11 31 028 Removing and installing/replacing exhaust camshaft (N54/N54T)

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 preloaded with a total of six special tools 11 8 553.

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER
Remove EXHAUST 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: Graphic shows N52.

Fig 1: Lifting Lower And Upper Bearing Strips With Camshaft

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IMPORTANT: Both camshafts have different markings.

Mixing up the two camshafts will result in engine damage.

A Exhaust camshaft.

E Intake camshaft

Fig 2: Identifying Exhaust And Inlet Camshaft

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Plain compression rings (1) are engaged at joint.

Press plain compression rings (1) apart upwards and downwards and removed towards front.

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

Fig 3: Pressing Plain Compression Rings

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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.

Installation note:

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

Fig 4: Identifying Cam Follower Seat

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Installing camshaft bearing strip

Pre-install special tool 11 8 551 on cylinder no. 2.

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 cylinder no. 2 with spindle nut of special tool 11 8 551.

Fig 5: Identifying Special Tools 11 8 551 And 11 8 552

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Lay lower bearing strip (1) on cylinder head.

Installation note:

Lubricate all bearing points with engine oil.

Fig 6: 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 7: Identifying Exhaust Camshaft In Lower Bearing Bank

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

Fig 8: Identifying Installation Position Of Exhaust Camshaft

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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 9: Identifying Exhaust Camshaft Position And Cam Follower

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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 Bearing Strips

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

IMPORTANT: Tighten screw (3) on thrust piece to 2 Nm.

Fig 11: Identifying Special Tool 11 8 553 Schematic Depiction On Bearing Strips

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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 12: Positioning Special Tool 11 8 553 Over Bearing Banks Screw Connection

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

IMPORTANT: Tighten screws on thrust piece to 2 Nm.

Fig 13: Tightening Special Tool 11 8 553 Screw

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IMPORTANT: Set special tool 11 4 350 to 2 Nm.

Pre-tension all special tools 11 8 553 with special tool 11 4 350 only.

Fig 14: Identifying 11 4 350 Torque Wrench

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

On cylinder no. 2 mount 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 15: Identifying Special Tools 11 8 553 And Special Tool 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: Remove special tool 11 8 553 only when camshaft screw connection is completed .

Fig 16: Tightening Bearing Strips Using Special Tool 00 9 120

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Assemble engine.