11 31 028 Removing and installing/replacing exhaust camshaft (N54)

Special tools required:

IMPORTANT: Risk of damage!
It is absolutely essential to follow an exact procedure for removing and installing the exhaust camshaft.
Top and bottom bearing strips must be pre-tensioned with a total of six special tools 11 8 553 .

NOTE: Special tools 11 8 551 , 11 8 552 and 11 8 553 are included in set of special tools 11 8 550 .

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER
Remove ADJUSTING UNIT for exhaust camshaft.
Adjust VALVE TIMING

Release bearing cap screw connections from outside inwards.

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

NOTE: Illustration shows N52 engine.

Fig 1: Identifying Lower/Upper Bearing Strips

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IMPORTANT: Both camshafts have different markings.
Mixing up the two camshafts will result in damage.

A Exhaust camshaft.

E Intake camshaft

Fig 2: Identifying Camshafts Markings

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Metal plain rectangular compression ring:

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

Fig 3: Identifying Plain Compression Rings

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Only replace plain rectangular compression rings (1) when they are broken.

The plain rectangular compression rings have catches at the joint.

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

Illustration shows 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 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: Inserting Plastic Rectangular Compression Ring Into Exhaust Camshaft Groove

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

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 aluminium strip.

Installation note:

Before installation of exhaust camshaft, make sure roller cam follower is correctly fitted on hydraulic valve clearance compensating element and valve!

Fig 5: Identifying Roller Cam Follower

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Installing camshaft bearing strip:

Preassemble special tool 11 8 551 on 2nd cylinder.

Observe markings E and A

E: Intake side

A: Exhaust side

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

Press down roller cam follower (1) on 2nd cylinder with spindle nut of special tool 11 8 551 .

Fig 6: Inserting Special Tool (11 8 552) In Screw Connection Of Cylinder Head Cover

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Lay lower bearing strip (1) on cylinder head.

Installation note:

Lubricate all bearing positions with engine oil.

Fig 7: Identifying Lower Bearing Strip On Cylinder Head

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Insert exhaust camshaft (1) in lower bearing strip.

Installation note:

Lubricate all bearing positions and cams with engine oil.

Fig 8: Identifying Exhaust Camshaft In Lower Bearing Strip

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Installation position (1) of exhaust camshaft (2) at cylinder no. 1.

Fig 9: Identifying Installation Position Of Exhaust Camshaft At Cylinder No. 1

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

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

Check position of exhaust camshaft (2) at cylinder no. 6.

Roller cam follower (1) is not actuated.

Fig 10: Identifying Roller Cam Follower And Position Of Exhaust Camshaft At Cylinder No. 6

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Installation note:

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

Fig 11: Identifying Ground Surfaces Of Upper And Lower Bearing Strips

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

NOTE: Schematic diagram of special tool 11 8 553 at top bearing strip (2) and bottom bearing strip (1).

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

Fig 12: Special Tool (11 8 553) At Upper/Lower Bearing Strip - Schematic Diagram

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

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

Fig 13: Positioning Special Tool (11 8 553) Into Screw Connection Of Bearing Strips

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Position screw of special tool 11 8 553 on ground surfaces of bottom bearing strip (2) and top bearing strip (1).

IMPORTANT: Tighten screws on synchronizing key to 2 Nm.

Fig 14: Tightening Screw Of Special Tool (11 8 553) To Ground Surfaces Of Bearing Strip

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

Fig 15: Identifying Special Tool (11 4 350)

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Fit special tools 11 8 553 with screw (1) to the inside of the cylinder head.

On 2nd cylinder fit special tool 11 8 553 with screw (1) facing outwards.

Position special tools 11 4 350 so that screw connections (2) of bearing strip are easily accessible.

Fig 16: Identifying Special Tools (11 8 553) And (11 4 350)

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

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

Tightening torque 11 31 1AZ .

IMPORTANT: Only remove special tool 11 8 553 when camshaft screw connection is completed .

Fig 17: Tightening Bearing Strips Using Special Tool (00 9 120)

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Assemble engine.