BMW 3: Engine identification
B46TU engine
![Engine identification](images/books/3376/index.2.png)
Engine identification - transverse mounted shown
B48TU engine
![Engine identification](images/books/3376/index.3.png)
Engine identification - transverse mounted shown
- Engine number
- Engine identification
The 7-digit engine identification is located on the crankcase in the area of
the mounting for the
crankshaft alignment pin. The first 6 digits of the engine identification code.
Only the seventh digit
is different. The seventh digit of the engine identification code is the test
number of the type approval
certification.
The 4th digit in the engine identification shown above is an A, this represents
its a transverse mounted
engine that will be installed in the F39 M35i. The G20 and G29 will have a B in
the 4th position that
represents the engine is longitudinal mounted.
The consecutive engine number is embossed above the engine identification. Using
these two
numbers the engine can be clearly identified by the manufacturer.
Technical data
The B46B20O1 and B46B20T1 engine is described:
![Technical data](images/books/3376/index.4.png)
Model overview
The table below provides an overview of the models in which the new B46TU and
B48TU engine is
used.
![Technical data](images/books/3376/index.5.png)
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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
Comparis
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
SEE MORE:
Safety information
Warning
Steering wheel adjustments while driving can
lead to unexpected steering wheel movements.
Vehicle control could be lost. There is a risk of
accident. Adjustng the steering wheel while the
vehicle is stationary only.
Manual steering wheel
adjustment
1. Fold the lever dow
General information
If you open the trunk lid via Comfort Access,
locked doors will not be unlocked.
To avoid locking the vehicle key in the vehicle,
do not place the vehicle key in the cargo area.
Safety information
Warning
Body parts can be jammed when operating the
trunk lid. There is a risk of