11 31 505 Adjusting camshaft timing (N14)

Special tools required:

00 9 120
00 9 250
11 9 340
11 9 551
11 9 590

IMPORTANT:

Modified procedure for timing setting.

The timing is not determined at firing TDC of cylinder no. 1.

All pistons are in the 90° position.

Check locking of adjusters.

To open the central bolt at the camshaft, grip hexagon head on rear of camshaft.

A reverse rotation of the engine is not permitted, test adjustment values will be distorted.

Necessary preliminary tasks:

Check TIMING .

IMPORTANT:

Danger of mixing up dowel hole.

Balance hole and dowel hole can be mixed up; all pistons must be in the 90° position.

If necessary, determine by means of spark plug bore.

Rotate crankshaft at central bolt.

Slide in special tool 11 9 590 in direction of arrow and block crankshaft.

A reverse rotation of the engine is not permitted, test adjustment values will be distorted.

Fig 1: Identifying Special Tool (11 9 590) On Crankshaft

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IMPORTANT:

Risk of damage to chain drive!

To open central bolt, mount special tool 11 9 551 on camshaft.

If the setting gauges cannot be positioned, grip the camshaft with an open-end wrench to release the central bolt.

Fig 2: Identifying Special Tool (11 9 522) And (11 9 551)

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Release special tool 11 9 340.

Fig 3: Identifying Special Tool (11 9 340) Into Cylinder Head

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To open central bolts (3) on camshafts, install special tool 11 9 551.

Release central bolts (3).

Tightening torque 11 36 2AZ

Fig 4: Identifying Central Bolt, Sprocket Wheel And Timing Chain

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To open central bolts (3) on camshafts, install special tool 11 9 551.

Release central bolts (3).

Tightening torque 11 36 1AZ

Fig 5: Identifying Central Bolt

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The designations for the intake camshaft (IN) and exhaust camshaft (EX) point upwards.

Both camshafts (inlet and exhaust) have three machined surfaces to enable special tool 11 9 551 to be mounted.

The fourth surface is not machined and is crescent-shaped - it must point downwards.

NOTE: Picture shows

Fig 6: Identifying Camshaft Designation (IN) And (EX)

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Position of exhaust camshaft (1) points at an angle to the right in a lower inward direction.

NOTE: Picture shows sprocket wheel removed.

Fig 7: Positioning Of Exhaust Camshaft

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Position of intake camshaft (1) points at an angle to the left in an upper inward direction.

NOTE: Picture shows VANOS adjustment unit removed.

Fig 8: Positioning Of Intake Camshaft

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Screw special tool 11 9 340 into cylinder head.

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

Fig 9: Screwing Special Tool (11 9 340) Into Cylinder Head

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Secure central bolt (1) with special tool 00 9 120 or an electronic torque wrench.

Tightening torque 11 36 1AZ

Fig 10: Identifying Central Bolt And Special Tool (00 9 120)

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Secure central bolt (1) with special tool 00 9 120 or an electronic torque wrench.

Tightening torque 11 36 2AZ

Fig 11: Securing Central Bolt With Special Tool (00 9 120) Or An Electronic Torque Wrench

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Remove all special tools.

Assemble engine.