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

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Replace sealing ring.

Tightening torque of drain plug 11 11 5AZ. Refer to ENGINE - TIGHTENING TORQUES .

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

Remove ignition coils on cylinder bank 5 to 8.

Remove servomotor for left eccentric shaft. Refer to 11 37 022 Removing and installing/replacing servomotor for left eccentric shaft (N62) .

Remove left cylinder head cover. Refer to 11 12 005 Removing and installing / sealing left cylinder head cover (N62 / N62TU) .

Remove intake air manifold. Refer to 11 61 050 Removing and installing intake air manifold (N62) .

Remove left timing case cover. Refer to 11 14 080 Removing and installing top left timing case cover (N62) .

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).

Fig 1: Removing Tube With Check Valve

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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 1: Locating Joint Between Engine Block And Timing Case Cover

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

Fig 2: Checking Dowel Sleeves

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Fit new cylinder-head seal.

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 3: Inserting New Cylinder Head Bolts

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

Fig 4: Rotating Eccentric Shaft At Dihedral Head

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Insert cylinder head bolt (7).

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

Fig 5: Rotating Eccentric Shaft Back To Minimum Stroke Position

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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.

Fig 6: Left Cylinder Head Bolts Tightening/Loosening Sequence (N62)

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Tightening torque 11 12 8AZ. Refer to ENGINE - TIGHTENING TORQUES .

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

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

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Insert and tighten down guide rail screw.

Fig 8: Inserting Guide Rail Screw

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Replacement:

Release screw (1).

Fig 9: Releasing Screw

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

Grip at dihedron and release screw (1). Convert lever (2) with roller.

Fig 10: Removing Lever

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

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

Attach spring to spring mount (1).

Fig 11: Attaching Spring To Spring Mount

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

Install screw and tighten down.

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

Fig 12: Rotating Eccentric Shaft

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

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

Fig 13: Rotating Eccentric Shaft Back To Minimum Stroke Position

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NOTE: Illustration with engine removed.

Install eccentric shaft sensor (2).

Fig 14: Installing Eccentric Shaft Sensor

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Install inlet and exhaust adjustment unit on left side. Refer to 11 36 047 Removing and installing/replacing inlet and exhaust adjustment units on left side (N62) .

Assemble engine.