Removing and Installing/Replacing Inlet and Exhaust Adjustment Units on Left Side
11 36 047 Removing and installing/renewing inlet and exhaust camshaft adjusters on left side (N74)Special tools required:
Important!
When the engine is shut down, the inlet and exhaust camshaft adjusters is normally locked in its initial position.
The situation may arise in some individual cases where this initial position is not reached and the camshaft can continue to be rotated in the adjustment range of the camshaft adjuster.
(cylinder bank 7 to 12)
Necessary preliminary tasks:
^ Read fault memory and make a documentary record
^ Remove left cylinder head cover
^ Remove left timing case cover
^ Check timing.
To release central bolts, use special tool 11 9 890 or grip at hexagon head of camshaft.
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 camshafts.
Release central bolts (1 and 2) of inlet and exhaust camshaft adjusters.
Installation:
Replace central bolts after releasing.
Important!
Check whether head of central bolt (1) is greased (see arrow).
If no grease can be seen on the bolt head of central bolt (1), the VANOS gear must be replaced for safety reasons.
Installation:
Coat contact face of central bolt (1) with copper paste.
Release hexagon socket screw.
Release special tool 11 9 900 at knurled screws and remove.
Release screws (1).
Remove upper tensioning rail (2).
Remove camshaft adjusters.
Note:
Shown without special tools for purposes of clarity.
Important!
Danger of mix-up:
Intake and exhaust camshaft adjusters are different.
Mixing up the inlet and exhaust camshaft adjusters will cause damage to the engine.
1. Inlet camshaft adjuster (1) is marked with ON
2. Exhaust (2) is marked with OFF
Installation:
Coat contact face of central bolt (1) with copper paste.
Note:
Position of camshaft adjusters (3 and 4) in relation to timing chain can be freely selected.
Feed camshaft adjuster into timing chain and position on camshafts.
Insert central bolts (1 and 2) on camshaft adjusters without gaps.
Release central bolts (1 and 2) by 90°.
Fit sliding rail (2) and secure with screws (1).
Tightening torque: 11 31 4AZ.
Get special tool 11 9 890 ready for securing camshafts.
Fit special tool 11 9 893 on intake camshaft.
Place special tool 11 9 893 on exhaust camshaft.
Screw special tool 11 9 895 into cylinder head.
Installation:
Align exhaust and inlet camshafts in such a way that special tools 11 9 893 rest without a gap on the cylinder head.
Press special tool 11 9 892 down with special tool 11 9 891.
Screw in special tool 11 9 900.
Pretension timing chain with special tool 11 9 900.
Preload hexagon socket screw with special tool 00 9 250 to 0.6 Nm.
Check special tools 11 9 190 for correct seating.
Connect intake camshaft adjuster (2) central screw (1).
Tightening torque: 11 36 1AZ.
Connect exhaust camshaft adjuster (2) central screw (1).
Tightening torque: 11 36 1AZ.
Secure central bolt (1) of inlet camshaft adjuster (2) with special tool 00 9 120.
Tightening torque: 11 36 1AZ.
Secure central bolt (1) of inlet camshaft adjuster (2) with special tool 00 9 120.
Tightening torque: 11 36 1AZ.
Remove special tools 11 9 190 and 11 8 570.
Crank engine at central bolt twice in direction of rotation until engine is in the firing TDC position cylinder 1 again.
Mount special tool11 8 570 on vibration damper with a bolt.
Secure special tool 11 9 190 at cylinder no. 1 TDC firing position.
Check timing again.
Remove all special tools.
