11 31 005 Check engine timing of camshaft (N12)

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

IMPORTANT: Modified procedure for timing adjustment.
The timing is not determined at firing TDC of cylinder no. 1.
All pistons are in the 90° position.
Check locking of adjustment units.
Observe direction of engine rotation (direction of rotation always clockwise when viewed towards timing drive side).

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Remove front splash guard.

IMPORTANT: Danger of mixing up special tool bore.
Balance hole and special tool bore can be mixed up; all pistons must be in the 90° position.
If necessary, determine by means of spark plug bore.

Rotate crankshaft at central bolt.

Position crankshaft with special tool 11 9 590 .

Do not remove special tool 11 9 590 during repair work.

Fig 1: Identifying Special Tool (11 9 590)

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IMPORTANT: Check locking on VANOS adjustment units.
Attempt to rotate camshaft in direction of rotation at hexagon head.
The adjustment units are locked in the initial position when the camshafts are non-positively connected to the adjustment units.
If no fixed connection to the camshaft can be established, the adjustment unit is faulty and must be replaced.

Both camshafts are in the correct installation position when the designation (IN) for inlet camshaft points upwards.

In the case of the exhaust camshaft, the designation EX must point upwards.

Fig 2: Identifying Designations For Inlet Camshaft (IN) And Exhaust Camshaft (EX)

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Position of exhaust camshaft (A) points at an angle to the right in an upper outward direction

Fig 3: Identifying Exhaust Camshaft

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Position of inlet camshaft (E) points at an angle to the left in an upper outward direction.

Fig 4: Identifying Inlet Camshaft

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Partially release positive battery cable. Release chain tensioner (1).

Fig 5: Identifying Chain Tensioner

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Tightening torque: 11 31 4AZ.

IMPORTANT: Have a cleaning cloth ready. A small quantity of engine oil will escape after the screw connection has been released. Make sure no oil runs onto the belt drive.

Installation note: A new sealing ring must be installed by service personnel when the chain tensioner is fitted.

Screw special tool 11 9 340 into the cylinder head.

Fig 6: Installing Special Tool (11 9 340) Into Cylinder Head

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Pre-tension timing chain with special tool 00 9 460 to 0.6 Nm.

Place (position) special exhaust tool 11 9 540 on mounting flats of exhaust camshaft.

Fig 7: Positioning Special Tool On Exhaust Camshaft Dihedron

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Place (position) special intake tool 11 9 540 on mounting flats of intake camshaft.

Fig 8: Positioning Special Tool On Inlet Camshaft Dihedron

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IMPORTANT: Observe direction of rotation (direction of rotation always clockwise when viewed towards timing drive side). A reverse rotation of the engine is not permitted, test adjustment values will be distorted.

If necessary, adjust VALVE TIMING .

Assemble engine.