BMW 3: 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
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
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
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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General information
Regularly remove foreign objects such as leaves
in the area below the windshield when the hood
is raised.
Wash your vehicle frequently, particularly in winter.
Intense soiling and road salt can damage the
vehicle.
Steam blaster and high-pressure
washer
Safety information
NOTICE
Concept
The vehicle can be accessed without operating
the vehicle key.
Carrying the vehicle key with you, e.g., in your
pants pocket, is sufficient.
The vehicle automatically detects the vehicle key
when it is in close proximity or in the car's interior.
General information
Comfort Access supports