BMW 3: Operating temperature
The positions of the rotary valve at engine operating temperature are shown by area C of the heat management module circuit diagram.
Operating temperature
The graphic shows control with the engine at operating temperature. The position of the rotary valve means that the cross-sections of the respective coolant lines are open to a greater or lesser extent depending on the coolant temperature. The coolant flows with a varying volumetric flow through the small coolant circuit, the large coolant circuit and the heater circuit. Depending on the load request, the crankcase's coolant connection is opened by the electrical Split Cooling valve, thus cooling the crankcase. Large engine operation ranges are covered with the crankcase coolant circuit closed.
Maximum cooling requirement
The maximum cooling requirement is shown at point E of the heat management module circuit diagram.
Maximum cooling requirement
To provide maximum cooling at high dynamic loads and/or high ambient temperatures, the radiator connection is fully opened (100%) and the bypass line is completely closed . Additionally, the heater circuit is 90% closed to achieve the maximum cooling thanks to the maximum coolant volumetric flow through the large coolant circuit.
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Coolant pump
The layout and function of the coolant pump have been revised and adapted to
match the cooling
concept of the B46TU/B48TU engines.
Coolant pump
Pressure relief valve closed (pressure <
Exhaust System
Exhaust turbocharger
Exhaust turbocharger
The exhaust turbocharger can be replaced individually and is exclusively made
of steel. The boost
charge pressure is still controlled by an electrical waste
Fuel System
The fuel system is made up of the fuel supply and fuel preparation systems.
The fuel supply includes
the fuel tank with all mounted parts and the fuel lines up to the engine
compartment.
The fuel p
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Emergency wheel
Concept
In the event of a flat tire, the emergency wheel
can be used in place of the wheel with the defective tire. The emergency wheel
is only intended
for temporary use until the defective tire/wheel
has been replaced.
General information
Mount one emergency wheel only.
Also check the tire infla
Flat Tire Monitor FTM
Concept
The system detects tire inflation pressure loss
on the basis of rotation speed differences between
the individual wheels while driving.
In the event of a tire inflation pressure loss, the
diameter and therefore the rotational speed of
the corresponding wheel changes. The difference
will be
