11 12 105 Removing and installing left cylinder head (N62 to 9 / 03)

WARNING: This page is about a different variant/trim than selected.

(Cylinder Bank 5 To 8)

NOTE: To remove the exhaust manifolds, the engine must be secured in the installation position with the special tool and then the front axle bracket lowered.

Remove left exhaust manifold .

After Removing Exhaust Manifolds:

Reinstall front axle bracket provisionally and remove special tool for securing engine in installation position.

Open drain plug for coolant on left side of engine block.

Drain and dispose of coolant.

Installation:

Replace sealing ring.
Tightening torque of drain plug, see ENGINE - TIGHTENING TORQUES .

Top up coolant. Vent cooling system and check for leaks.

Remove ignition coils on cylinder bank 5 to 8. See IGNITION COIL .

Remove servomotor for left eccentric shaft.

Remove left cylinder head cover .

Remove intake air manifold .

Remove left timing case cover.

Unfasten plug connection.

Place engine wiring harness to one side.

Remove spark plugs on cylinder bank 5 to 8.

Remove vent hose on cylinder head.

NOTE: Illustration with engine removed.

Detach hose (1) on check valve (2).

Installation:

Replace sealing ring on tube (4) and coat with antiseize agent.

Removal:

Removal of cylinder head is described separately from installation.

Fig 1: Removing Hose From Check Valve

Courtesy of BMW OF NORTH AMERICA, INC.

Remove inlet and exhaust adjustment unit on left side.

Rotate eccentric shaft at dihedral head as illustrated in order to reduce tension on torsion spring (1).

Pretension torsion spring (1) with a cable strap (2), feed out from roller (3) and carefully relieve tension.

Fig 2: Removing Pretension Torsion Spring With Cable Strap

Courtesy of BMW OF NORTH AMERICA, INC.

Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.

Fig 3: Rotating Eccentric Shaft At Dihedral Head

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NOTE: Spring mount (1) has a locating pin opposite screw.

Release screw.

Feed spring mount (1) upwards out of locating pin.

Fig 4: Feeding Spring Mount Upwards Out Of Locating Pin

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NOTE: Illustration with engine removed.

Remove eccentric shaft sensor (2).

Fig 5: Removing Eccentric Shaft Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Detach guide rail from cylinder head.

Fig 6: Detaching Guide Rail From Cylinder Head

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Release screws between cylinder head and timing case cover.

Fig 7: Releasing Screws Between Cylinder Head And Timing Case Cover

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: At narrow points, use a socket with 3/8" drive and a short extension.

Slacken off cylinder head bolts by one turn in sequence 10... 1.

Fig 8: Slackening Off Cylinder Head Bolts

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Rotate eccentric shaft at dihedral head as shown in illustration and hold in this position.

Remove cylinder head bolt (7).

Fig 9: Removing Cylinder Head Bolt

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Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.

Fig 10: Rotating Eccentric Shaft At Dihedral Head

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Remove remaining cylinder head bolts.

Lift off cylinder head.

Lift off cylinder head gasket.

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. Make sure no gasket debris drops into the oil and coolant ducts.

Threaded bores in engine block must be free of dirt and oil (risk of cracking).

Coat joint between engine block and timing case cover with Drei Bond 1209.

Fig 11: Coating Joint Between Engine Block And Timing Case Cover With Drei Bond 1209

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

Fit new cylinder-head seal.

Fig 12: Checking Dowel Sleeves For Damage

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Put the cylinder head on.

NOTE: Cylinder head bolt (7) cannot be inserted yet.

Do not wash off screw coating.

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

Fig 13: Inserting New Cylinder Head Bolts

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Rotate eccentric shaft at dihedral head as shown in illustration and hold in this position.

Insert cylinder head bolt (7).

Fig 14: Tightening New Cylinder Head Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.

Fig 15: Rotating Eccentric Shaft At Dihedral Head

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: At narrow points, use a socket with 3/8" drive and a short extension.

Tighten down the cylinder-head bolts in order 1... 10.

Tightening torque see ENGINE - TIGHTENING TORQUES .

Fig 16: Tightening Cylinder-Head Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 17: Tightening Screws Between Cylinder Head And Timing Case Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Insert and tighten down guide rail screw.

Fig 18: Tightening Down Guide Rail Screw

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Spring mount (1) has a locating pin opposite screw.

Attach spring to spring mount (1).

Insert locating pin of spring mount (1) into locating bore in cylinder head.

Install screw and tighten down.

Fig 19: Attaching Spring To Spring Mount

Courtesy of BMW OF NORTH AMERICA, INC.

Rotate eccentric shaft at dihedral head as illustrated in order to reduce tension on torsion spring (1).

Pretension torsion spring (1) with a cable strap (2) and carefully fit on roller (3).

Fig 20: Installing Pretension Torsion Spring With Cable Strap

Courtesy of BMW OF NORTH AMERICA, INC.

Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.

Fig 21: Rotating Eccentric Shaft At Dihedral Head

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Illustration with engine removed.

Install eccentric shaft sensor (2).

Fig 22: Installing Eccentric Shaft Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Install inlet and exhaust adjustment unit on left side.

Assemble engine.