11 31 005 Checking camshaft timing (N14)
The timing is not determined at firing TDC of cylinder no. 1.
All pistons are in the 90° position.
Check locking of adjustment unit.
Observe direction of rotation (direction of rotation always clockwise when viewed towards timing drive side).
Necessary preliminary tasks:
- Remove CYLINDER HEAD COVER .
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.
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.
Position of intake camshaft (1) points at an angle to the right in an upper inward direction.
Position of exhaust camshaft (1) points at an angle to the right in an upper inward direction.
Partially release positive battery cable.
Release CHAIN TENSIONER (1).
Tightening torque 11 31 4AZ
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.
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 .
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.
Check the preload of the timing chain again.
Retighten special tool 11 9 340 to 0.6 Nm .
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.
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.
Installation note:
If the measured values of 2.0 and 2.6 mm are exceeded, dimension A on special tool 11 9 340 must be determined.
Screw lock nut (1) hand-tight on special tool 11 9 340.
Remove special tool 11 9 340.
If dimension A is below 68 mm, adjust VALVE TIMING .
If dimension A is below 72 mm, the service chain tensioner from BMW "Product and Measures Management Aftersales measure 10686850" is also to be installed.
If dimension A is above 72 mm, the entire timing chain drive is to be replaced.
Assemble engine.