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

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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 And Gasket

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Installation note:

up until 1/2011

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) Onto Cylinder

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Installation note:

From 1/2011

Position special tool 2 409 248 on cylinder 2.

Hand-tighten special tool 2 409 248 with special tool 11 8 552 .

Fig 3: Positioning Special Tool (2 409 248) Onto Cylinder

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NOTE: Figure without bearing strip.

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

Fig 4: Locating Special Tool (11 7 100) Spindle Nuts

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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 5: Exhaust 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 6: 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 7: Identifying Exhaust And Intake Camshafts Marks

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Metal plain rectangular compression ring:

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

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

The plain rectangular compression rings have catches at the joint.

Fig 8: Locating Rectangular Compression Rings

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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.

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).

Fig 9: Inserting Plastic Rectangular Compression Ring Into Exhaust Camshaft Groove

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

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

Fig 10: Identifying Plastic Plain Rectangular Compression Rings

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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 11: Identifying Cam Follower 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.

Fig 12: Locating Special Tool (11 7 100) Spindle Nuts

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

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 13: Identifying Lower Bearing Strip, Exhaust Camshaft, Cams And Part Number

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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.

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

Fig 14: Locating Rectangular Compression Rings

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

NOTE: Intake camshaft figure.

Fig 15: Locating Intake And Exhaust Camshaft Code

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

Fig 16: Identifying Cam Position

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IMPORTANT: There must be no adhesive 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 17: Exhaust 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 18: Identifying Exhaust Camshaft Ground Surfaces

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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 19: Identifying Special Tool And 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 20: Positioning Special Tool (11 8 553) Over Bearing Strips Screw Connection

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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 21: Tightening Special Tool (11 8 553) Screw

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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 22: 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 23: Mounting/Positioning Special Tools

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

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Assemble engine.