Main bearing classification (3) for crankcase lower half (bedplate), code numbers 1 2 3, see table

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Fig 1: Identifying Seven Digit Code On Crankshaft Web Surface

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Code letters (4 and 5) are exclusively required for a machined crankshaft.

Code letter (4) as per table, main bearing.

B= build date 1 (B 1 2 3 -0.25 mm).

B= build date 2 (C 1 2 3 -0.50 mm).

Code letter (5) as per table, lift bearing.

B= construction stage 1 (-0.25 mm).

C = construction stage 2 (-0.50 mm)

Observe BEARING CLASSIFICATION .

Main bearing classification (1) in crankcase, code letters A/B or C, see table.

Installation:

When all the letters and number code have been determined, the bearing shell color must be allocated, see table.

Fig 2: Identifying Bearing Classification Of Crankcase Upper Section

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

The letter/number combination produces a bearing shell pairing.

Identification by different colors.

IMPORTANT: First bearing point is on the timing drive.
The color combination Yellow and Red must not be fitted.
Engine damage will result if excessively small bearing play is determined.