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

Special tools required:

00 9 120
11 4 350
11 4 461
11 4 462
11 4 463
11 9 000

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 banks must be pretensioned 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 banks (1) with camshaft.

Remove upper bearing bank (1).

Remove exhaust camshaft from lower bearing bank.

Fig 1: Identifying Upper Bearing Bank

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IMPORTANT: Both camshafts have different identifications.

Mixing up the two camshafts will result in engine damage.

A Exhaust camshaft.

E Inlet camshaft.

Fig 2: Identifying Exhaust Camshaft And Inlet Camshaft

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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.

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

Fig 3: Identifying Plain Compression Rings

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IMPORTANT: Removal on engine:

Set engine to firing TDC at 1st cylinder.

Removed cylinder head:

When using special tool 11 9 000, it will be necessary to remove the aluminium profile insert.

Installing camshaft bearing bank:

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), (11 4 462), Roller Rocker Arms And Cylinder

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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 Rocker Arms Position

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Position lower bearing bank (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 dihedron points upwards.

Fig 6: Identifying Lower Bearing Bank, Camshaft, Exhaust Camshaft, Cams And Part Number

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

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

Fig 7: Identifying Lower, Upper Bearing Banks And Torque Wrench

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Installation:

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

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

Fig 8: Aligning Mark Of Lower Bearing Bank And Upper Bearing Banks

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NOTE: Schematic depiction of special tool 11 4 461 at lower bearing bank (1) and upper bearing bank (2).

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

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

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

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

Fig 10: Identifying Special Tool (11 4 461, Lower Bearing Bank And Upper Bearing Bank)

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

IMPORTANT: Tighten screws on thrust piece to 2 Nm.

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

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IMPORTANT: Set special tool 11 4 350 to 2 Nm.

Pretension all special tools 11 4 461 with special tool 11 4 350 only.

Fig 12: Identifying Torque Wrench

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

On cylinder 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 bank are easily accessible.

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

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

For tightening torque refer to 11 31 1AZ in 11 31 CAMSHAFT (N52) .

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

Fig 14: Identifying Special Tools (11 4 461) And (00 9 120)

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Assemble engine.