Removing and installing/replacing exhaust camshaft (S55 engine)

Special tools required:

00 9 120
11 4 350
11 4 461
11 7 100
11 8 550
11 8 552
11 8 553
11 9 000
2 409 248
2 359 333

IMPORTANT: It is absolutely essential to follow an exact procedure for removing and installing the exhaust camshaft.
Risk of damage!
The upper and lower bearing strips must be preloaded with a total of six special tools 11 8 550.

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Remove all IGNITION COILS AND INJECTOR SHAFTS .
Remove EXHAUST CAMSHAFT ADJUSTER .
Remove SERVOMOTOR FOR ECCENTRIC SHAFT .

Position special tool 2 409 248 on cylinder 2.

Hand-tighten special tool 2 409 248 with special tool 2 359 333.

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Graphic without bearing strip.

Screw in roller cam follower at 2nd cylinder using spindle nut of special tool 2 409 248 to end stop.

Illustration shows N55

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw connection on bearing strip in sequence from 15 to 1.

Remove upper bearing strip (1).

NOTE: The upper and lower bearing strips (1) can also be lifted out completely with exhaust camshaft.
Illustration shows N55

Courtesy of BMW OF NORTH AMERICA, INC.

Remove exhaust camshaft (1) from bearing strip in direction of arrow.

Set down exhaust camshaft (1) on special tool.

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Marks of intake and exhaust camshafts are different.

Mixing up the intake and exhaust camshaft will result in engine damage .

A = Exhaust camshaft.

E = Intake camshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Plastic plain rectangular compression ring:

Installation note:

The plastic plain rectangular compression rings are maintenance-free and do not have to be replaced.

Insert plastic rectangular compression ring (1) into groove of exhaust camshaft (2) (see arrow in illustration).

Lightly oil plastic rectangular compression ring (1) and rotate in direction of arrow until compression ring (1) is positioned on the exhaust camshaft.

Courtesy of BMW OF NORTH AMERICA, INC.

Check the plastic plain rectangular compression rings (1 and 2) for freedom of movement.

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Removal on engine:
Set engine to ignition TDC at cylinder No. 1.
Removed cylinder head:
When using special tool 11 9 000, it will be necessary to remove the aluminium strip.

Installation note:

Before mounting the exhaust camshaft, ensure the correct fit of the rocker arm (1) on the hydraulic valve clearance compensating element and the valve.

See "Removing and installing/replacing all ROLLER CAM FOLLOWERS ".

Courtesy of BMW OF NORTH AMERICA, INC.

Mounting bearing strip:

Pre-install special tool 2 409 248 on cylinder no. 2.

IMPORTANT: Special tool 2 359 333 is a special screw.

Press down both rocker arms on cylinder no. 2 with spindle nut of special tool 2 409 248.

Illustration shows N55.

Courtesy of BMW OF NORTH AMERICA, INC.

Position lower bearing strip (1) with exhaust camshaft (2) on rocker arms.

Align exhaust camshaft (2).

Cylinder nos. 2 and 4 are at valve overlap.

Cams (3) on cylinder no. 1 point upwards at an angle.

Part number (4) on mounting flats of exhaust camshaft (2) points upwards.

Courtesy of BMW OF NORTH AMERICA, INC.

The cam (1) at cylinder 6 points downward at an angle.

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: There must be no adhesive residues in the cylinder head threaded holes.
Clean threaded holes .

Fit upper bearing strip (1).

Insert bolts dry.

Join exhaust camshaft to lower and upper bearing strips (1) with torque wrench (2) to 8 Nm in sequential order from 1 to 15.

Release all screws of upper bearing strip (1) from outside inwards by 90°.

Illustration shows N55.

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Upper and lower bearing strips must be aligned to each other at ground surfaces (1 and 2).

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Schematic diagram of special tool 11 8 553 at upper bearing strip (1) and lower bearing strip (2).
Preload all special tools 11 8 553 with special tool 11 4 350 only.

IMPORTANT: Tighten screw (3) on synchronizing key to 2 Nm. Risk of damage!

Courtesy of BMW OF NORTH AMERICA, INC.

Position special tool 11 8 553 over screw connection of bearing strips.

Make sure that the shanks rest exactly on the ground surfaces of the upper bearing strip (2) and lower bearing strip (1).

Courtesy of BMW OF NORTH AMERICA, INC.

Initially tighten screw of special tool 11 8 553 to ground surfaces of upper bearing strip (1) and lower bearing strip (2).

IMPORTANT: Tighten screws on synchronizing key to 2 Nm.
Risk of damage!

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Set special tool 11 8 553 to 2 Nm.
Preload all special tools 11 8 553 with special tool 11 4 350 only.

Courtesy of BMW OF NORTH AMERICA, INC.

Mount special tools 11 8 553 to inside of cylinder head with pressure bolt.

Mount special tool 11 8 553 on cylinder no. 2 with pressure bolt facing outward.

Position special tools 11 8 553 so that the screw connection of bearing strip is easily accessible.

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten top and bottom bearing strip with special tool 00 9 120.

Tightening torque 11 31 1AZ .

IMPORTANT: Remove special tool 11 8 553 only when exhaust camshaft screw connection is completed.

Adjust VALVE TIMING .

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.