11 31 005 Checking camshaft timing (N55)

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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 .

Recondition chamfer on special tool 11 4 281 as shown in area that is 50 mm long and 8.5 mm wide.

Fig 1: Reconditioning Chamfer On Using Tool

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Rework chamfer to 8.5 mm on special tool 11 4 281 (see Fig 2).

Fig 2: Reconditioning To 8.5mm

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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: Removing 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 Crankshaft Using Special Tool (11 0 300)

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

Fig 5: Identifying Position For Fixing Special Tool To 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 Cams 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 Cams With Cylinder 1 At TDC

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The timings are correct when part numbers or read code (1) on intake and exhaust camshafts point towards top.

Fig 8: Locating Camshaft Designation

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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.

Place reworked special tool 11 4 281 on intake camshaft.

Place special tool 11 4 281 on exhaust camshaft.

Fig 9: Mounting Special Tools

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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 Tools (11 4 281)

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If necessary, adjust VALVE TIMING .

Assemble engine.