BMW 3: Engine housing, Crankshaft drive
BMW 3 Series G20 (2018-2026) 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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Start-up system
Starter motor
The combustion engine B46 can be started via the conventional starter motor
and the electrical
machine.
The following table shows when and under which conditions the respective start
option is used:
Auxiliary battery
G20 PHEV, auxiliary battery
Safety battery terminal 2 (SB
Surround View with
Parking Assistant Plus
Concept
The system provides assistance in parking and
maneuvering. The area around the vehicle is
shown on the Control Display.
General information
Several cameras capture the area from different
selectable perspectives. In addition, assistance
functions, for instance guidelines, can be faded
into t
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