11 31 028 Removing and installing/replacing exhaust camshaft (N55)

Special tools required:

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 preloaded with a total of six special tools 11 8 550 .

Necessary preliminary work:

Remove CYLINDER HEAD COVER .
Remove ALL IGNITION COILS AND INJECTOR SHAFTS .
Remove EXHAUST CAMSHAFT ADJUSTER
Adjust VALVE TIMING .

Remove fitting bushes (1).

Installation note:

Check fitting bushes (1) for damage and replace if necessary.

Fig 1: Identifying Fitting Bushes

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Position special tool 11 7 100 on cylinder 2.

Hand-tighten special tool 11 7 100 with special tool 11 8 552 .

Fig 2: Positioning Special Tool 11 7 100 On Cylinder 2

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NOTE: Graphic without bearing strip.

Screw in roller cam follower at 2nd cylinder using spindle nut of special tool 11 7 100 to end stop.

Fig 3: Attaching 2nd Cylinder Using Spindle Nut Of Special Tool 11 7 100 To End Stop

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Release screw connection on bearing strip in sequence from 15 to 1.

Remove upper bearing strip (1).

NOTE: The upper and lower bearing strips (1) can also be lifted out completely with exhaust camshaft.

Fig 4: Camshaft Bearing Strip Screws Tightening/Loosening Sequence

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Remove exhaust camshaft (1) from bearing strip in direction of arrow.

Set down exhaust camshaft (1) on special tool.

Fig 5: Removing Exhaust Camshaft From Bearing Strip

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IMPORTANT: Marks 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 6: Identifying Marks On Exhaust And Intake 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.

Fig 7: Adjusting Plain Rectangular Compression Rings

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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.

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 illustration).

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

Fig 8: Inserting Plastic Rectangular Compression Ring Into Groove Of Exhaust Camshaft

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Check plastic plain rectangular compression ring (1 and 2) for freedom of movement.

Fig 9: Identifying Plastic Plain Rectangular Compression Ring

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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 aluminium strip.

Installation note:

Before mounting the exhaust camshaft, ensure the correct fit of the rocker arm (1) on the hydraulic valve clearance compensating element and the valve.

See "REMOVING AND INSTALLING/REPLACING ALL ROLLER CAM FOLLOWERS ".

Fig 10: Identifying Rocker Arm

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Mounting bearing strip

Pre-install special tool 11 7 100 on cylinder no. 2.

IMPORTANT: Special tool 11 8 552 is a special screw.

Press down rocker arms (3) on cylinder no. 2 with spindle nut (2) of special tool 11 7 100 .

Fig 11: Pressing Down Rocker Arms On Cylinder No. 2 With Spindle Nut

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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 12: Positioning Lower Bearing Strip With Exhaust Camshaft On Rocker Arms

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Insert exhaust camshaft so that none of the latching mechanisms for the plain rectangular compression rings (1) point to a bearing cap joint.

Centre latch mechanism of the plain rectangular compression rings with the bearing cap.

Fig 13: Locating Rectangular Compression Rings

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Insert exhaust camshaft so that the data code (1) on the mounting flats faces up.

NOTE: Graphic of intake camshaft.

Fig 14: Identifying Part Numbers On Intake And Exhaust Camshafts

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The cam (1) at cylinder 6 points downward at an angle.

Fig 15: Identifying Cam Downward Angle

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IMPORTANT: There must be no oil residues in the cylinder head threaded holes.

Clean threaded holes.

Fit upper bearing strip (1).

Insert bolts dry.

Join exhaust camshaft to lower and upper bearing strips (1) with torque wrench (2) to 8 Nm in sequential order from 1 to 15.

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

Fig 16: Camshaft Bearing Strip Screws Tightening/Loosening Sequence

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Installation note:

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

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

Fig 17: Identifying Upper And Lower Bearing Strips

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

Preload all special tools 11 8 553 with special tool 11 4 350 only.

IMPORTANT: Tighten screw (3) on synchronizing key to 2 Nm. Risk of damage!

Fig 18: Preload All Special Tools (11 8 553) At Upper Bearing Strip And Lower Bearing Strip

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

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

Fig 19: Ensuring Shanks Rest Exactly On Bearing Strip Ground Surfaces

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

IMPORTANT: Tighten screws on synchronizing key to 2 Nm. Risk of damage!

Fig 20: Tightening Screw Of Special Tool 11 8 553 To Ground Surfaces Of Upper And Lower Bearing Strip

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

Fig 21: Identifying Special Tool 11 8 553

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Mount special tools 11 8 553 to inside of cylinder head with pressure bolt.

Mount special tool 11 8 553 on cylinder no. 2 with pressure bolt facing outward.

Position special tools 11 8 553 so that screw connections (2) of bearing strip are easily accessible.

Fig 22: Mounting Special Tool 11 8 553 On Cylinder No. 2

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Tighten top and bottom bearing strip with special tool 00 9 120 .

Tightening torque 11 31 1AZ .

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

Fig 23: Tightening Top And Bottom Bearing Strip Using Special Tool 00 9 120

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Assemble engine.