11 12 105 Removing And Installing Left Cylinder Head (N62 To 9/03)

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

(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. See 18 40 020 REMOVING AND INSTALLING/REPLACING RIGHT EXHAUST MANIFOLD (N62, N62TU) .

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.

Tighten drain plug. Tightening torque. See ENGINE - TIGHTENING TORQUES -- ALPINA .

Top up coolant. Vent cooling system and check for leaks. See 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR LEAKS (N62, N62TU) .

Remove ignition coils on cylinder bank 5 to 8.

Remove servomotor for left eccentric shaft. See 11 37 022 REMOVING AND INSTALLING/REPLACING SERVOMOTOR FOR LEFT ECCENTRIC SHAFT (N62/N62TU) .

Remove left cylinder head cover. See 11 12 005 REMOVING AND INSTALLING/SEALING LEFT CYLINDER HEAD COVER (N62/N62TU) .

Remove intake air manifold. See 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (N62) .

Remove left timing case cover. See 11 14 080 REMOVING AND INSTALLING TOP LEFT TIMING CASE COVER (N62/N62TU) .

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).

E65 only:

Release screws (3).

Remove tube (4) with check valve (2).

Fig 1: Identifying Hose On Check Valve

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Do not remove guide tube (5) for oil dipstick.

Installation:

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

Removal:

Removal of cylinder head is described separately from installation.

Remove inlet and exhaust adjustment unit on left side. See 11 36 047 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS ON LEFT SIDE (N62/N62TU) .

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: Identifying 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

Courtesy of BMW OF NORTH AMERICA, INC.

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

Release screw.

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

Fig 4: Identifying Spring Mount

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Illustration with engine removed.

Remove eccentric shaft sensor (2).

Fig 5: Identifying Eccentric Shaft Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Detach guide rail from cylinder head.

Fig 6: Identifying Guide Rail Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws between cylinder head and timing case cover.

Fig 7: Identifying 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: Left Cylinder Head Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

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

Remove cylinder head bolt (7).

Fig 9: Identifying Cylinder Head Bolt

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 10: Rotating Eccentric Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

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 (refer to BMW Parts Service).

Fig 11: Identifying Joint Between Engine Block And Timing Case Cover

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fit new cylinder-head seal.

Fig 12: Identifying Dowel Sleeves

Courtesy of BMW OF NORTH AMERICA, INC.

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: Left Cylinder Head Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

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

Insert cylinder head bolt (7).

Fig 14: Identifying Cylinder Head Bolt

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

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. See Fig 16.

Tightening torque. See ENGINE - TIGHTENING TORQUES -- ALPINA .

Fig 16: Left Cylinder Head Bolts Tightening/Loosening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Courtesy of BMW OF NORTH AMERICA, INC.

Insert and tighten down guide rail screw.

Fig 18: Identifying Guide Rail Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Replacement:

Release screw (1).

NOTE: Illustration shows (cyl. 1-4).

Fig 19: Identifying Screw Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Grip at dihedron and release screw (1).

Convert lever (2) with roller.

IMPORTANT: Levers (2) with rollers of cylinders 1 to 4 and 5 to 8 are different and must not be mixed up.

Fig 20: Identifying Convert Lever With Roller

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 21: Identifying 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 22: Identifying 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 23: Rotating Eccentric Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Illustration with engine removed.

Install eccentric shaft sensor (2).

Fig 24: Identifying Eccentric Shaft Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Install inlet and exhaust adjustment unit on left side. See 11 36 047 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS ON LEFT SIDE (N62/N62TU) .

Assemble engine.