Nowadays, many car models feature badges such as ‘1.8T’ or ‘2.0T’ on the rear; the ‘T’ here indicates that the vehicle is fitted with a turbocharged engine.

Fig. 1

A turbocharger (Fig. 1) utilises the exhaust gases from the engine to drive the turbine (located within the exhaust manifold); the turbine, in turn, drives the coaxial impeller situated within the intake manifold. The impeller compresses the fresh air in the intake manifold and then feeds the pressurised air into the cylinders.

The greatest advantage of a turbocharged engine is that it can significantly increase the engine’s power and torque without increasing its displacement. Engine power can be increased by approximately 40 per cent or even more.

Note: When a turbocharged engine is idling after starting, do not apply full throttle immediately; you must wait until oil pressure has built up in the turbocharger before doing so.

Steps for removing a turbocharger:

01  Raise the vehicle, remove the lower engine guard and drain the coolant. 

02  Loosen the hose clamps on the air duct indicated by the arrows in Figure 2, disconnect the air duct and move it to one side.

Fig. 2

Fig.3

04  As shown in Figure 4, unscrew nut 2 from underneath the vehicle; do not unscrew nut 1 at this stage.

Fig.4

05  As shown in Figure 5, unscrew the fixing bolt 1 on the oil return pipe and loosen the bracket’s fixing bolt 2 by two turns; do not remove it.

Fig.5

Note: Steps ① to ⑤ should all be carried out whilst the vehicle is on the hoist.

06  Lower the vehicle, remove the bonnet, disconnect the negative battery cable, and remove the air filter housing. 
07  As shown in Figure 6, remove oxygen sensor 2 from its bracket and disconnect its connector 1.

Fig.6

08  Unscrew the crankshaft case exhaust pipe retaining bolts from the exhaust turbocharger. 

09  Disconnect the connectors for the boost pressure regulator and the turbocharger recirculation air valve. 10  In the engine compartment, unscrew nut 1 (shown in Figure 4) and push the three-way catalytic converter backwards. 

11  Remove the fixing bolts for the exhaust heat shield at the front oxygen sensor and remove the heat shield.

12  As shown in Figure 7, unscrew and remove the fastening bolt 1 on the coolant return pipe; unscrew bolt 2 on the oil inlet pipe and remove the oil inlet pipe. Finally, unscrew and remove the nut indicated by the arrow.

Fig.7

13  Loosen the fixing bolt 1 on the coolant inlet pipe shown in Figure 8, then disconnect the coolant inlet pipe 2. Pull the turbocharger away from the double-ended fixing bolt in the direction of the arrow shown in the figure, and lift the turbocharger upwards to remove it.

Fig.8