23 12 050 Replacing radial shaft seal for output flange (GS6-37BZ / DZ H-transmission)

Special tools required: 

See 23 MANUAL TRANSMISSION .

• 23 0 020 
• 23 2 320 
• 23 3 161 
• 23 3 162 
• 33 1 150 

Necessary preliminary tasks: 

• Remove exhaust system, see 18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (M54) .
• Support transmission, see 23 00 019 Removing and installing transmission (GS6-37BZ N52K) .
• Remove transmission cross-member, see 23 00 019 Removing and installing transmission (GS6-37BZ N52K) .
• Remove transmission bearing block, see 23 00 019 Removing and installing transmission (GS6-37BZ N52K) .
• Unflange propeller shaft  from transmission and tie up to one side

Brace output flange with special tool 23 0 020  .

Release collar nut with special tool 23 2 320  .

Installation: 

Mark flange with thermo pin and heat to min. 100°C.

Secure collar nut with Loctite 243.

• Loctite 243: BMW Parts Service.
  Fig 1: Special Tool 23 0 020 And 23 2 320

  Courtesy of BMW OF NORTH AMERICA, INC.
• Tightening torque: 23 21 1AZ, see 23 21 TRANSMISSION SHAFTS .

Detach output flange with special tool 33 1 150  from output shaft.

Fig 2: Special Tool 33 1 150

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw on special tool 23 3 161  .

Push special tool over output shaft and screw firmly into sealing ring.

Fig 3: Pushing Special Tool Over Output Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Insert screw into special tool again and continue turning until sealing ring is pulled out of transmission housing.

If necessary, remove Woodruff key of sealing ring.

Fig 4: Turning Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Coat sealing lips of new radial seal with gear oil.

Drive in radial seal as far as it will go with special tool 23 3 162  and plastic hammer.

Fig 5: Installing Radial Seal

Courtesy of BMW OF NORTH AMERICA, INC.