11 21 500 Removing and Installing/Replacing Crankshaft (N73)

WARNING: This page is about a different car, the 2008 BMW 760Li and 2007 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Replace main bearing screws.
Do not wash off bolt coating.
There must be no oil in the blind holes(risk of cracking).

Necessary preliminary tasks:

Remove engine. See 11 00 050 Removing and Installing Engine (N73)
Remove left cylinder head. See 11 12 105 Removing and Installing Left Cylinder Head (N73)
Remove right cylinder head. See 11 12 106 Removing and Installing Right Cylinder Head (N73)
Remove hub for vibration damper. See 11 23 010 Removing and Installing/Replacing Vibration Damper (N73)
Remove lower timing case cover. See 11 14 110 Removing and Installing Lower Timing Case Cover (N73)
Remove rear timing case cover.
Remove upper oil sump. See 11 13 010 Removing and Installing/Replacing Oil Sump Top Section (N73)
Remove oil pump. See 11 41 000 Removing and Installing/Replacing Oil Pump (N73)
Remove flywheel. See 11 22 510 Removing and Installing/Replacing Flywheel (N73)
Remove all pistons. See 11 25 530 Removing and Installing/Replacing All Pistons (N73)

Release taper screw mount (1) on all main bearing caps.

Installation:

Tightening torque 11 11 3AZ. See 11 11 ENGINE BLOCK

Release thread support bushings (2) on all main bearing caps.

Installation:

Tightening torque 11 11 3AZ. See 11 11 ENGINE BLOCK

Release main bearing bolts along lines (3).

Fig 1: Identifying Main Bearing Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Tightening torque 11 11 2AZ. See 11 11 ENGINE BLOCK

Remove main bearing caps 1 to 7.

Main bearing shell (1) on bearing cap number 7 is a guide bearing.

Lift out crankshaft (2).

Fig 2: Identifying Main Bearing Shell On Bearing Cap

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew thread support bushings in main bearing caps.

Fig 3: Identifying Main Bearing Caps

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Install main bearing shells (1) with lubrication groove in crankcase.

Install main bearing shells (2) without lubrication groove in the main bearing caps.

Fig 4: Identifying Main Bearing Shells

Courtesy of BMW OF NORTH AMERICA, INC.

Bearing shell (1) with lubricating groove in crankcase

Installation:

The bearing shell classification for the relevant bearing position from 1 to 7 is stamped in the crankcase (2).

Y= yellow

G= green

V= violet

Fig 5: Identifying Lubricating Groove On Crankcase

Courtesy of BMW OF NORTH AMERICA, INC.

Install engine in reverse sequence to its removal.

Installation:

Replace all main crankshaft bearing shells. See 11 21 531 Replacing Crankshaft Main Bearing Shells (N73)

Replace all big-end bearing shells.