11 37 005 Removing and installing/replacing eccentric shaft (N20, N26)

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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 of the eccentric shaft are identified with numbers from 1 to 4.

Release screws on bearing cap 1 to 4.

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

Remove eccentric shaft with gentle tilting and swivel motion.

Place eccentric shaft on special tool 11 4 481 .

Fig 1: Screws On Bearing Cap

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

Installation note:

Replace eccentric shaft.

Carefully pull needle bearing (1) apart at point of separation.

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

Fig 2: Needle Bearing

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Install bearing shells (1) as pictured.

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

Fig 3: Bearing Shells Ends

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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 Fig 4).

Fig 4: Bearing Shell Tip

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Installation note:

The gearing and the guide bearing lateral to the eccentric shaft must be greased with LONGTIME PD 1 (4.1) .

All bearing caps of the eccentric shaft are identified with numbers from 1 to 4.

Coat all bearing positions with engine oil.

Fig 5: Eccentric Shaft Bearing Caps

Courtesy of BMW OF NORTH AMERICA, INC.

Insert eccentric shaft.

Place on all bearing caps according to arrangement.

Insert all screws.

Tightening torque: 11 31 2AZ .

Check intermediate shaft for ease of movement.

Assemble engine.