11 31 005 Checking camshaft timing (N14)

Special tools required:

IMPORTANT: Modified procedure for timing.
The timing is not determined at firing TDC of cylinder no. 1.
All pistons are in the 90° position.
Check locking of adjuster.
Observe direction of rotation (direction of rotation clockwise when viewed towards timing drive side).
A reverse rotation of the engine is not permitted, test adjustment values will be distorted.

Necessary preliminary work:

Remove CYLINDER HEAD COVER .

IMPORTANT: Check locking on VANOS unit.
Turn camshaft in direction of rotation at hexagon head.
The adjustment unit is locked in the initial setting when the camshaft is non-positively connected to the adjustment unit.
If no fixed connection to the camshaft is established, the adjuster is faulty and must be replaced.

Check lock of VANOS unit.

Use an open-end spanner (1) to twist intake camshaft in direction of arrow.

Installation note:

Maximum power 10 to 15 Nm.

If play of VANOS unit is below 10 degrees, the adjuster is OK.

Fig 1: Turning Intake Camshaft Using Open-End Spanner

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Both camshafts are in the correct installation position when the designation (IN) for intake camshaft points upwards.

In the case of the exhaust camshaft, the designation (EX) must point upwards.

NOTE: Illustration shows N12.

Fig 2: Identifying Intake And Exhaust Camshafts

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Position of intake camshaft (1) points at an angle to the right and upwards.

Fig 3: Positioning Of Intake Camshaft

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Position of exhaust camshaft (1) points at an angle to the right and downwards.

Fig 4: Positioning Of Exhaust Camshaft

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Partially release positive battery cable.

Release CHAIN TENSIONER (1).

Tightening torque: 11 31 4AZ .

IMPORTANT: Have a cleaning cloth ready. A small quantity of engine oil will escape after the screw connection has been released.
Make sure no oil runs onto the belt drive.

Fig 5: Identifying Chain Tensioner

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Installation note:

A new sealing ring must be installed by service personnel when the chain tensioner is fitted.

Screw special tool 11 9 340 into the cylinder head.

Pre-tension timing chain with special tool 00 9 460 to 0.6 Nm .

Fig 6: Identifying Special Tool (11 9 340)

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IMPORTANT: Danger of mixing up dowel hole.
Balance hole and special tool dowel hole can be mixed up; all pistons must be in the 90° position.
If necessary, determine by means of spark plug bore.

Further twist the crankshaft of the central bolt by 720 degrees.

Position crankshaft with special tool 11 9 590 .

Observe direction of rotation (direction of rotation always clockwise when viewed towards timing drive side).

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

Fig 7: Securing Crankshaft Using Special Tool (11 9 590)

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Check the preload of the timing chain again.

Retighten special tool 11 9 340 to 0.6 Nm .

Fig 8: Identifying Special Tool (11 9 340)

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Place (position) special exhaust tool 11 9 551 on mounting flats of exhaust camshaft.

Determine air gap using a feeler gauge (1).

If the measured value on the exhaust camshaft is below 1.9 mm, the timing is OK.

Fig 9: Positioning Special Exhaust Tool (11 9 551) On Exhaust Camshaft Mounting Flats

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Loosely place (position) special intake tool 11 9 551 on mounting flats of intake camshaft.

Determine air gap using a feeler gauge (1).

If the measured value on the intake camshaft is below 2.5 mm, the timing is OK.

Fig 10: Positioning Special Intake Tool (11 9 551) On Intake Camshaft Mounting Flats

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IMPORTANT: Do not rotate engine without special tool 11 9 340 or a chain tensioner, the timing chain may skip on the gear of the intake camshaft.

Screw lock nut (1) hand-tight on special tool 11 9 340 .

Remove special tool 11 9 340 .

Fig 11: Screwing Lock Nut Hand-Tight On Special Tool (11 9 340)

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Assemble engine.