Air intake

Air charging by turbocharger and air-to-air intercooler (Fig.10).

AIR FILTER

Dry air filter with replaceable element, located in a housing in the centre of the engine compartment.

TURBOCHARGER

Vane-type turbocharger, fixed geometry on the B180 CDI and variable geometry on the B200 CDI (Fig.9), separable from the exhaust manifold.

Fig. 9

Variable geometry turbo

1. 1
   Compressor inlet (fresh air)
2. 2
   Compressor outlet (charged air)
3. 3
   Exhaust gas to turbine wheel
4. 4
   Exhaust gas outlet
5. 5
   Flow passage, guide vanes 'closed'
6. 6
   Flow passage, guide vanes 'open'
7. 7
   Turbine housing
8. 8
   Turbine wheel
9. 9
   Compressor housing
10. 10
    Adjustable vane
11. 11
    Guide pivot, control linkage
12. 12
    Adjusting ring
13. 13
    Guide pivot, adjustable vane.

HEAT EXCHANGER

Air-to-air charge air cooler, located in front of the engine. It is placed in the air intake circuit between the turbocharger and the intake manifold.

Fig. 10

Boost circuit

1. 1
   Exhaust manifold
2. 2
   Turbocharger
3. 3
   Vacuum capsule
4. 4
   Pulsation damper
5. 5
   Heat exchanger
6. 6
   Intake manifold
7. 7
   Boost pressure sensor
8. 8
   Boost air temperature sensor.