11 31 028 Removing and Installing/Replacing Exhaust Camshaft (N55)

Special Tools Required: 

• 00 9 120 .
• 11 4 350 .
• 11 4 461 .
• 11 7 100 .
• 11 8 550 .
• 11 8 552 .
• 11 8 553 .
• 11 9 000 .

Necessary Preliminary Tasks: 

• 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 Bushes and Gasket

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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 and Securing Using Special Tool 11 8 552

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Screw In Roller Cam Follower At 2Nd Cylinder To End Stop Using Spindle Nut of Special Tool 11 7 100 .

Fig 3: Screwing-In Roller Cam Follower To End Stop At 2Nd Cylinder Using Spindle Nut of Special Tool 11 7 100

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Release Screw Connection On Bearing Strip In Sequence From 15 To 1.

Remove Upper Bearing Strip (1).

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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Fig 6: Identifying Intake (E) and Exhaust (A) Identification Marks On Camshafts

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Metal Plain Rectangular Compression Ring: 

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 Remove Towards Front.

Make Sure Plain Rectangular Compression Rings (1) Can Move Freely.

Fig 7: Removing Plain Rectangular Compression Rings

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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 Exhaust Camshaft Groove and Rotating Into Position

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Check Plastic Plain Rectangular Compression Ring (1 and 2) for Freedom of Movement.

Fig 9: Identifying Plastic Plain Rectangular Compression Rings

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Installation Note: 

Before Mounting The Exhaust Camshaft, Make Sure That The Rocker Arm (1) Is Well Fitted and Pay Attention To The Hydraulic Valve Clearance Adjustment 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.

Press Down Rocker Arms (3) On Cylinder No. 2 with Spindle Nut (2) of Special Tool 11 7 100 .

Fig 11: Screwing-In Roller Cam Follower To End Stop At 2Nd Cylinder Using Spindle Nut of Special Tool 11 7 100

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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: Aligning/Positioning Camshaft, Bearing Strip, Cams, and Mounting Flats

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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 13: Identifying Plain Rectangular Compression Rings

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Insert Exhaust Camshaft So That The Data Code (1) On The Mounting Flats Faces Up.

Fig 14: Locating 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 Proper Position of Cam At Cylinder Number 6

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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 Proper Alignment of Upper and Lower Bearing Strips At Their Ground Surfaces

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Preload All Special Tools 11 8 553 with Special Tool 11 4 350 Only.

Fig 18: Preloading Special Tools 11 8 553 and Screw On Synchronizing Key

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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: Positioning Special Tool 11 8 553 Over Screw Connection of Bearing Strips

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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).

Fig 20: Tightening Screw of Special Tool 11 8 553 To Ground Surfaces of Upper and Lower Bearing Strips

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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 Tools 11 8 553 and Pre-Loading Using Special Tool 11 4 350

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Tighten Top and Bottom Bearing Strip with Special Tool 00 9 120 .

Tightening torque 11 31 1AZ .

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

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Assemble Engine.