11 12 105 Removing And Installing Left Cylinder Head (N73)

Special Tools Required: 

• 00 9 120
• 11 7 270

Cylinders 7 to 12.

Necessary Preliminary Tasks: 

• Drain coolant. Refer to 17 00 005 DRAINING AND ADDING COOLANT (N73) .
• Drain engine oil. Refer to 00 00 610 ENGINE OIL SERVICE (N73) .
• Remove left exhaust manifold. Refer to 18 40 010 REMOVING AND INSTALLING/REPLACING LEFT EXHAUST MANIFOLD (N73) .
• Remove intake air manifold. Refer to 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (N73) .
• Remove left cylinder head cover. Refer to 11 12 005 REMOVING AND INSTALLING/SEALING LEFT CYLINDER HEAD COVER (N73) .
• Remove left timing case cover. Refer to 11 14 080 REMOVING AND INSTALLING TOP LEFT TIMING CASE COVER (N73) .
• Remove inlet and exhaust adjustment unit on left side. Refer to 11 36 047 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST VANOS ON LEFT SIDE (N73) .
• Detach water hose (vent hose) from cylinder head.

Remove screw connection (1) from Valvetronic drive with special tool 11 7 270.

Remove worm drive (2) in direction of arrow.

Fig 1: Removing Screw Connection From Valvetronic Drive

Courtesy of BMW OF NORTH AMERICA, INC.

Adjust eccentric shaft to max. stroke and pretension tensioning spring (1) with a cable tie (2).

Feed tensioning spring (1) out from roller (3) and carefully relieve tension.

Fig 2: Identifying Tensioning Spring (Left Cylinder Head Cover)

Courtesy of BMW OF NORTH AMERICA, INC.

Reset eccentric shaft to minimum stroke.

Fig 3: Adjusting Eccentric Shaft (Left Cylinder Head Cover)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw connection on tensioning spring (1) and remove towards top.

Fig 4: Locating Screw Connection On Tensioning Spring (Left Cylinder Head Cover)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw connection on eccentric shaft sensor (2) and remove.

Installation: 

Tightening torque, refer to 11 37 1AZ in ENGINE - TIGHTENING TORQUES .

Fig 5: Releasing Release Screw Connection On Eccentric Shaft Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Detach guide rail from cylinder head.

Fig 6: Detaching Guide Rail From Cylinder Head

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw for oil lines (1) and unclip from holders.

Release cylinder head bolts (2) on timing case cover.

Release cylinder head bolts (3) along line (4) from outside to inside.

Fig 7: Releasing Cylinder Head Bolts (Left Cylinder Head Cover)

Courtesy of BMW OF NORTH AMERICA, INC.

Coat gap (1) between engine block and timing case cover with Drei Bond 1209 liquid sealant.

Check adapter sleeves (2) for damage and correct installation position, replace if necessary.

Installation: 

All bores and blind holes must be free of oil and coolant. If necessary, blow clean with compressed air.

Install new cylinder head gasket. Refer to 11 12 110 REPLACING LEFT CYLINDER HEAD GASKET (N73) .

Fig 8: Locating Sealant Applying Area (Left Cylinder Head Cover)

Courtesy of BMW OF NORTH AMERICA, INC.

Put the cylinder head on.

Install cylinder head bolts with washers and initially tighten without play.

Tighten down cylinder head bolts with special tool 00 9 120 in sequence 1 to 14.

Installation: 

Tightening torque, refer to 11 12 8AZ in ENGINE - TIGHTENING TORQUES .

Fig 9: Tightening Cylinder Head Bolts In Sequence (Left Cylinder Head Cover)

Courtesy of BMW OF NORTH AMERICA, INC.

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

Installation: 

Tightening torque, refer to 11 14 1AZ in ENGINE - TIGHTENING TORQUES .

Fig 10: Locating Screws Between Cylinder Head And Timing Case Cover (Left Cylinder Head Cover)

Courtesy of BMW OF NORTH AMERICA, INC.

Adjust valve timing. Refer to 11 31 573 ADJUSTING CAMSHAFT TIMING ON LEFT SIDE (N73) .

Install engine in reverse sequence to its removal.

Installation: 

Coat all bearings and cams of camshafts with engine oil.