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

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:

Release bearing cap screw connections from 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: Removing Upper Bearing Bank

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IMPORTANT: Markings 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

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 Rings

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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 in Fig 4). 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 firing TDC at 1st cylinder.
Removed cylinder head:
When using special tool 11 9 000, it will be necessary to remove the aluminum profile insert.

Mounting 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 Spindle Nut With Special Tools (11 4 463 And 11 4 462)

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Installation note:

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 ROCKER ARMS (N52K) .

Fig 7: Identifying Cam Follower Seat

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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 Cam

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IMPORTANT: There must be no adhesive residues in the cylinder head tapped holes.
Clean threaded 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: Removing Upper Bearing Bank

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Installation note:

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

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

Fig 10: Identifying Bearing Banks

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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 synchronizing key to 2 Nm (risk of damage)

Fig 11: Identifying Screw, Upper And Lower Bearing Bank With Special Tool (11 4 461)

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Position special tool 11 4 461 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 And Lower Bearing Bank With Special Tool (11 4 461)

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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 synchronizing key to 2 Nm (risk of damage)

Fig 13: Tightening Screw Of Special Tool 11 4 461 To Ground Surfaces

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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 Special Tools 11 4 461

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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 Screws With Special Tools (11 4 350 And 11 4 461)

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

NOTE: Insert screws dry.
Tighten screws from inside outwards.
Jointing torque and angle of rotation must be observed without fail.

Jointing torque: 8 Nm ; Angle of rotation: 60°

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

Fig 16: Identifying Special Tools (00 9 120 And 11 4 461)

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Assemble engine.