11 31 005 Checking camshaft timing (N54, N54T)

Special tools required:

IMPORTANT: When the engine is shut down, the intake and exhaust camshaft adjusters are normally locked in their initial setting. In order to avoid incorrect timing adjustment, it is essential to check the locking of the camshaft adjuster and if necessary perform locking by rotating the camshafts.

Necessary preliminary tasks

Remove CYLINDER HEAD COVER .
Remove front underbody protection. See 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION .

Remove fastener (1) in direction of arrow.

Installation note:

Install fastener (1) with bore facing outwards.

Fig 1: Removing Cylinder Head Cover Fastener

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Rotate crankshaft at central bolt into TDC setting.

Slide in special tool 11 0 300 in direction of arrow and block crankshaft.

IMPORTANT: On engines with automatic transmissions, there is shortly before the special tool bore for the TDC position a large bore which can be confused with the special tool bore.

Fig 2: Sliding Special Tool (11 0 300)

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If the flywheel is secured in the correct bore with special tool 11 0 300 , the engine can no longer be moved at the central bolt.

With 1st cylinder in ignition TDC position, cams of intake camshaft (1) at 6th cylinder point downwards at an angle.

With 1st cylinder in ignition TDC position, cams of exhaust camshaft (2) at 6th cylinder point downwards at an angle.

Roller cam follower is not actuated.

Fig 3: Identifying Intake And Exhaust Camshaft

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NOTE: If the timing is checked while the engine is installed, the position of the camshaft can only be checked with a mirror.

Secure special tool 11 4 283 on cylinder head with screws (1).

Mount special tool 11 4 281 on intake and exhaust camshafts.

If the special tools 11 4 281 cannot be attached, the TIMING must be adjusted.

Fig 4: Identifying Special Tool (11 4 281) And (11 4 283)

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Remove all special tools.

Assemble engine.