1131028 Removing and installing/replacing exhaust camshaft (N51)

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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 pre-tensioned with a total of six special tools 11 4 461.

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Remove EXHAUST ADJUSTING UNIT for exhaust camshaft.
Adjust VALVE TIMING .

Release bearing cap screw connections from outside inwards.

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

Remove upper bearing strip (1).

Remove exhaust camshaft from lower bearing strip.

Fig 1: Removing Upper Bearing Strip

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IMPORTANT: Both camshafts have different identifications.
Mixing up the two camshafts will result in engine damage .
A Exhaust camshaft.
E Intake camshaft

Fig 2: Identifying Exhaust Camshaft And Intake Camshafts

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IMPORTANT: Plain compression rings (1) can easily break.
Plain compression rings (1) are engaged at joint.
Press plain compression rings (1) apart upwards and downwards and removed towards front.

Fig 3: Pressing Plain 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 DEVICE , it will be necessary to remove the aluminum profile insert.

Installing camshaft bearing strip

Pre-install special tool 11 4 462 on cylinder 2.

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

IMPORTANT: Special tool 11 4 463 is a special screw.

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

Fig 4: Identifying Special Tools (11 4 463 And 11 4 462)

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Installation:

Before installing exhaust camshaft, make sure roller rocker arm is correctly seated HVCA element and valve.

Refer to Removing and installing ROLLER ROCKER ARMS .

Fig 5: Identifying Roller Rocker Arm

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Position lower bearing strip (1) with exhaust camshaft (2) on roller rocker arms.

Align exhaust camshaft (2).

Cylinders 2 and 4 are at overlap.

Cams (3) on 1st cylinder point upwards at an angle.

Part number (4) on mounting flats points upwards.

Fig 6: Identifying Lower Bearing Strip With Exhaust Camshaft And Cams

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

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

Fig 7: Removing Upper Bearing Strip

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Installation:

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

Bring thrust piece and legs of special tools 11 4 461 into contact at milled surfaces.

Fig 8: Identifying Ground Surfaces For Aligning Lower And Upper Bearing Strips

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NOTE: Schematic depiction of special tool 11 4 461 at lower bearing strip (1) and upper bearing strip (2).
Pre-tension all special tools 11 4 461 with special tool 11 4 350 TORQUE WRENCH only.

IMPORTANT: Tighten screw (3) on thrust piece to 2 Nm (risk of damage).

Fig 9: Identifying Screw, Upper And Lower Bearing Bank And Special Tool (11 4 461)

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

Make sure that legs come into exact contact on ground surfaces, lower bearing strip (1) and upper bearing strip (2).

Fig 10: Identifying Special Tool (11 4 461)

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

IMPORTANT: Tighten screws on thrust piece to 2 Nm (risk of damage).

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

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IMPORTANT: Set special tool 11 4 350 TORQUE WRENCHto 2 Nm.
Pre-tension all special tools 11 4 461 with special tool 11 4 350 TORQUE WRENCH only.

Fig 12: Identifying Torque Wrench (11 4 350)

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

On cylinder no. 2 mount special tool 11 4 461 with screw (1) facing outwards.

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

Fig 13: Identifying Screw, Screw Connections And Special Tools (11 4 350 And 11 4 461)

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

Tightening torque: 11 31 1AZ .

Fig 14: Tightening Lower And Upper Bearing Strips Using Special Tool (00 9 120)

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IMPORTANT: Remove special tool 11 4 461 only when camshaft screw connection is completed.

Assemble engine.