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: Locating Bearing Bracket Screws

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IMPORTANT:

Risk of damage to spark plug bores.

Check special tool screws (1) 11 9 652 for damage.

Fasten special tool 11 9 650 on cylinder head with special tool screws (1) 11 9 652 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: Tightening Sequence Of Exhaust Camshaft 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 Intake camshaft

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

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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).

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

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

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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 aluminium 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: Checking For Proper Seating Of Roller Cam Follower Arm

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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

Designation (EX) on exhaust camshaft points upwards.

Fig 9: Identifying Designations For Intake Camshaft (IN) And Exhaust Camshaft (EX)

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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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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.

Pre-tension camshaft (2).

Fit and secure bearing brackets.

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

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

Fig 12: Locating Allocation Markings Of Exhaust Camshaft 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: Tightening Sequence Of Exhaust Camshaft Bearing Cap Screws

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Adjust VALVE TIMING .

Assemble engine.