11 21 531 Replacing All Crankshaft Main Bearings (S85)

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Special tools required:

00 2 590

IMPORTANT:

Repair crankcase used / crankshaft used
If the bearing channel is opened and closed again after engine operation, all main bearing shells must be replace with special repair bearing shells.

Altered settling behavior at the crankcase.

Repair bearing shells are marked with an (R) on their backs.
Repair crankcase used / crankshaft new
Repair bearing shells marked with (R) must be used.

The crankshaft comes as a set together with the bearing shells. The bearing shells for the bedplate are provided i accordance with the crankshaft classification. For the crankcase bearing shells, the green bearing shells are always provided. The half classification is retained.
Repair crankcase new / crankshaft used
The bearing shells also designated for initial installation must be used.

The crankcase comes as a set together with the bearing shells. The bearing shells for the crankcase are provided accordance with the crankcase classification. For the bedplate, the green bearing shells are always provided. The half classification is retained.
Repair crankcase new / crankshaft new
The bearing shells also designated for initial installation must be used.

The bearing shells provided with the crankcase must be used.

The crankcase comes as a set together with the bearing shells. The bearing shells for the crankcase are provided accordance with the crankcase classification. For the bedplate, the green bearing shells are always provided. The half classification is retained.

Necessary preliminary tasks:

Engine removed.
Remove crankshaft .

Installation:

Bearing shell (1) is a guide bearing.

Remove bearing shells (1) and (2).

Observe bearing classification.

Determine bearing play with special tool 00 2 590.

Fig 1: Identifying Bearing Shells

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Lay step bearing (1) on 6th bearing block.

Fig 2: Identifying Step Bearing On 6th Bearing Block

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Installation:

Bearing shell (1) with lubricant groove must be fitted in crankcase upper section.

Bearing shell (2) without lubricant groove must be fitted in crankcase lower section (bedplate).

Fig 3: Identifying Bearing Shell

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Bearing classification on bedplate bearing block.

Observe color allocation on crankshaft (1 to 6).

V= Violet.

G = Green.

Y= Yellow.

Fig 4: Identifying Color Allocation On Crankshaft (Bedplate Bearing Block)

Courtesy of BMW OF NORTH AMERICA, INC.

Bearing classification on crankcase bearing block.

Observe color allocation in crankcase (1 to 6).

V= Violet.

G = Green.

Y= Yellow.

Fig 5: Identifying Color Allocation On Crankshaft (Crankcase Bearing Block)

Courtesy of BMW OF NORTH AMERICA, INC.

Lay plastic thread (Plastigage) on crankshaft.

Fit and bolt down bedplate.

NOTE: Do not twist crankshaft.

Remove bedplate.

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

Crankshaft bearing clearance radial.

Fig 6: Identifying Plastic Thread (Plastigage) On Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.