Cylinder Head

Cylinder Head

Removing

• Engine removed.

• Engine separated from transmission.

- Remove drive plate => [ Drive Plate ] Drive Plate.

- Remove upper section of intake manifold => [ Intake Manifold Upper Section ] Cylinder Head, Valvetrain.

- Remove intake manifold lower section => [ Intake Manifold Lower-Section ] Intake Manifold Lower-Section.

- Remove cylinder head covers => [ Cylinder Head Cover ] Service and Repair.

- Remove camshaft timing chains => [ Camshaft Timing Chain ] Camshaft Timing Chain.

Cylinder bank 1 (right):

- Follow sequence - 1 to 20 - when loosening cylinder head bolts.





• Arrow points in direction of travel.

Cylinder bank 2 (left):

- Follow sequence - 1 to 21 - when loosening cylinder head bolts.





• Arrow points in direction of travel.

Continuation for both cylinder banks:

- Carefully remove cylinder head.

Installing

• Replace cylinder head bolts.

• Always replace self-locking nuts, bolts which have been tightened to tightening specifications as well as gaskets and O-rings.

• Carefully remove residual sealant from cylinder head and cylinder block. Make sure that no long scrapes or scratches result.

• Carefully remove all grinding and sanding residue.

• There must be no oil or coolant in the blind holes for the cylinder head bolts in the cylinder block.

• Only unpack new cylinder head gasket immediately prior to installation.

• Handle gasket carefully. Damage in silicon layer and recessed area lead to leakage.

• When replacing the cylinder head or cylinder head gasket, coolant must be completely replaced.

Installation is in reverse order of removal, note the following:





- Before installing cylinder heads, position crankshaft and camshafts to TDC ignition timing mark:

• The camshaft bar (T10068) must engage in both shaft grooves.

• Crankshaft holder (3242) must be screwed in.





- Install new cylinder head gasket.





• Pay close attention to centering bushings - arrows - in cylinder block.

• Pay attention to installation position of cylinder head gasket, marking "oben" (top) or part number must face toward cylinder head.

- Install cylinder head.

- Insert new cylinder head bolts and tighten by hand.

• Allocation: The short bolts are installed on the outside.

- Tighten cylinder head bolts in 4 stages in the tightening sequence shown as follows:

- Using torque wrench, tighten to 30 Nm.

- Using torque wrench, tighten to 50 Nm.

- With a rigid wrench, 90° (1/4 turn) additional turn.

- With a rigid wrench, 90° (1/4 turn) additional turn.

• There is no requirement to retighten the cylinder head bolts after repairs.

Tightening sequence cylinder bank 1 (right):





• Arrow points in direction of travel.

Tightening sequence cylinder bank 2 (left):





• Arrow points in direction of travel.

The rest of the installation is in reverse order of removal, note the following:

- Install camshaft timing chains Camshaft Timing Chain.

- Install cylinder head covers => [ Installing ] Service and Repair.

- Install intake manifold lower-section => [ Intake Manifold Lower-Section ] Intake Manifold Lower-Section.

- Install intake manifold upper-section => [ Intake Manifold Upper Section ] Cylinder Head, Valvetrain.

- Install drive plate => [ Drive Plate ] Drive Plate.