11 31 505 Adjusting timing of camshaft(s) (N52K)

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 vehicles with optional extra SA205 (automatic transmission), there is a large bore for the TDC position shortly before the special tool bore. This bore 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.

Cam follower (1) is not actuated.

NOTE: When the engine is installed, the position of the exhaust camshaft (3) for the timing can only be checked with a mirror.

Fig 5: Exhaust Camshaft And Cam Follower

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Secure special tool 11 4 283 to cylinder head with bolts (1).

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

Mount special tool 11 4 281 on intake and exhaust camshafts.

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: Picture 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 intake and exhaust adjustment units with special tool 00 9 120 to intake and exhaust camshafts.

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.