BMW 3: Engine housing, Crankshaft drive
BMW 3 Series G20 (2018-2025) Training manual / B46TU-B48TU Engines / Engine Mechanical / Engine housing, Crankshaft drive
Engine housing
Cylinder head
The cylinder head is made of aluminum.
Only slight modifications have been made to the B46TU head compared to the B46.
Cylinder head
Crankshaft drive
Crankshaft
Comparison B46 crankshaft with B46TU crankshaft
The crankshaft of the B46TU engine have been revised. Material adaptations have to both the counterweights and the connecting rod bearing journals have made it possible to achieve weight savings of up to 1043 g (2.3 lbs).
A reinforced crankshaft with larger main bearing diameter is used in the B48A20T1 engine.
Comparison of crankshaft B46 engine with B46TU engine
- Crankshaft of B46 engine
- Crankshaft B46TU engine
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Connecting rod - Crankshaft drive
Connecting rod
Piston
Area transferring the force
Wrist pin
Connecting rod bearing with shaped bore hole
Connecting rod
Connecting rod bearing (B46TU only)
Small connecting rod eye (trapezoid
IROX coating - Crankshaft drive
Detailed magnification of the IROX coating
IROX-coated bearing shell
Oil film
IROX coating
Bearing shell
Binding resin
Hard particle
Solid lubricant
The IROX coating is applied to a conventi
Chain drive - Crankshaft drive
Features:
Chain drive at the side of the engine emitting the forces.
Single-part chain drive for driving the camshafts.
Single sleeve-type chain 8 mm.
Electric motor of the combined oil-vacu
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Displays in the instrument
cluster
Gray steering wheel symbol:
The system is on standby.
Green steering wheel symbol:
The system is activated.
Yellow flashing steering wheel
symbol:
Lane marking driven over.
The steering wheel vibrates
where applicable.
Yellow steering wheel symbol
and a signal sounds, if applicable:
System interrup
Monitoring functions
High-voltage interlock loop
The SME control unit evaluates the signal of the high-voltage interlock loop
and checks whether there
is an open circuit with this circuit. In the event of an open circuit, the
battery management electronics
control unit can cause the high-voltage system to perform a qu
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