11 37 005 Removing and installing/replacing eccentric shaft (N55)

Special tools required:

11 4 481 .

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Remove SERVOMOTOR FOR ECCENTRIC SHAFT DRIVE .
Remove INTERMEDIATE LEVER .

NOTE: All bearing caps (1) of eccentric shaft are marked with numbers from 1 to 6 (1 for 1st cylinder to 6 for 6th cylinder).

Release screws on bearing caps 1 to 6 (1).

Set all bearing caps down in special tool 11 4 481 in a neat and orderly fashion.

Remove eccentric shaft with gentle tilting and rotational movement.

Place eccentric shaft on special tool 11 4 481 .

Fig 1: Eccentric Shaft Bearing Cap Number Marking

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Needle bearings (1) can break very easily.

Fig 2: Identifying Needle Bearings

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Replace eccentric shaft.

Carefully pull needle bearing (2) apart at point of separation.

Slide on all needle bearings (1) of eccentric shaft.

Install bearing shells (1) as illustrated.

NOTE: If bearing shells need to be replaced due to a defect, always replace bearing shells (1) and needle bearings together.

Fig 3: Identifying Bearing Shells Of Needle Bearings

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Any installation position may be selected for bearing shells (1 and 2).

If bearing shells (1) in cylinder head are inserted with tips pointing downward, the bearing shells (2) must be inserted in the opposite direction in the bearing cap (see example in illustration).

Fig 4: Installing Bearing Shells

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

All bearing caps (1) of eccentric shaft are marked with numbers from 1 to 6 (1 for 1st cylinder to 6 for 6th cylinder).

Insert eccentric shaft.

Coat all bearing positions with engine oil.

Put on all bearing caps (1) according to cylinder assignment.

Fig 5: Eccentric Shaft Bearing Cap Number Marking

Courtesy of BMW OF NORTH AMERICA, INC.

Insert all screws.

Tightening torque 11 31 2AZ .

Installation note:

Gearing of eccentric shaft must be greased with LONGTIME PD 1 (2.4) .

Check intermediate shaft for ease of movement.

Assemble engine.