Replacing front crankshaft seal

Preliminary work 

• Refer to REMOVING THE TOP LEFT COVER IN THE ENGINE COMPARTMENT and REMOVE THE TOP RIGHT COVER IN THE ENGINE COMPARTMENT .
• Refer to REMOVING THE ACOUSTIC COVER .
• Refer to REMOVING UPPER CROSS CONNECTION .
• Refer to REMOVING THE FRONT-END STRUT .
• Refer to REMOVING THE REAR TOP CROSS CONNECTION .
• Refer to REMOVING THE INTAKE FILTER HOUSING ON THE LEFT .
• Refer to REMOVING THE LEFT UNFILTERED-AIR DUCT .
• Refer to REMOVING THE FAN COWL .
• Refer to REMOVING DRIVE BELT .
• Refer to REMOVING THE BELT PULLEY ON THE TORSIONAL VIBRATION DAMPER .
• Refer to REMOVING THE VIBRATION DAMPER .

• Make sure that the grooves of the rotating arms (2) on the special tool 0 493 923 (11 9 410)  to insert in the radial shaft seal (1) are at 90° angle to the spindle (3).
• Insert the special tool.

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• Make sure that the grooves of the rotating arms (2) on the special tool 0 493 923 (11 9 410)  to pull out the radial shaft seal (1) are at the spindle (3).
• Turn the spindle clockwise (arrow direction).
  NOTE: Protect the special tool from falling.
• Remove the radial shaft seal (1).
• Clean the contact surface of the crankshaft seal (1).

  Courtesy of BMW OF NORTH AMERICA, INC.

• Replace radial shaft seal (1) at front.

  Parts:  Radial shaft seal

• Position the radial shaft seal (1).
• Set and join the special tool 2 0 493 924 (11 9 420)  with the central bolt (3).
• Use the special tool (2) 0 493 924 (11 9 420)  and the central bolt (3) to screw in the radial shaft seal (1) flush.

  Courtesy of BMW OF NORTH AMERICA, INC.

• Unscrew the central bolt (2) counter-clockwise.
• Remove the special tool (1) 0 493 924 (11 9 420). 

  Courtesy of BMW OF NORTH AMERICA, INC.

• The Woodruff key (1) must be in the crankshaft (3) and the sprocket (2) must be secured from twisting.

  If the Woodruff key (1) is missing, it must be replaced and then the valve timings must be set. 

Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work 

• Refer to INSTALLING THE VIBRATION DAMPER .
• Refer to INSTALLING THE BELT PULLEY ON THE TORSIONAL VIBRATION DAMPER .
• Refer to INSTALL DRIVE BELT .
• Refer to INSTALLING FAN COWL .
• Refer to INSTALLING THE LEFT UNFILTERED-AIR DUCT .
• Refer to INSTALLING LEFT INTAKE SILENCER HOUSING .
• Refer to INSTALLING ACOUSTIC COVER .
• Refer to INSTALLING THE REAR TOP CROSS CONNECTION .
• Refer to INSTALLING THE FRONT-END STRUT .
• Refer to INSTALLING UPPER CROSS CONNECTION .
• Refer to INSTALLING THE COVER IN THE ENGINE COMPARTMENT AT TOP LEFT and INSTALL THE COVER IN THE ENGINE COMPARTMENT ON THE TOP RIGHT .