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

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

Special tools required:

11 4 480
11 9 000
11 9 590
11 9 650
11 9 652

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. See Removing and installing/replacing inlet and exhaust adjustment units .

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: Caution For Cylinder Head

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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: Screws Of Bearing Bridge Must Not Be Opened; Releasing Bearing Bridge Will Result In Damage To 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 tidy and orderly fashion.

Fig 3: Sequence Of Bearing Cap Screws

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

Fig 4: Identifying Camshaft Identification (IN And 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 note:

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

Plastic 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 in illustration).

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 aluminium profile insert.

Installation:

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

Fig 8: Locating Roller Rocker Arm Position

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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 Installation Position (2)

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

Designation (EX) on exhaust camshaft points upwards.

Fig 10: Identifying Camshafts Identification (IN And 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: Lubricate All Bearing Points (2) With Engine Oil

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

Pretension camshaft (2).

Fit and secure bearing bridges.

Fig 12: Identifying Special Tool (11 9 650)

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

Fig 13: Identifying Bearing Bridges

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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: Sequence Of Bearing Cap Screws

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Adjust VALVE TIMING .

Assemble engine.