11 31 025 Removing And Installing/Replacing Inlet Camshaft (N51)

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Special tools required:

For the following special tools, refer to ENGINE - SPECIAL TOOLS (N51) .

11 4 281
11 4 481

IMPORTANT: Aluminum-magnesium materials. No steel screws/bolts may be used due to the threat of electrochemical corrosion. A magnesium crankcase requires aluminum screws/bolts exclusively. Aluminum screws/bolts must be replaced each time they are released . Aluminum screws/bolts are permitted with and without color coding (blue). For reliable identification: Aluminum screws/bolts are not magnetic . Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

Remove cylinder head cover . See 11 12 000 REMOVING AND INSTALLING OR SEALING CYLINDER HEAD COVER (N51) .
Remove adjusting unit for inlet camshaft. See 11 36 046 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS (N51) .
Remove intermediate lever . See 11 37 010 REMOVING AND INSTALLING/REPLACING INTERMEDIATE LEVER (N51) .
Adjust valve timing . See 11 31 505 ADJUSTING CAMSHAFT TIMING (N51) .

Bearing cap (1) is a thrust bearing.

Release screws of bearing caps (1 and 2).

Set all bearing caps down in Placement boards (special tool 11 4 481) in a tidy and orderly fashion.

All bearing caps are identified from 1 to 6.

Tightening torque. See 11 31 1AZ in 11 31 CAMSHAFT .

Fig 1: Identifying Screws Of Bearing Caps

G04751158

Courtesy of BMW OF NORTH AMERICA, INC.

Lift out camshaft (2).

Installation:

Clean all bearing points and lubricate with oil.

Check plain compression rings (1) for damage and replace if necessary.

Fig 2: Checking Plain Compression Rings

G04751159

Courtesy of BMW OF NORTH AMERICA, INC.

If necessary, replace plain compression rings (1).

The plain compression rings have catches at the joint.

Press plain compression rings (1) apart upwards and downwards and removed towards front.

IMPORTANT: Plain compression rings (1) can easily break.

Fig 3: Identifying Plain Compression Rings

G04739815

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Both camshafts have different identifications.
Mixing up the two camshafts will result in engine damage .

A Exhaust camshaft.

E Inlet camshaft

Fig 4: Identifying Exhaust Camshaft And Inlet Camshaft

G04751161

Courtesy of BMW OF NORTH AMERICA, INC.

Insert camshaft (1) so that part number on twin surface points upwards.

Position inlet camshaft (1) so that cams point upwards at an angle.

Attach special tool 11 4 281 to twin surface. See Fig 5.

Fig 5: Identifying Camshaft

G04751154

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.