11 31 025 Removing and installing/replacing intake camshaft (N54/N54T)

Special tools required:

IMPORTANT: Risk of damage!
It is absolutely essential to follow an exact procedure for removing and installing the exhaust camshaft.
The upper and lower bearing strips must be pre-tensioned with a total of six special tools 11 8 553 .
Special tool 11 8 550 can be used for intake and exhaust sides.

Necessary preliminary tasks

Remove CYLINDER HEAD COVER .
Remove INTAKE ADJUSTER of intake camshaft.

Release bearing cap screw connections from outside inwards.

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

NOTE: Graphic shows N52.

Fig 1: Lifting Out Camshaft Lower And Upper Bearing Strips

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Remove upper bearing shell.

Remove intake camshaft (1) marked with (E).

Fig 2: Identifying Intake Camshaft

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IMPORTANT: Both camshafts have different markings
Mixing up the two camshafts will result damage.
A Exhaust camshaft
E Intake camshaft

Fig 3: Identifying Camshafts Markings

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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.

Fig 4: Pressing Plain Rectangular Compression Ring

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Press the plain rectangular compression rings (1) apart forwards and towards the rear and remove towards the front.

Make sure plain rectangular compression rings (1) can move freely.

Installation note:

When intake camshafts are inserted, no joint must point to a separating joint.

Graphic N12 engine

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 plain rectangular compression ring (1) into groove of intake camshaft (2) (see arrow).

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

Make sure plain rectangular compression ring (1) can move freely.

Fig 5: Inserting Plastic Rectangular Compression Ring Into Intake Camshaft Groove

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IMPORTANT: Removal on engine:
Engine at cylinder no. 1 firing TDC position.
Removed cylinder head:
When using special tool 11 9 000 , it will be necessary to remove the aluminum strip.

Installing camshaft bearing strip

Pre-install special tool 11 8 551 on cylinder nos. 2 and 3.

Insert special tool 11 8 552 in screw connection of cylinder head cover.

Special tool 11 8 551 is marked with letters E and A.

E = Intake side

A = Exhaust side

Press down roller cam follower on cylinder no. 3 with spindle nut (2) of special tool 11 8 551 .

Fig 6: Installing Camshaft Bearing Strip

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Installation note:

Before installing intake camshaft, make sure roller cam follower is correctly seated on hydraulic valve clearance compensating element and valve.

Fig 7: Identifying Roller Cam Follower

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Installation note:

Pre-install bearing strip of intake camshaft.

Lubricate all bearing points in lower bearing strip with engine oil.

Installation note:

Lay intake camshaft (1) in bearing strip.

Fig 8: Identifying Intake Camshaft

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Rotate intake camshaft (1) at cylinder no. 1 into position (2).

Fig 9: Identifying Intake Camshaft Position

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Installation note:

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

Bring thrust piece and legs of special tools 11 8 553 into contact at milled surfaces.

Fig 10: Identifying Upper And Lower Bearing Strips Ground Surfaces

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NOTE: Schematic depiction of special tool 11 8 553 at lower bearing strip (1) and upper bearing strip (2).

IMPORTANT: Tighten screw (3) on synchronizing key to 2 Nm.

Fig 11: Identifying Special Tool (11 8 553)

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

Make sure that legs come into exact contact on ground surfaces, lower bearing strip (1) and upper bearing strip (2).

Fig 12: Positioning Special Tool (11 8 553)

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

IMPORTANT: Tighten screws on thrust piece to 2 Nm.

Fig 13: Tightening Special Tool Screw (11 8 553)

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

Fig 14: Identifying Special Tool (11 4 350)

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Install upper and lower bearing strips (1).

Pre-install all special tools 11 8 553 .

IMPORTANT: Secure special tool 11 8 553 to max. 2 Nm.

Fig 15: Identifying Upper And Lower Bearing Strips

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Install intake camshaft with bearing strips (1) on cylinder head.

Fig 16: Identifying Intake Camshaft Bearing Strips

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Check position of intake camshaft (1) at cylinder no. 6.

Roller cam follower (2) is not actuated.

Fig 17: Identifying Intake Camshaft And Cam Follower

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

Tightening torque: 11 31 1AZ .

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

Fig 18: Tightening Lower And Upper Bearing Strips Using Special Tool

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Adjust VALVE TIMING .

Assemble engine.