11 31 505 Adjusting camshaft timing (N54)

Special tools required:

IMPORTANT: Risk of damage!
To open the central bolt at the camshaft, grip hexagon head on rear of camshaft.

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER

Remove fastener (1) in direction of arrow.

Installation note:

Install fastener (1) with bore facing outwards.

Fig 1: Installing Fastener With Bore Facing Outwards

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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: Positioning Flywheel Using 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.

Fit special tool 11 4 283 with screws (1).

Fit special tool 11 4 281 on special tool 11 4 283 .

IMPORTANT: If special tool 11 4 281 cannot be installed, the camshaft must be rotated at the hexagon head at the rear.

Fig 3: Securing Special Tool (11 4 283) On Cylinder Head With Screws

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With cylinder No. 1 in ignition TDC position, cams of exhaust camshaft (2) and intake camshaft (1) at 6th cylinder point downwards at an angle.

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

Fig 4: Identifying 1st Cylinder In Firing TDC Position

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Release central bolt (1) of exhaust camshaft.

Installation note:

Replace screw (1).

Tightening torque 11 36 1AZ .

Release central bolt (2) of inlet camshaft.

Installation note:

Replace screw (2).

Fig 5: Identifying Central Bolt Of Exhaust Camshaft And Inlet Camshaft

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Tightening torque 11 36 1AZ .

Rotate increment wheels until retaining pins on special tool 11 8 520 match up.

Push special tool 11 8 520 onto cylinder head.

Secure special tool 11 8 520 with bolts (1 and 2).

NOTE: Bolts M6 x 45 (1 and 2) with captive washer.

Fig 6: Securing Special Tool (11 8 520) With Bolts

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REMOVE CHAIN TENSIONER (1).

Screw special tool 11 9 340 into cylinder head.

Pre-tension timing chain with special tool 00 9 250 to 0.6 Nm.

Tighten central bolts (2 and 3) with special tool 00 9 120 .

Tightening torque 11 36 1AZ .

Fig 7: Identifying Chain Tensioner And Central Bolts

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Remove all special tools.

Crank engine on the central bolt twice in the direction of engine rotation and check the TIMING .

Assemble engine.