Cylinder Head Assembly: Adjustments

Valve Timing, Checking

• A revised camshaft adjuster is being installed as of 12.08. To recognize the new adjuster: Starting in 12.08 the exhaust camshaft adjuster 32A has a plastic cover. For the allocation, refer to the parts catalog.

=> [ Vehicles through 11.08 ]

=> [ Vehicles from 12.08 ]

Vehicles through 11.08

Special tools, testers and auxiliary items required

• Camshaft Bar (T10068 A)

Sequence

- Remove the noise insulation.

- Remove the intake manifold, refer to one of the following:

With a one piece intake manifold, refer to => [ Intake Manifold ] Intake Manifold.

With a two piece intake manifold => [ Upper Intake Manifold ] Upper Intake Manifold.

- Remove the cylinder head cover. Refer to => [ Cylinder Head Cover ] Service and Repair.

- Rotate the crankshaft at the vibration damper bolt in engine rotation direction to the Top Dead Center (TDC) cylinder 1 mark - arrow -.





the camshaft lobes - A - for cylinder 1 must face each other.





- Install the (T10068 A) into both camshaft grooves.





• Due to the camshaft adjuster function, the camshaft grooves may not be perfectly horizontal. Therefore, if necessary, rotate the camshaft back and forth slightly using an open end wrench on the camshaft recesses - arrows - in order to install the (T10068 A).





Verify the installation mark of the camshaft adjuster with the marks on the control housing:





• The "arrow" - item 1 - on the intake camshaft adjuster must align with the notch - 2 - on the far right of the control housing. Marks on control housing.

• The mark - 1 - on the exhaust camshaft adjuster which the "arrow" points to must align with the notch - 2 - on the far right of the control housing. Marks on control housing.





• A small offset between the mark - 1 - and notch - 2 - is permitted.

- The distance between the marks on the camshaft adjuster must be exactly 16 rollers of the timing chain.





If the marks do not match:

- Adjust the valve timing. Refer to => [ Oil Pump Drive Timing Chain, Installing ] Oil Pump Drive Timing Chain, Installing.

If the marks match:

- Install the cylinder head cover. Refer to => [ Cylinder Head Cover ] Service and Repair.

- Install the intake manifold, refer to one of the following:

With a one piece intake manifold, refer to => [ Intake Manifold ] Intake Manifold.

With a two piece intake manifold, refer to => [ Upper Intake Manifold ] Upper Intake Manifold.

Marks on Control Housing





- A - Flywheel, side view

- B - Vibration damper, side view

Notches - arrows - are reference points for the mark on the camshaft adjusters.

Vehicles from 12.08

Special tools, testers and auxiliary items required

• Camshaft Bar (T10068 A)

Sequence

- Remove the noise insulation.

- Remove the upper intake manifold. Refer to => [ Upper Intake Manifold ] Upper Intake Manifold.

- Remove the cylinder head cover. Refer to => [ Cylinder Head Cover ] Service and Repair.

- Rotate the crankshaft at the vibration damper bolt in engine rotation direction to the Top Dead Center (TDC) cylinder 1 mark - arrow -.





The camshaft lobes - A - for cylinder 1 must face each other.





- Install the (T10068 A) into both camshaft grooves.





• Due to the camshaft adjuster function, the camshaft grooves may not be perfectly horizontal. Therefore, if necessary, rotate the camshaft back and forth slightly using an open end wrench on the recesses - arrows - in order to install the (T10068 A).





Verify the installation marks of the camshaft adjuster with the marks on the control housing:

• The arrows on the camshaft adjusters must line up with the notches on the right side of the control housing. Marks on control housing.





• A slight offset between the 32A mark and the notch is permitted.

• Do not pay attention to the position of the copper colored chain links.

- The distance between the marks on the camshaft adjuster must be exactly 16 rollers of the timing chain.





If the marks do not match:

- Adjust the valve timing. Refer to => [ Oil Pump Drive Timing Chain, Installing ] Oil Pump Drive Timing Chain, Installing.

If the marks match:

- Install the cylinder head cover. Refer to => [ Cylinder Head Cover ] Service and Repair.

- Install the upper intake manifold. Refer to => [ Upper Intake Manifold ] Upper Intake Manifold.

Marks on Control Housing





- A - Flywheel, side view

- B - Vibration damper, side view

Notches - arrows - are reference points for mark on camshaft adjusters.