11 12 105 Removing and installing left cylinder head (N74)

Necessary preliminary tasks: 

• Check TIMING 
• Remove left INTAKE AND EXHAUST CAMSHAFT ADJUSTER 

Release bolt (1) on top guide rail.

Fig 1: Identifying Top Guide Rail Bolt

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Release screws (1) and remove chain tensioner (2).

Fig 2: Removing Chain Tensioner

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Release cylinder head screws at front of cylinder head.

Fig 3: Identifying Chain Tensioner Arm

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Fig 4: Cylinder Head Bolts Tightening/Loosening Sequence

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Release cylinder head bolts in sequence (14 to 1).

Remove all cylinder head bolts with washers.

Remove cylinder head with assistance of a second person (weight approx. 30 kg).

Remove ventilation line with cylinder head.

Clean sealing faces of cylinder head and engine block; if necessary, remove gasket debris compound with special tool 11 4 470 . Make sure no gasket remnants drop into oil and cooling channels.

Fig 5: Locating Sealing Face Of Cylinder Head

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Threaded bores in engine block must be free of dirt and oil

Check CYLINDER HEAD  for leaks.

Check CYLINDER HEAD SEALING FACE  for surface evenness.

Coat joint between engine block and timing case cover with Drei Bond 1209  (refer to BMW Parts Service).

Fig 6: Locating Drei Bond Applying Area

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

Installation: 

Replace cylinder head gasket  .

Fit new cylinder-head seal.

Fig 7: Identifying Dowel Sleeves

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Fig 8: Cylinder Head Bolts Tightening/Loosening Sequence

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Installation: 

Join tensioner rails together using appropriate tool and insert timing chain.

Fit cylinder head with ventilation line.

Do not wash off bolt coating.

Fit new cylinder head screws  .

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

Tighten down cylinder head bolts in sequence 1 - 14.

Tightening torque: see 1AZ in 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER

To make it easier to check angle tightening, mark all collar bolts M11 using an oil-proof marker pen (see illustration).

Fig 9: Identifying Mark On Collar Bolt

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

Tightening torque: see 2AZ in 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER

Fig 10: Identifying Chain Tensioner Arm

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Insert screw (1) of guide rail and tighten down.

Tightening torque: see 5AZ in 11 31 CAMSHAFT

Fig 11: Identifying Top Guide Rail Bolt

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If necessary, install camshafts. See LEFT INTAKE CAMSHAFT  and LEFT EXHAUST CAMSHAFT .

Install left INTAKE AND EXHAUST ADJUSTMENT UNITS .

Assemble engine.