11 31 028 Removing and installing/replacing exhaust camshaft (N52)

Special tools required: 

• 11 4 460 .
• 11 9 000 .
• 11 4 350 .
• 00 9 120 .

Necessary preliminary tasks: 

• Remove CYLINDER HEAD COVER .
• Check TIMING .
• Remove EXHAUST CAMSHAFT ADJUSTER .

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

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

Remove upper bearing strip (1).

Remove exhaust camshaft from lower bearing strip.

Fig 1: Removing Upper Bearing Strip

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Fig 2: Identifying Marks For Exhaust (A) And Intake (E) 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 3: Identifying 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).

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: 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 5: Identifying Plastic Plain Rectangular Compression Rings

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Installation bearing strip: 

Preassemble special tool 11 4 462 on 2nd cylinder.

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

Press down rocker arms (3) on 2nd cylinder with spindle nut (2) of special tool 11 4 462.

Fig 6: Pressing Down Rocker Arms

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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.

Refer to REMOVING AND INSTALLING/REPLACING ALL ROCKER ARMS .

Fig 7: Identifying Rocker Arm

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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 8: Identifying Lower Bearing Strip, Exhaust Camshaft, Part Number Location, And Cam Positions

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Fit upper bearing strip (1).

Insert bolts dry.

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

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

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

Fig 9: Removing Upper Bearing Strip

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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 thrust piece and shanks of special tools 11 4 461 rest on the milled surfaces.

Fig 10: Aligning Upper And Lower Bearing Strips At Ground Surfaces

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Fig 11: Schematic Diagram Of Special Tool (11 4 461) At Top Bearing Strip And Bottom Bearing Strip

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Position special tool 11 4 461 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 12: Positioning Special Tool 11 4 461 On Screw Connection Of Bearing Strips

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Position screw of special tool 11 4 461 on ground surfaces of top bearing strip (1) and bottom bearing strip (2).

Fig 13: Positioning Screw Of Special Tool 11 4 461 On Ground Surfaces

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Fig 14: Identifying Special Tool 11 4 350

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

On 2nd cylinder, fit special tool 11 4 461 with screw facing outwards.

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

Fig 15: Positioning Special Tools

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

Tightening torque 11 12 8AZ .

Fig 16: Tightening Upper And Lower Bearing Strips

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Assemble engine.