11 31 028 Removing and installing/replacing exhaust camshaft (N18)

Special tools required:

IMPORTANT: It is absolutely essential to follow an exact procedure for dismantling and installing the exhaust camshaft.

Necessary preliminary work:

Remove CYLINDER HEAD COVER .
Check TIMING .
Remove CHAIN TENSIONER .

IMPORTANT: Use special tool 32 2 100 to check the function of the adjusting unit by rotating the camshaft.

To release central bolts, always use special tool 11 7 440 of exhaust camshaft.

Position the special tool 11 7 440 at the mounting flats of the exhaust camshaft and fasten it with a screw (1).

Fig 1: Locating Sealing Compound Applying Area

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IMPORTANT: Use special tool 11 7 440 to check the function of the adjusting unit by rotating the camshaft.

Position special tool 11 7 440 on intake and exhaust camshafts.

Secure special tool 11 7 440 on the cylinder head with screws (1).

Fig 2: Positioning Special Tool (11 7 440) On Intake And Exhaust Camshaft

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Unfasten screws (2).

Remove tensioning rail (1).

Fig 3: Identifying Tensioning Rail And Screws

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Release screw (1).

Tightening torque: 11 11 3AZ .

Fig 4: Identifying Screw

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Release central bolt (2).

Tightening torque: 11 36 2AZ .

Guide the VANOS unit in front of the timing chain toward the front.

Fig 5: Identifying VANOS Unit Central Bolts

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IMPORTANT: Removed cylinder head:
When using special tool 11 9 000 , it will be necessary to remove the aluminum strip.

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

Fig 6: Securing Special Tool (11 9 560) On Cylinder Head

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Release all screws on bearing caps (1 and 2).

Tightening torque: 11 12 8AZ .

Bearing cap (1) is a thrust bearing and has the number (0).

All bearing caps (2) are identified with numbers from (1 to 4).

Fig 7: Identifying Bearing Caps

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Exhaust camshaft is identified with identification (EX).

Insert the exhaust camshaft so that the designation (EX) can be read from above.

Fig 8: Identifying Designations For Exhaust (EI) And Intake (IN) Camshafts

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Position exhaust camshaft (1) so that cam of exhaust camshaft (2) points outward at an angle.

Installation note:

Lubricate all bearing positions with engine oil.

Fig 9: Identifying Camshaft Installation Position

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Assemble engine.

Installation note:

Adjust VALVE TIMING .