Camshaft: Adjustments

11 31 505 Adjusting Camshaft Timing (N16)

Special tools required:







IMPORTANT:
Modified procedure for timing adjustment.
The timing is not determined at firing TDC of cylinder no. 1.
All pistons are in the 90° position.
Check locking of adjustment units.
Observe direction of engine rotation (direction of rotation always clockwise when viewed towards timing drive side).
To open the central bolt at the camshaft, grip hexagon on rear of camshaft.
Risk of damage.







Necessary preliminary tasks:
- Remove cylinder head cover.
- Check timing.







IMPORTANT:
Danger of mixing up special tool bore.
Balance hole and special tool bore 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.
11 9 590 Slide in special tool in direction of arrow and block crankshaft.







IMPORTANT:
Risk of damage.
To open central bolt, mount special tool on camshaft 11 9 540.
If the setting gauges cannot be positioned, grip the camshaft with an open-end wrench to release the central bolt.







Release chain tensioner (have a cleaning cloth ready).
Tightening torque: 11 31 4AZ.







To open central bolts (1 and 2) on camshafts, install special tool 11 9 540.
Release central bolts (1 and 2).
Tightening torque: 11 36 1AZ.







The designations for the inlet camshaft (IN) and exhaust camshaft (EX) point upwards.
Both camshafts (inlet and exhaust) have three machined surfaces to enable special tool 11 9 450 to be mounted.
The fourth surface is not machined and is crescent-shaped - it must point downwards.







Position of exhaust camshaft (A) points at an angle to the right in an upper outward direction







Position of inlet camshaft (E) points at an angle to the left in an upper outward direction.







Turn exhaust camshaft in direction of arrow with special tool 32 2 100.







Preload camshaft with special tool 32 2 100.
Seat special tool 11 9 540 (exhaust side) on mounting flats and secure with a screw (1).







Seat special tool 11 9 540 (inlet side) on mounting flats and secure with a screw (1 and 2).







Screw special tool 11 9 340 into cylinder head.
Pre-tension timing chain with special tool 00 9 250 to 0.6 Nm.







Secure central bolt (1) with special tool 00 9 120 or an electronic torque wrench.
Tightening torque: 11 36 1AZ.







Secure central bolt (1) with special tool 00 9 120 or an electronic torque wrench.
Tightening torque: 11 36 1AZ.







Remove all special tools.
Assemble engine.

N16: