11 36 047 Removing and installing/replacing inlet and exhaust adjustment units on left side (N62): Removal

Removal of inlet and exhaust adjustment units is described separately from installation.

CAUTION: Screw (1) is a special screw and must not be replaced with a normal M8 screw.

Release screw (1).

Fig 1: Unclipping Oil Line From Retainers

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Unclip oil line (3) from retainers (2) and remove.

Crank engine at central bolt in direction of rotation to firing TDC position of 1st cylinder.

NOTE: With 1st cylinder in firing TDC position, cams of inlet and exhaust camshafts at 5th cylinder point upwards at an angle as shown in illustration.

Fig 2: Identifying Cams Of Inlet And Exhaust Camshafts

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NOTE: Alignment hole for TDC position is at front on timing case cover.

Crank engine at central bolt and secure vibration damper with special tool 11 9 190 in firing TDC position of 1 st cylinder.

Fig 3: Securing Vibration Damper

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CAUTION: When the engine is shut down, the inlet and exhaust adjustment unit is normally locked in its initial position.

The situation may arise in some individual cases where this initial position is not reached and the camshaft can continue to be rotated in the adjustment range of the adjustment unit.

In order to avoid incorrect timing adjustment, it is essential to check the locking of the adjustment unit and if necessary perform locking by rotating the camshafts.

Checking locking of inlet adjustment unit in initial position:

Engage hexagon head of inlet camshaft and attempt to rotate inlet camshaft carefully against direction of rotation.

Fig 4: Rotating Inlet Camshaft

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If there is no fixed connection between inlet camshaft and inlet adjustment unit, rotate inlet camshaft against direction of rotation as far as it will go.

The inlet adjustment unit is locked in the initial position when the inlet camshaft is non-positively connected to the inlet adjustment unit.

Checking locking of exhaust adjustment unit in initial position:

Engage hexagon head of exhaust camshaft and attempt to rotate exhaust camshaft carefully in direction of rotation.

Fig 5: Rotating Exhaust Camshaft

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If there is no fixed connection between exhaust camshaft and exhaust adjustment unit, rotate exhaust camshaft in direction of rotation as far as it will go.

The exhaust adjustment unit is locked in the initial position when the exhaust camshaft is non-positively connected to the exhaust adjustment unit.

CAUTION: If the inlet or exhaust adjustment unit of the camshafts "cannot" be locked as described, the adjustment unit is faulty and must be replaced.

Remove special tool 11 9 190.

Crank engine at central bolt against direction of rotation to 45° before TDC position.

Fig 6: Cranking Engine