11 31 028 Removing and installing/replacing exhaust camshaft (N12)

WARNING: This page is about a different variant/trim than selected.

IMPORTANT: It is absolutely essential to follow an exact procedure for removing and installing the exhaust camshaft.
Modified procedure for timing adjustment.
All pistons are in the 90° position.
Risk of damage!

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Remove VACUUM PUMP .
Remove EXHAUST ADJUSTING UNIT for exhaust camshaft.
Release central bolt of inlet adjustment unit.

IMPORTANT: The screws of the bearing bridge must not be opened.
Releasing the bearing bridge will result in damage to the cylinder head.

Fig 1: Identifying Bearing Bridge With Screws

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IMPORTANT: Risk of damage to spark plug bores.
Check special tool 11 9 652 for damage.

Secure special tool 11 9 650 on cylinder head with screws 1 in spark plug holes.

Fig 2: Securing Special Tool (11 9 650) On Cylinder Head

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IMPORTANT: Release bearing caps with special tool 11 9 650 only.
Shown without special tools for purposes of clarity.

Release bearing cap screws from 10 to 1.

Set all bearing caps down in special tool 11 4 480 in a neat and orderly fashion.

Fig 3: Removing Bearing Caps Using Special Tool

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

Fig 4: Identifying Designations For Inlet Camshaft (IN) And Exhaust Camshaft (EX)

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Metal rectangular compression ring

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

Only replace compression rings (1) when they are broken.

The compression rings have catches at the joint.

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

Fig 5: Replacing Compression Rings

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Make sure plain compression rings (1) can move freely.

Installation:

When exhaust camshafts are inserted, no joint must point to a separating joint.

Plastic rectangular compression ring

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 6: Inserting Plastic Rectangular Compression Ring Into Intake Camshaft Groove

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

Fig 7: Identifying Plastic Rectangular Compression Rings

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IMPORTANT: Removal on engine:
Block engine with special tool 11 9 590 .
Removed cylinder head:
When using special tool 11 9 000 , it will be necessary to remove the aluminum profile insert.

Installation:

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

Fig 8: Identifying Roller Cam Follower

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Installation:

Lubricate all bearing points with engine oil.

Insert camshaft (1).

Pay attention to installation position (2).

Fig 9: Identifying Camshaft With Bearing Points

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

Designation (EX) on exhaust camshaft points upwards.

Fig 10: Identifying Designations For Inlet Camshaft (IN) And Exhaust Camshaft (EX)

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Make sure plain compression rings (1) can move freely.

Align plain compressing rings (1) in downward direction.

Lubricate all bearing points (2) with engine oil.

Fig 11: Identifying Compressing Rings With Bearing Points

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Secure special tool 11 9 650 on cylinder head with screws 1 in spark plug holes.

Pre-tension camshaft (2).

Fit and secure bearing brackets.

Fig 12: Securing Special Tool (11 9 650) On Cylinder Head With Screws

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Bearing bridges, allocation of exhaust camshaft from (0 to 4).

Fig 13: Identifying Bearing Bridges And Exhaust Camshaft

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Fit all bearing bridges from 0 to 4.

Secure screws in sequence (1 to 10).

Tightening torque: 11 12 8AZ.

NOTE: Shown without special tool 11 9 650 for purposes of clarity.

Fig 14: Screw Tightening Sequence

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Adjust valve timing.

Assemble engine.