11 31 028 Removing and installing/replacing exhaust camshaft (N16)

Special tools required:

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 work:

Remove CYLINDER HEAD COVER .
Remove VACUUM PUMP .
Remove EXHAUST ADJUSTING UNIT for exhaust camshaft.
Release central bolt of intake camshaft adjuster.

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

Fig 1: Identifying Bearing Bracket Screws STOP Label

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IMPORTANT: Risk of damage to spark plug bores.
Check special tool (1 screw 11 9 652 ) for damage.
Fasten special tool 11 9 650 on cylinder head with special tool (1 screw 11 9 652 ) in spark plug holes.

Fig 2: Securing Special Tool (11 9 560) 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: Exhaust Camshaft Bearing Cap Screws Tightening Sequence

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IMPORTANT: Both camshafts have different identifies***
Mixing up the two camshafts will result *** damage.
EX Exhaust camshaft.
IN Intake camshaft

Fig 4: Identifying Designations For Exhaust (EI) And Intake (IN) Camshafts

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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).

Fig 5: Inserting Plastic Plain Rectangular Compression Ring Into Exhaust Camshaft Groove

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Lightly oil plastic rectangular compression ring (1) and rotate in direction of arrow until compression ring (1) is positioned on the exhaust camshaft.

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

Fig 6: Identifying Plastic Plain 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 strip.

Installation note:

Before installing exhaust camshaft, ensure that roller cam follower arm is correctly seated on the hydraulic valve clearance compensating element and valve.

Fig 7: Locating Roller Cam Follower

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Installation note:

Lubricate all bearing positions with engine oil.

Insert camshaft (1).

Pay attention to installation position (2).

Fig 8: Identifying Camshaft Installation Position

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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 9: Identifying Designations For Exhaust (EI) And Intake (IN) Camshafts

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Designation (EX) on exhaust camshaft points upwards.

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

Lubricate all bearing points (2) with engine oil.

Fig 10: Identifying Plain Rectangular Compression Rings And Bearing Points

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Pre-tension camshaft (2).

Fig 11: Securing Special Tool (11 9 560) On Cylinder Head

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Fit and secure bearing brackets.

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

Fig 12: Identifying Bearing Brackets

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Fit all bearing brackets 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 13: Exhaust Camshaft Bearing Cap Screws Tightening Sequence

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Adjust VALVE TIMING .

Assemble engine.