11 21 531 Replacing all crankshaft main bearings (S65)

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IMPORTANT:

Repair crankcase worn St.0 or 1/crankshaft worn St.0.
If the bearing channel is opened and closed again after engine operation, all main bearing shells must be replaced with special repair bearing shells.

Altered settling behavior at the crankcase.

Repair bearing shells are marked with an (R) on their backs.
Repair crankcase worn St.0 or 1/crankshaft new St.0.
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 in 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 St.0 or 1/crankshaft worn St.0.
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 in accordance with the crankcase classification. For the bedplate, the green bearing shells are always provided. The half classification is retained.
Repair crankcase new St.0 or 1/crankshaft new St.0.
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 in 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) with lubricant groove must be fitted in crankcase upper section.

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

Determine bearing play with special tool 002590 MEASUREMENT AID .

Insert crankshaft without engine oil, bolt crankcase upper and lower sections together.

Fig 1: Identifying Bearing Shells

Courtesy of BMW OF NORTH AMERICA, INC.

Lay plastic thread (Plastigage) on crankshaft.

Fit crankcase upper section on lower section and bolt together.

NOTE: Do not twist crankshaft.

Remove crankshaft.

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

Crankshaft bearing clearance radial See CRANKSHAFT AND BEARINGS S65 or CRANKSHAFT AND BEARINGS S65 .

Fig 2: Reading Bearing Play At Width Of Flattened Plastic Thread

Courtesy of BMW OF NORTH AMERICA, INC.

Crankcase upper half

Installation:

Bearing shell (2) is a guide bearing.

Pay attention to guide lugs on bearing shells (see arrow).

Remove all bearing shells with lubricant groove.

Observe bearing classification See CRANKSHAFT AND BEARINGS S65 or CRANKSHAFT AND BEARINGS S65 .

Fig 3: Identifying Crankcase Upper Half Guide Lugs Position

Courtesy of BMW OF NORTH AMERICA, INC.

Crankcase lower half

Installation:

Bearing shell (2) is a guide bearing.

Pay attention to guide lugs on bearing shells (see arrow).

Remove all bearing shells without lubricant groove.

Observe bearing classification See CRANKSHAFT AND BEARINGS S65 or CRANKSHAFT AND BEARINGS S65 .

Fig 4: Identifying Crankcase Lower Half Guide Lugs Position

Courtesy of BMW OF NORTH AMERICA, INC.

Clean sealing face (1) with special tool 11 4 470.

Insert bearing shells (2) without lubricant groove.

Insert guide bearing (3) without lubricant groove on bearing seat 5.

Fig 5: Identifying Sealing Face, Bearing Shells And Guide Bearing

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Release screws (1).

Remove oil nozzle (2) towards top.

Fig 6: Identifying Oil Nozzle And Screws

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Bearing classification on bedplate bearing seat.

Observe color allocation on crankshaft (1 to 5).

V = Violet.

G = Green.

Y = Yellow.

Fig 7: Identifying Bearing Classification On Bedplate Bearing Seat

Courtesy of BMW OF NORTH AMERICA, INC.

Bearing classification on crankcase bearing seat.

Observe color allocation in crankcase (1 to 5).

V = Violet.

G = Green.

Y = Yellow.

Fig 8: Identifying Bearing Classification On Crankcase Bearing Seat

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.