11 31 573 Adjusting Camshaft Timing on Left Side

11 31 573 Adjusting camshaft timing on left side (N74)

Special tools required:

Important!
Release central bolts on adjustment unit only with special tool 11 9 890.
Risk of damage to timing drive.
If special tool 11 9 890 can not be fitted, it is necessary when releasing the central bolt to grip the hexagon head of the respective camshaft.

(cylinder bank 7 to 12)

Necessary preliminary tasks:

^ Remove left timing case cover
^ Check camshaft timing on left side

Get special tool 11 9 890 ready for securing camshafts.

Note:
Special tool 11 9 891 Knurled screw.

Special tool 11 9 892 Press-down bar.

Special tool 11 9 893 Gap gauge for inlet and exhaust camshafts.

Special tool 11 9 895 spacer.

Important!
If special tool 11 9 890 can not be fitted, it is necessary when releasing the central bolt to grip the hexagon head of the respective camshaft.

Release central bolts (1 and 2) of inlet and exhaust adjustment units.

Installation:
Replace central bolts after releasing.

Illustrations show cylinders 1 to 6.

Installation:
Coat contact face of new central bolt (1) with copper paste.

Important!
Solenoid valves for VANOS adjustment units must be removed.

Screw special tool 11 9 895 into cylinder head.

Position special tool 11 9 893 on inlet and exhaust camshafts.

The special tool 11 9 893 must rest without a gap on cylinder head; if necessary, adjust camshaft at hexagon heads.

Position special tool 11 9 892 on special tool 11 9 893.

Both special tools11 9 891 are secured with special tool 11 9 893.

Note:
Tighten down special tool 11 9 891 by hand.

Join central bolt (1) of intake adjustment unit (2).

Tightening torque: 11 36 1AZ.

Join central bolt (1) of exhaust adjustment unit (2).

Tightening torque: 11 36 1AZ.

Secure central bolt (1) of intake adjustment unit (2) with special tool 00 9 120.

Tightening torque: 11 36 1AZ.

Secure central bolt (1) of exhaust adjustment unit (2) with special tool 00 9 120.

Tightening torque: 11 36 1AZ.

Remove special tool 11 9 890.

Remove special tools 11 9 190 and 11 8 570.

Crank engine at central bolt twice in direction of engine rotation until engine returns to TDC firing position for cylinder 1.

Secure vibration damper with special tool 11 9 190 at TDC firing position for cylinder 1.

Fit special tool 11 9 893 on intake camshaft and check timing adjustment.

Note:
Timing is correctly adjusted when special tool 11 9 893 rests without a gap on cylinder head.

Remove all special tools.

Assemble engine.