replacing the turbocharger is not enough. To avoid subsequent damage later, perform the following steps:

Left Turbocharger:

-- Remove the housing for the charge air cooler. Refer to CHARGE AIR COOLER HOUSING, REMOVING AND INSTALLING .

Right Turbocharger:

-- Remove the right secondary air injection combination valve. Refer to COMBINATION VALVE, REMOVING AND INSTALLING .

Continuation for Both Sides:

-- Remove the left and right front muffler. Refer to FRONT MUFFLER, REMOVING AND INSTALLING .

-- Remove the plenum chamber bulkhead. Refer to BULKHEAD .

Vehicles with the Engine Codes CGTA/CTFA/DDTA:

Fig 1: Identifying Left Air Guide Pipe And Clamps
GWWA24-11000

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

Continuation for All Vehicles:

Fig 2: Identifying Left And Right Connectors
GWWA21-10708

-- Disconnect the left and right connectors -1 and 2- .

-- Remove the connectors from the bracket, disconnect them and then free up the wires.

Fig 3: Identifying Heated Oxygen Sensors And Connectors
GWWA24-10908

1 - For the Oxygen Sensor after Three Way Catalytic Converter -G130- -3-

4 - For the Heated Oxygen Sensor -G39- -2-

-- Free up the wiring harness for the Heated Oxygen Sensor 2 -G108- and Oxygen Sensor 2 after Catalytic Converter -G131- .

NOTE:

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

Fig 4: Identifying Catalytic Converter Nuts
GWWA26-11198

-- 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.

NOTE:

The catalytic converter for the cylinder bank 2 (left) is on the right in the vehicle.

Fig 5: Identifying Catalytic Converter Nuts
GWWA26-11199

-- Remove the nuts -arrows- from the cylinder bank 2 (left) and then remove the catalytic converter on the right in the vehicle, toward the rear.

-- Remove the bolts -1, 4 and 7- , then remove the retaining plates -2 and 6- .

Fig 6: Identifying Retaining Plates And Bolts
GWWA21-10705

-- Remove the coolant lines -3 and 5- from the left and right turbocharger.

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

Fig 7: Identifying Air Guide Hose, Clamp And Bolt
GWWA15-11258

-- Remove the bolt -2- .

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

-- Remove the bolts -1 and 3- and then press the lower rear coolant pipe -2- toward the rear.

Fig 8: Identifying Lower Rear Coolant Pipe And Bolts
GWWA19-11468

-- Remove the bolts -1, 2 and 3- and then remove the turbocharger support -4- .

Fig 9: Identifying Turbocharger Support And Bolts
GWWA21-10706

-- Lift up the spring -2- with a small screwdriver and remove the actuator rod -3- from the ball studs to remove the affected turbocharger actuator -23-  OVERVIEW - TURBOCHARGER -List Item:Actuator Rod.

Fig 10: Detaching Gas-Filled Strut For Hood By Lifting Retaining Spring Using Small Screwdriver
GWWA55-10085

Vehicles with the Engine Codes CEUA/CTGA/CTGF:

Fig 11: Identifying Air Guide Pipe And Bolts
GWWA21-10740

-- Remove the bolts -arrows- and then remove the air duct pipe -1- .

Left Turbocharger:

Fig 12: Identifying Bolts And Hose Clamps
GWWA21-10707

-- Disconnect the connector -arrow- .

-- Remove the bolts -1 and 3- and then remove the hose lines.

-- Loosen the hose clamps -2- to remove the oil return hose.

-- Remove the nuts in the sequence -8 to 1- and then remove the turbocharger.

Fig 13: Identifying Left Turbocharger Bolt Tightening Sequence
GWWA21-10603

Right Turbocharger:

Fig 14: Identifying Connector And Bolts
GWWA21-10709

-- Disconnect the connector -arrow- .

-- Remove the bolts -1 and 2- and then remove the hose lines.

-- Loosen the hose clamps -3- to remove the oil return hose.

-- Remove the nuts in the sequence -8 to 1- and then remove the turbocharger.

Fig 15: Identifying Right Turbocharger Tightening Sequence
GWWA21-10604