11 31 028 Removing And Installing/Replacing Exhaust Camshaft (N52K)

Special tools required: 

For the following special tools, refer to MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS -- 128I .

• 00 9 120 

For the following special tools, refer to ENGINE- SPECIAL TOOLS (N52K) .

• 11 4 350 
• 11 4 461 
• 11 4 462 
• 11 4 463 
• 11 9 000 

Necessary preliminary tasks: 

• Remove cylinder head cover  . See 11 12 000 REMOVING AND INSTALLING OR SEALING CYLINDER HEAD COVER (N52K) .
• Remove exhaust adjustment unit  . See 11 36 046 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS (N52) .
• Adjust valve timing  . See 11 31 505 ADJUSTING TIMING OF CAMSHAFT(S) (N52K) .

The screw connection of the bearing banks must be released from the outside inwards.

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

Remove upper bearing bank (1).

Remove exhaust camshaft from lower bearing bank.

Fig 1: Removing Upper Bearing Bank

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Fig 2: Identifying Exhaust Camshaft And Inlet Camshaft

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Metal plain rectangular compression ring: 

Check plain compression rings (1) for damage and replace if necessary.

Plain compression rings (1) are engaged at joint.

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

Fig 3: Identifying Compression Rings

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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: Installing Plastic Plain Rectangular Compression Ring

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

Fig 5: Checking Ring For Freedom Of Movement

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Mounting bearing strip: 

Pre-install special tool 11 4 462 on cylinder no. 2.

Insert special tool 11 4 463 in screw connection of cylinder head cover.

Press down cam followers (3) on cylinder no. 2 with spindle nut (2) of special tool 11 4 462.

Fig 6: Identifying Cam Followers And Spindle Nut With Special Tools (11 4 463 And 11 4 462)

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Installation: 

Before mounting the exhaust camshaft on the correct cam follower seat (1), pay attention to the hydraulic valve clearance adjustment element and the valve.

Refer to 11 33 050 REMOVING AND INSTALLING/REPLACING ALL ROCKER ARMS (N52K) .

Fig 7: Identifying Cam Follower Seat

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Position lower bearing bank (1) with exhaust camshaft (2) cam followers.

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 twin surface of exhaust camshaft (2) points upwards.

Fig 8: Identifying Lower Bearing Bank, Exhaust Camshaft And Cam

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Fig 9: Removing Upper Bearing Bank

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Fit upper bearing bank (1).

Insert bolts dry.

Tension down upper bearing bank (1) with exhaust camshaft at bearing points 3 and 5 through a 1/2 bolt turn.

Join exhaust camshaft to upper and lower bearing banks (1) with torque wrench (2) from inside outwards to 8 Nm. 

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

Installation: 

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

Make sure that the thrust piece and the legs of special tools 11 4 461 rest on the milled surfaces.

Fig 10: Identifying Bearing Banks

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Fig 11: Identifying Screw, Upper And Lower Bearing Bank With Special Tool (11 4 461)

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Position special tool 11 4 461 over screw connection of bearing banks.

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

Fig 12: Identifying Upper And Lower Bearing Bank With Special Tool (11 4 461)

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Initially tighten screw of special tool 11 4 461 to ground surfaces of upper bearing bank (1) and lower bearing bank (2).

Fig 13: Tightening Screw Of Special Tool 11 4 461 To Ground Surfaces

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Fig 14: Identifying Special Tools 11 4 461

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Mount special tools 11 4 461 with screw (1) to inside of cylinder head.

Mount special tool 11 4 461 with screw facing outwards on cylinder no. 2.

Position special tools 11 4 461 so that screw connections (2) of bearing bank are easily accessible.

Fig 15: Identifying Screws With Special Tools (11 4 350 And 11 4 461)

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

Tightening torque. See 11 31 1AZ in 11 31 CAMSHAFT .

Fig 16: Identifying Special Tools (00 9 120 And 11 4 461)

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Assemble engine.