11 12 100 Removing and installing/replacing cylinder head (M52TU / M54 / M56)

WARNING: This page is about a different car, the 2002 BMW Z3 and 2001 BMW Z3. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, see SPECIAL TOOLS - Z3 .

Special Tools Required:

00 0 200
00 9 120

Remove both exhaust manifolds. Refer to 11 62 140 REMOVING AND INSTALLING BOTH EXHAUST MANIFOLDS WITH CATALYTIC CONVERTER (M52TU / M54) .

NOTE: After removing exhaust manifolds:

Reinstall engine support arm with engine mount and remove special tool 00 0 200.

Remove intake filter housing with air-mass flow sensor.

Remove cylinder head cover. Refer to 11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56) .

Remove all spark plugs. Refer to 12 12 011 REPLACING ALL SPARK PLUGS .

Remove intake air manifold. Refer to 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (M54) .

Remove coolant drain plug in engine block. Drain and dispose of coolant.

Installation:

Replace sealing ring on drain plug.

Tightening torque, refer to 11 11 5AZ in 1`11 11 ENGINE BLOCK .

Vent cooling system and check for leaks.

Remove coolant thermostat housing. Refer to 11 53 000 REMOVING AND INSTALLING/REPLACING COOLANT THERMOSTAT (M52TU / M54 / M56) .

Remove coolant pipe.

NOTE: If the coolant pipe cannot be fed out:

Release banjo bolt (1) and disconnect oil pressure line for VANOS adjustment unit.

Fig 1: Identifying Banjo Bolt On Oil Pressure Line

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Installation:

Replace O-ring on coolant pipe.

If necessary, replace sealing rings on banjo bolt (1).

Tightening torque of banjo bolt (1) 11 36 2AZ. Refer to 11 36 VARIABLE CAMSHAFT CONTROL .

Removal

Removal of cylinder head is described separately from installation.

Remove double VANOS adjustment unit. Refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56) .

Remove camshafts with bearing strips. Refer to 11 31 001 REPLACING CAMSHAFT (M52TU / M54 / M56) .

Release screw connection between timing case cover and cylinder head.

Fig 2: Identifying Screw Connection Between Timing Case Cover And Cylinder Head

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Release screws, remove chain guide.

Fig 3: Removing Chain Guide Screws

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Release cylinder head bolts from outside to inside in sequence 14 to 1.

Fig 4: Identifying Removal Sequence Of Cylinder Head Bolts

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Lift off cylinder head.

Installation

Installation of cylinder head is described separately from removal.

Clean sealing faces of cylinder head and engine block; if necessary, remove traces of gasket with hardwood spatula. Make sure no gasket remnants drop into oil and cooling channels.

Check adapter sleeves for damage and correct installation position.

Apply permanently elastic sealing compound Drei Bond 1209 to joints to timing case cover.

Replace cylinder head gasket.

Fig 5: Checking Adapter Sleeves

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NOTE: A cylinder head seal 0.3 mm thicker than usual can be obtained for machined (milled) cylinder heads.

Fig 6: Identifying Standard And Thicker Cylinder Head Seal

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Use cylinder head bolts only once.

There must be no oil in the tapped holes of the engine block and the timing case cover.

Risk of cracking and distorted tightening values.

Put the cylinder head on.

Apply a light coat of oil to washer contact area and thread of new cylinder head bolts.

Tighten down cylinder head bolts in sequence 1 to 14.

Fig 7: Cylinder Head Bolts Tightening/Loosening Sequence

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Tightening torque 11 12 6AZ. Refer to 11 12 CYLINDER HEAD WITH COVER .

NOTE: Use special tool 00 9 120 for torsion angle tightening.

Install chain guide.

Fig 8: Installing Chain Guide

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

Install camshafts. Refer to 11 31 001 REPLACING CAMSHAFT (M52TU / M54 / M56) .

Install double VANOS adjustment unit. Refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56) .

Assemble engine.

Fig 9: Tightening Screw Connection Between Timing Case Cover And Cylinder Head

Courtesy of BMW OF NORTH AMERICA, INC.