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

WARNING: This page is about a different variant/trim than selected.

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 pre-tensioned with a total of six special tools 11 4 461.

Necessary preliminary tasks:

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

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

Remove upper bearing strip (1).

Remove exhaust camshaft from lower bearing strip.

Fig 1: Lifting Lower And Upper Bearing Strips With Camshaft

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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/Intake Camshafts Marks

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Metal plain rectangular compression ring:

IMPORTANT: Plain 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: Pressing Plain 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).

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.

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 rocker arms (3) on cylinder no. 2 with spindle nut (2) of special tool 11 4 462.

Fig 6: Identifying Special Tools (11 4 463 And 11 4 462)

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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 Follower Seat

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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.

Fig 8: Identifying Lower Bearing Strip With Exhaust Camshaft And Cams

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

Fit upper bearing strip (1).

Insert bolts dry.

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

Fig 9: Lifting Lower And Upper Bearing Strips With Camshaft

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

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

Installation:

Upper and lower bearing strips 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 Bearing Strips

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NOTE: Schematic depiction of special tool 11 4 461 at upper bearing strip (1) and lower bearing strip (2).
Pre-tension 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 Screw, Upper And Lower Bearing Bank And Special Tool (11 4 461)

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Position special tool 11 4 461 over screw connection of bearing strips.

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

Fig 12: Identifying Upper Bearing Strip And Lower Bearing Strip

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

IMPORTANT: Tighten screws on thrust piece 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.
Pre-tension all special tools 11 4 461 with special tool 11 4 350 only.

Fig 14: Identifying Torque Wrench

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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 strip are easily accessible.

Fig 15: Identifying Cylinder Head Screw And Special Tools (11 4 350 And 11 4 461)

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Tighten upper and lower bearing strips 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: Tightening Lower/Upper Bearing Strips Using Special Tool (00 9 120)

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Assemble engine.