Camshaft: Adjustments
11 31 505 Adjusting camshaft timing (N18)Special tools required:
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.
Risk of damage!
Necessary preliminary work:
^ Remove cylinder head cover.
^ 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.
11 9 590 Slide in special tool in direction of arrow and block crankshaft.
To open central bolts (1 and 2) on camshafts, install special tool 11 7 440.
If the setting gauges cannot be positioned, grip the camshaft with an open-end wrench to release the central bolt.
Release central bolts (1 and 2).
Tightening torque:11 36 1AZ.
Position special tool 11 7 440 on the mounting flats of the exhaust camshaft and twist with special tool 32 2 100 if necessary.
Secure special tool 11 7 440 with bolt (1) to cylinder head.
Position special tool 11 7 440 on the mounting flats of the intake camshaft and twist with special tool 32 2 100 if necessary.
Secure special tool 11 7 440 with bolts (1) to cylinder head.
Release chain tensioner (have a cleaning cloth ready).
Tightening torque: 11 31 4AZ.
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 7 440 to be mounted.
The fourth surface is not machined and has a half-moon form.
Position of exhaust camshaft (A) points at an angle to the right and up.
Position of intake camshaft (E) points at an angle to the left and up.
11 9 340 Screw special tool into cylinder head.
Pre-tension timing chain with special tool 00 9 460 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.
N18:
