69
N55 Engine
Vacuum Pump
The vacuum pump is similar to that used on the N63 engine. It is a two-stage pump and
therefore has two connections. The first stage is for the brake booster and the second for
the auxiliary consumers.
N55, vacuum pump
The largest area is used for the first stage, ensuring vacuum is built up at a rapid rate for
the brake booster. The last section is the opening stage for the auxiliary consumers. It
therefore takes longer to build up the vacuum here, as shown in the following diagram.
Index
Explanation
1
Non-return valve for brake booster
2
Non-return valve for auxiliary consumer
3
Connection opening for auxiliary consumers
4
Vacuum pump housing
5
Vane
6
Connection opening for brake booster
Summary of Contents for N55
Page 29: ...29 N55 Engine N55 oil passages front view...
Page 35: ...35 N55 Engine N55 crankcase ventilation naturally aspirated mode...
Page 37: ...N55 crankcase ventilation turbocharged boost mode 37 N55 Engine...
Page 57: ...N55 Air Intake and Exhaust System 57 N55 Engine...
Page 83: ...83 N55 Engine Circuit Diagram N55 circuit diagram connection to vehicle electrical system...
Page 85: ...85 N55 Engine Engine Cooling Circuit Diagram N55 circuit diagram engine cooling...
Page 88: ...88 N55 Engine Digital Motor Electronics Circuit Diagram N55 MEVD17 2 Circuit Diagram...