11 31 028 Removing and installing/replacing exhaust camshaft (N52K)

Special tools required:

11 4 460
11 9 000
11 4 350
00 9 120

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 banks must be tensioned with a total of six special tools 11 4 461 .

Necessary preliminary tasks:

Remove cylinder head cover
Remove exhaust adjustment unit
Adjust VALVE TIMING

The screw connection of the bearing banks must be released from the outside inwards.

Lift out upper and lower bearing banks (1) with exhaust camshaft.

Remove upper bearing bank (1).

Remove exhaust camshaft from lower bearing bank.

Fig 1: Identifying Upper And Lower Bearing Banks

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Markings of inlet and exhaust camshafts are different.
Mixing up the inlet and exhaust camshaft will result in engine damage .
A - Exhaust camshaft.
E- Inlet camshaft

Fig 2: Identifying Exhaust Camshaft And Inlet Camshaft

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Metal plain rectangular compression ring:

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

Only replace plain rectangular compression rings (1) when they are broken. The plain rectangular compression rings have catches at the joint. Press plain rectangular compression rings (1) apart upwards and downwards and removed towards front. Make sure plain rectangular compression rings (1) can move freely.

Installation note: When exhaust camshafts are inserted, no joint must point to a separating joint.

Fig 3: Identifying Compression Ring

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Plastic plain rectangular compression ring:

Installation note: The plastic plain rectangular compression ring is maintenance free and does not have to be replaced.

Insert plastic rectangular compression ring (1) into groove of exhaust camshaft (2) (see arrow). Lightly oil plastic rectangular compression ring (1) and rotate in direction of arrow until compression ring (1) is positioned on the exhaust camshaft.

Fig 4: Installing Plastic Plain Rectangular Compression Ring

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

Fig 5: Checking Ring For Freedom Of Movement

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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 aluminum strip.

Installation bearing strip:

Pre-install special tool 11 4 462 on cylinder no. 2.

Insert special tool 11 4 463 in screw connection of cylinder head cover.

IMPORTANT: Special tool 11 4 463 is a special screw.

Press down cam followers (3) on cylinder no. 2 with spindle nut (2) of special tool 11 4 462 .

Fig 6: Identifying Cam Followers And Cylinder No. 2 With Spindle Nut

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Installation:

Before mounting the exhaust camshaft on the correct cam follower seat (1), pay attention to the hydraulic valve clearance adjustment element and the valve.

Refer to REMOVING AND INSTALLING/REPLACING ALL CAM FOLLOWERS .

Fig 7: Identifying Cam Followers

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Position lower bearing bank (1) with exhaust camshaft (2) cam followers.

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 twin surface of exhaust camshaft (2) points upwards.

Fig 8: Identifying Lower Bearing Bank, Exhaust Camshaft And Cams

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

Fit upper bearing bank (1).

Insert bolts dry.

Tension down upper bearing bank (1) with exhaust camshaft at bearing points 3 and 5 through a 1/2 bolt turn.

Join exhaust camshaft to upper and lower bearing banks (1) with torque wrench (2) from inside outwards to 8 Nm.

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

Fig 9: Identifying Upper And Lower Bearing Banks

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Installation:

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

Make sure that the thrust piece and the legs of special tools 11 4 461 rest on the milled surfaces.

Fig 10: Identifying Ground Surfaces

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NOTE: Schematic depiction of special tool 11 4 461 at upper bearing bank (1) and lower bearing bank (2).
Pretension all special tools 11 4 461 with special tool 11 4 350 only.

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

Fig 11: Identifying Upper Bearing Bank And Lower Bearing Bank

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Position special tool 114 461 over screw connection of bearing banks.

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

Fig 12: Identifying Upper Bearing Bank And Lower Bearing Bank

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Initially tighten screw of special tool 11 4 461 to ground surfaces of upper bearing bank (1) and lower bearing bank (2).

IMPORTANT: Tighten screws on thrust piece to 2 Nm. Risk of damage!

Fig 13: Identifying Upper Bearing Bank And Lower Bearing Bank

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IMPORTANT: Set special tool 11 4 350 to 2 Nm.
Pretension all special tools 11 4 461 with special tool 11 4 350 only.

Fig 14: Identifying Set Special Tool 11 4 350

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Mount special tools 11 4 461 with screw (1) to inside of cylinder head.

Mount special tool 11 4 461 with screw facing outwards on cylinder no. 2.

Position special tools 11 4 461 so that screw connections (2) of bearing bank are easily accessible.

Fig 15: Identifying Screw Connections And Screw

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Tighten upper and lower bearing banks with special tool 00 9 120 .

Tightening torque 11 31 1AZ .

IMPORTANT: Remove special tool 11 4 461 only when exhaust camshaft screw connection is completed .

Fig 16: Identifying Special Tool 11 4 461 And 00 9 120

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Assemble engine.