11 31 505 Adjusting camshaft timing (N51)

Special tools required:

00 9 120
00 9 250
11 0 300
11 4 280
11 4 281
11 4 282
11 4 283
11 4 290
11 9 340

Necessary preliminary tasks:

Remove Cylinder Head Cover

Remove fastener (1) in direction of arrow.

Installation:

Install fastener (1) with bore facing outwards.

Fig 1: Fastener And Removal Directions

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Rotate crankshaft at central bolt into TDC position.

Slide special tool 11 0 300 in direction of arrow into special tool bore and secure 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.

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

Fig 2: Special Tool (11 0 300)

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

Fig 3: Inlet Camshaft

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Part numbers (2) on intake and exhaust camshafts (1) point upwards.

Fig 4: Part Number And Camshaft

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With 1st cylinder in firing TDC position, cams of exhaust camshaft (3) at 6th cylinder point downwards at an angle.

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

Fig 5: Exhaust Camshaft And Cam Follower

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IMPORTANT: Risk of damage!

To open central bolt, mount special tools 11 4 283 11 4 281 and 11 4 282 on camshaft.

Fig 6: Bolts, Special Tools (11 4 281), (11 4 282) And (11 4 283)

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Release central bolts (1).

Release central bolts (1) with special tool 11 4 280 only.

Release chain tensioner (2) (have a cleaning cloth ready).

NOTE: Illustrations in CAD and does not show special tools.

Fig 7: Identifying Central Bolts And Chain Tensioner

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Turn sensor gears (2) in direction of arrow until locating pins (1) on special tool 11 4 290 match up.

Slide on special tool 11 4 290 in direction of arrow.

Fig 8: Special Tool (11 4 290), Sensor Gears And Locating Pins

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Secure special tool 11 4 290 with bolts (1).

Screw special tool 11 9 340 into cylinder head.

Pretension timing chain with special tool 00 9 250 to 0.6 Nm.

Secure both central bolts of adjustment units to camshafts with special tool 00 9 120.

For tightening torque refer to 11 36 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL VANOS .

Fig 9: Bolts, Special Tool (11 4 290), (11 9 340), (11 4 280) And (00 9 120)

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Assemble engine.