11 31 005 Checking camshaft timing (N55)

Special tools required:

IMPORTANT: When the engine is stopped, 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 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 Freedom Of Movement Of Return Spring

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

Fig 2: Reworking Chamfer On Special Tool (11 4 281)

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Necessary preliminary tasks:

Remove fastener (1) in direction of arrow.

Installation note:

Install fastener (1) with bore facing outwards.

Fig 3: Installing Fastener

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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: Securing Flywheel Using Special Tool (11 0 300)

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NOTE: Can only be secured to the specified position on flywheel (1) (see arrow).

Fig 5: Identifying Correct Position For Special Tool On 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 Position Of Intake Camshaft With Cylinder 1 At TDC

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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 Position Of Exhaust Camshaft With Cylinder 1 At TDC

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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: Intake And Exhaust Camshaft Data Code

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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: Installing Special Tool (11 4 281) On Exhaust Camshaft

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The exhaust camshaft timing is correct when special tool 11 4 281 is slightly in contact to intake side.

Fig 10: Checking Exhaust Camshaft Timing Using Special Tool 11 4 281

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The intake camshaft timing is correct when special tool 11 4 281 is slightly in contact to intake side.

Fig 11: Checking Intake Camshaft Timing Using Special Tool 11 4 281

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Twist special tools 11 4 281 by hand in direction of arrow up to limit position.

Both gauges must lie flat on special tool 11 4 285 .

Fig 12: Twisting Special Tool 11 4 281 To Limit Position

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If necessary, adjust VALVE TIMING .

Assemble engine.