Removing and Installing Left Cylinder Head

11 12 105 Removing and installing left cylinder head (N74)

Special tools required:





Necessary preliminary tasks:
^ Check timing
^ Remove left intake and exhaust camshaft adjuster





Release bolt (1) on top guide rail.





Important!
Chain tensioner is pre-tensioned and may only be removed with secured special tool 11 4 120.

Release screws (1) and remove chain tensioner (2).





Release cylinder head screws at front of cylinder head.





Release cylinder head bolts in sequence (14 to 1).

Remove all cylinder head bolts with washers.

Remove cylinder head with assistance of a second person (weight approx. 30 kg).

Note:
Detach ventilation line at separation point.

Remove ventilation line with cylinder head.

Note:
For purposes of clarity, the graphic shows the camshafts removed.





Clean sealing faces of cylinder head and engine block; if necessary, remove gasket debris compound with special tool 11 4 470 . Make sure no gasket remnants drop into oil and cooling channels.





Important!
Risk of cracking!
Threaded bores in engine block must be free of dirt and oil

Check cylinder head for leaks.

Check cylinder head sealing face for surface evenness.





Coat joint between engine block and timing case cover with Drei Bond 1209 (refer to BMW Parts Service).

Note:
Graphic shows an N62 engine by way of example.





Check dowel sleeves (1) for damage and correct installation position.

Installation:
Replace cylinder head gasket.

Fit new cylinder-head seal.





Installation:
Join tensioner rails together using appropriate tool and insert timing chain.

Fit cylinder head with ventilation line.

Do not wash off bolt coating.

Fit new cylinder head screws.

Insert new cylinder head bolts and initially tighten so that they are free of play.

Tighten down cylinder head bolts in sequence 1 - 14.

Tightening torque 11 12 1AZ.

Note:
For purposes of clarity, the graphic shows the camshafts removed.





To make it easier to check angle tightening, mark all collar bolts M11 using an oil-proof marker pen (see illustration).





Insert and tighten down screws between cylinder head and timing case cover.

Tightening torque 11 12 2AZ.





Insert screw (1) of guide rail and tighten down.

Tightening torque 11 31 5AZ.





If necessary, install camshafts.

Install left inlet and exhaust adjustment units.

Assemble engine.