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

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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. Refer to 11 00 050 REMOVING AND INSTALLING ENGINE (N73) .
Remove left cylinder head. Refer to 11 12 105 REMOVING AND INSTALLING LEFT CYLINDER HEAD (N73) .
Remove right cylinder head. Refer to 11 12 106 REMOVING AND INSTALLING RIGHT CYLINDER HEAD (N73) .
Remove hub for vibration damper. Refer to 11 23 031 REMOVING AND INSTALLING/REPLACING VIBRATION DAMPER HUB (N73) .
Remove lower timing case cover. Refer to 11 14 110 REMOVING AND INSTALLING LOWER TIMING CASE COVER (N73) .
Remove rear timing case cover.
Remove upper oil sump. Refer to 11 13 010 REMOVING AND INSTALLING/REPLACING OIL SUMP TOP SECTION (N73) .
Remove oil pump. Refer to 11 41 000 REMOVING AND INSTALLING/REPLACING OIL PUMP (N73) .
Remove flywheel. Refer to 11 22 510 REMOVING AND INSTALLING/REPLACING FLYWHEEL (N73) .
Remove all pistons. Refer to 11 25 530 REMOVING AND INSTALLING/REPLACING ALL PISTONS (N73) .

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

Installation:

Tightening torque, refer to 11 11 3AZ in ENGINE - TIGHTENING TORQUES .

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

Installation:

Tightening torque, refer to 11 11 3AZ in ENGINE - TIGHTENING TORQUES .

Release main bearing bolts along lines (3).

Installation:

Tightening torque, refer to 11 11 2AZ in ENGINE - TIGHTENING TORQUES .

Remove main bearing caps 1 to 7.

Fig 1: Releasing Main Bearing Bolts

G03291852

Courtesy of BMW OF NORTH AMERICA, INC.

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

Lift out crankshaft (2).

Fig 2: Locating Guide Bearing

G03291853

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew thread support bushings in main bearing caps.

Fig 3: Releasing Thread Support Bushings In Main Bearing Caps

G03291854

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 Types Of Main Bearing Shells

G03291855

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: Locating Bearing Shell With Lubricating Groove In Crankcase

G03291856

Courtesy of BMW OF NORTH AMERICA, INC.

Install engine in reverse sequence to its removal.

Installation:

Replace all main crankshaft bearing shells. Refer to 11 21 531 REPLACING CRANKSHAFT MAIN BEARING SHELLS N73) .

Replace all big-end bearing shells.