11 31 005 Checking camshaft timing (N55)

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.

IMPORTANT: For the positioning of the special tool 11 4 281 on the mounting flats of the intake camshaft, a collision with the cylinder throttle return spring 1 can occur.
Special tool 11 4 281 reconditions at following description.

Check for freedom of movement of throttle return spring at intermediate lever cylinder 1.

Recondition special tool 11 4 281 .

Rework chamfer on special tool 11 4 281 as shown in the range of 50 millimeters long and 8.5 millimeters wide.

Fig 1: Checking For Freedom Of Movement Of Throttle Return Spring

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Recondition chamfer on special tool 11 4 281 to 8.5 millimeters (see illustration).

Fig 2: Checking Chamfer On Special Tool

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Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Remove underbody protection. See FRONT UNDERBODY PROTECTION or FRONT UNDERBODY PROTECTION (AWD) .
Remove FAN COWL
Remove REINFORCEMENT PLATE(all-wheel drive vehicles only)

Remove fastener (1) in direction of arrow.

Installation note:

Install fastener (1) with bore facing outwards.

Fig 3: Installing Fastener With Bore Facing Outwards

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Rotate crankshaft at central bolt into TDC setting.

Slide special tool 11 0 300 in direction of arrow into dowel hole and secure crankshaft.

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

Fig 4: Sliding Special Tool (11 0 300) In Direction Of Arrow

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NOTE: Vehicles with automatic transmission can only be secured to the specified position on flywheel (1) (see arrow in illustration).

Fig 5: Securing Flywheel

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With 1st cylinder in TDC firing position, cams of intake camshaft (1) point upward at an angle.

Fig 6: Identifying TDC Firing Position Cams Of Intake Camshaft

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With 1st cylinder in TDC firing position, cams of the exhaust camshaft (1) point upwards at an angle.

Fig 7: Identifying 1st Cylinder In TDC Firing Position/Exhaust Camshaft

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The timings are correct when the part numbers or read code (1) and the intake and exhaust camshafts point upwards.

Fig 8: Identifying Part Numbers On Intake And Exhaust Camshafts

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Secure special tool 11 4 285 with bolts (1) to cylinder head.

NOTE: Fit special tool 11 4 282 underneath on side of intake camshaft.

Mount reworked special tool 11 4 281 on the intake camshaft.

Mount special tool 11 4 281 on the exhaust camshaft.

Fig 9: Fitting Special Tools 11 4 285, 11 4 282 And 11 4 281

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If necessary, adjust VALVE TIMING .

Assemble engine.