BMW 3 of the E46 series
since 1998 release
Repair and operation of the car
BMW 3 of the E46 series
+ BMW 3 Cars (E46)
+ Current leaving and service
+ Cooling systems, heating
- Power supply systems, injection and release
Security measures and rules of observance of purity during the work with fuel system
Removal and installation of the sensor of a reserve of fuel / fuel pump
Check of the sensor of a reserve of fuel
+ Power supply system of petrol engines
+ System of injection of fuel of the petrol engine
+ Power supply system of diesel engines
- System of production of the fulfilled gases
Operation of the catalytic converter
Security measures for an exception of damages of the catalytic converter
Removal and installation of system of release
Check of tightness of system of production of the fulfilled gases
Removal and installation of the sensor of oxygen
Removal and installation of a final collector
+ Electric equipment of the engine
+ RKPP and transmission line
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
+ Schemes of electric equipment
TurbocompressorThe diesel engine is equipped with a turbocompressor. The turbocompressor has two turbines installed on one shaft and placed in two separate cases: the driving turbine working from the fulfilled gases and the delivery turbine compressing the air coming to the engine. Thus the angular speed of rotation of a shaft of turbines reaches 120 000 rpm. Greasing of a turbocompressor is carried out from the engine lubrication system.
The increase in engine capacity at the expense of a turbo-supercharging reaches 100%. Along with increase of power owing to application of a turbocompressor also the torque increases. Growth of power among other things depends on pressure of nadduvayemy air which at engines of cars makes 0.4 - 0.8 bars. Air pressure by means of the sensor of pressure is controlled and regulated by an engine monitor. Thus, excess of pressure of air above the admissible is excluded.
Between a turbocompressor and an inlet path of the engine there is a cooler of nadduvayemy air. Cooling of air promotes increase of engine capacity as cold air thanks to higher density has higher content of oxygen.
BMW car turbocompressor
The 3rd series has the adjustable directing shovels, control with which is exercised from a monitor the engine via the electromagnetic valve and a vacuum box. It provides achievement of optimum pressure of air at any number of turns of the engine that in turn provides higher torque and higher engine capacity, in particular, at low numbers of turns.
Contrary to petrol engines at diesel it is not required to reduce extent of compression because of pressurization. Thus, on low turns injectable fuel is completely burned.
The turbocompressor represents the mechanism of very high precision. Therefore, as a rule, in case of malfunction the turbocompressor is replaced entirely.