Left Cylinder Head

Left Cylinder Head Removal and Installation

(Cylinder bank 5-8)

Preparation/Finishing
Remove left exhaust manifold. Left Side
Unfasten drain plug for coolant on left engine block.
Drain and dispose of coolant.

Installation:
Replace sealing ring.
Tightening Torque, refer to Engine, Specifications.

Top up coolant. Bleeding Cooling System
Remove both cylinder head covers. Service and Repair
Remove spark plugs. Service and Repair
Remove intake air manifold. Service and Repair
Remove coolant manifold. Thermostat Housing

Removal
Removal of cylinder head is described separately from installation.
Remove left camshaft adjustment unit. Left Camshaft Adjustment Unit





Note: Pull on connecting piece (1), otherwise only the hose will slip down from the vent pipe and the connecting piece (1) will remain in the angle bracket (2).

Withdraw connecting piece (1) with vent pipe from angle bracket (2) of oil separator.





Pull special tool 11 2 300 back until flywheel is no longer secured in position.





Lift timing chain and hold under tension.

Note: Note marks.

Crank engine at central bolt against direction of rotation to 45, before TDC position.





Remove special tools 11 2 444 / 443 / 442 / 446.





Release and remove grub screw (1).

Note: The grub screw (1) secures the angle bracket (2) in the cylinder head.





Detach guide rail from cylinder head.





Release cylinder-head bolts in sequence 10 through 1
Lift off cylinder head.

Installation
Installation of cylinder head is described separately from removal.
Clean sealing faces of cylinder head and engine block, if necessary using wooden scraper to remove gasket debris. Ensure that no gasket debris drops into the oil and coolant ducts.
Threaded bores in engine block must be free of dirt and oil (danger or cracking).





Coat joint between engine block and timing case cover with Drei Bond 1209 (or equivalent).





Check that dowel sleeves are undamaged and correctly located.
Place new cylinder head gasket in position.





Put the cylinder head on. Install new cylinder head bolts. Do not wash off bolt coating.

Note: Use special tool 00 9 120 as a torsion angle bracket.





Tighten down the cylinder-head bolts in order 1 through 10.
Tightening Torque, refer to Engine, Specifications.





Insert and tighten down guide rail screw.





Align angle bracket (2) so that it snaps into place in guide on cylinder head.

Note: The grub screw (1) is secured with a plastic coating and locates the angle bracket (2) in place in the cylinder head.

Insert new grub screw (1) only until it makes contact with angle bracket (2) without play; do not tighten down.





Caution: Do not damage the cylinder head.

Rotate camshafts until camshaft markings face upwards.





Align camshafts.
Fit special tool 11 2 446 / 442 to camshafts on cylinder bank 5 to 8.





Caution: Do not damage the cylinder head.

Align camshafts with an open-end wrench so that special tools 11 2 442 / 446 rest without a gap on the cylinder head.





Fit special tool 11 2 443 to special tool 11 2 446 / 442 and secure with special tool 11 2 444 using the spark plug thread.
Lift timing chain and hold under tension.
Crank engine from the 45, before TDC position in direction of rotational up to TDC position.
Hold crankshaft in TDC position with special tool 11 2 300.

Caution: Remove special tool 11 2 300 before starting engine.
Note: X5 (E53) uses special tool # 11 5 180.






Caution: Any leakage in the area of the engine breather will result in heavy oil loss and engine damage.

Make sure that hose connection between vent pipe and connecting piece (1) does not slip and is not leaking. Replace sealing rings on vent pipe (1) and on angle bracket (2). Apply a thin coat of grease to sealing rings.
Insert vent pipe (1) in angle bracket (2).

Remove left camshaft adjustment unit. Left Camshaft Adjustment Unit
Assemble engine.