Turbocharger Overview

Turbocharger Overview


If mechanical damage is found on the turbocharger, for example, a destroyed compression wheel, it is not enough to just replace the turbocharger. Perform the following steps to prevent subsequent damage.

• Check the air filter housing, the air filter element and the intake hoses for contamination.

• Check the entire charge air circuit and cooler for contamination.

If contaminants are found in the charge air circuit, the circuit must be cleaned and the cooler replaced if necessary.

• Various hose connections are secured.

• The charge air system must be properly sealed.

• Replace the self-locking nuts.

• Before installing the oil supply line, fill the turbocharger with engine oil at the oil supply line connection.

• After installing the turbocharger, let the engine run at idle for approximately 1 minute, without increasing the engine speed. This ensures that turbocharger is lubricated.

• The components illustrated here are for cylinder bank 2. They are a mirror image of the components for cylinder bank 1.

Follow all safety precautions. Refer to => [ Safety Precautions ] Safety Precautions.

Follow the guidelines for cleanliness. Refer to => [ Clean Working Conditions ] Clean Working Conditions.






1 to the Connecting Pipe

• Vehicles with engine code BKW, see => [ (Item 12) Connecting Pipe ] EGR Components.

• Vehicles with engine code BWF, see => [ (Item 11) Connecting Pipe ] EGR System.

2 Exhaust Manifold

• Exhaust manifold overview. Refer to => [ Exhaust Manifold Overview ] Exhaust Manifold Overview.

3 Exhaust Gas Temperature Sensor

• 45 Nm

• Only on vehicles with engine code BWF

Cylinder bank 1:

• Exhaust gas temperature sensor 1 (G235).

Cylinder bank 2:

• Bank 2 exhaust gas temperature sensor 1 (G236).

4 Securing Clamp

• 8 Nm

5 Turbocharger

• Can only be replaced when the engine is removed. Refer to => [ Engine, Removing ] Engine, Removing.

• Tighten the oil supply line banjo bolt to 23 Nm.

• When installing, tighten the clamp - item 4 - first and then the turbocharger.

6 to the Front Exhaust Pipe with Catalytic Converter

• Vehicles with engine code BKW, see => [ (Item 7) Front Exhaust Pipe with Catalytic Converter ] Front Exhaust Pipe with Catalytic Converter.

• Vehicles with engine code BWF, see => [ (Item 12) Front Exhaust Pipe with Catalytic Converter ] Front Exhaust Pipe with Catalytic Converter and Particle Filter.

7 Bolt

• 40 Nm

8 Turbocharger Servo Motor

• Component of the turbocharger cannot be replaced.

Cylinder bank 1:

• Turbocharger 1 servo motor (V280).

Cylinder bank 2:

• Turbocharger 2 servo motor (V281).

9 Seal

• Always replace

• Before installing, check the sealing surfaces for contamination and clean if necessary.

10 Bolt

• 8 Nm

11 Connecting Pipe

12 to the Charge Air Pipe

• See => [ (Item 8) Charge Air Pipe ] Description and Operation.

13 Sealing Sleeve

• Replace if damaged.

• Make sure it is tight.

14 Connecting Pipe

• From the crankcase ventilation valve.