Code numbers on crankshaft

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

Code number 1 = bearing shell (2) Yellow.

Code number 2 = bearing shell (2) Green.

Code number 3 = bearing shell (2) Red.

IMPORTANT: The color combination Yellow and Red must not be fitted; the bearing colors Green/Green must be selected for this color combination, see table.

Fig 1: Identifying Bearing Shell

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Installation example:

For bearing 1 with code letter A on the crankcase and code number 1 on the crankshaft bearing shell (1) with the color Yellow is required for the crankcase and bearing shell (2) with the color Yellow for the crankcase lower half (bedplate).

Bearing 2:A and 2 colors Yellow and Green.

Bearing 3:B and 2 colors Green and Green.

Bearing 4:C and 2 colors Red and Green.

Bearing 5:B and 1 colors Green and Yellow.

Bearing 6:C and 3 colors Red and Red.

Bearing 7:C and 1 colors Green and Green.

Fig 2: Identifying Bearing Shell

Courtesy of BMW OF NORTH AMERICA, INC.

The color combination Yellow and Red must not be fitted.

Installation:

Possible color combinations for mounting the crankshaft in the crankcase.

COLOR COMBINATIONS FOR MOUNTING CRANKSHAFT IN CRANKCASE

(A 1) Crankcase/Yellow	(B 1) Crankcase/Green	(C 1) Crankcase/Green
(A 1) Crankcase lower half/Yellow	(B 1) Crankcase lower half/Yellow	(C 1) Crankcase lower half/Green
(A 2) Crankcase/Yellow	(B 2) Crankcase/Green	(C 2) Crankcase/Red
(A 2) Crankcase lower half/Green	(B 2) Crankcase lower half/Green	(C 2) Crankcase lower half/Green
(A 3) Crankcase/Green	(B 3) Crankcase/Green	(C 3) Crankcase/Red
(A 3) Crankcase lower half/Green	(B 3) Crankcase lower half/Red	(C 3) Crankcase lower half/Red

Insert all bearing shells (2 and 3).

IMPORTANT: Clean sealing surfaces.
Do not clean sealing faces with a metal-cutting tool.

Clean sealing faces with special tool 11 4 470 only.

Determine bearing play with special tool 00 2 590.

Installation:

All measuring points must be free from oil and grease.

Use used screws to determine bearing play.

Fig 3: Identifying Bearing Shells

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Set up crankcase lower section (bedplate) with bearing shells.

Remove crankcase lower section (bedplate).

Read off bearing play at width of flattened plastic thread and measurement scale.

Crankshaft bearing clearance radial.

Installation:

Remove plastic thread.

Apply a light coat of oil to bearing shells and crankshaft.

Fig 4: Checking Bearing Play

Courtesy of BMW OF NORTH AMERICA, INC.

Install crankcase lower section (bedplate).

Assemble engine.