11 12 729 Checking cylinder head for water leaks (N74)

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Necessary preliminary tasks:

NOTE: Set of special tools 11 6 221 can be used for cylinder bank 1 to 6 and cylinder bank 7 to 12.

Position special tool 11 6 221 on cylinder head.

Fig 1: Positioning Special Tool 11 6 221 On Cylinder

G08469100

Courtesy of BMW OF NORTH AMERICA, INC.

Special tool 11 6 222 allows the original cylinder head bolts (1) to be used to secure the pressure plate 11 6 221 .

Fig 2: Securing Cylinder Head Bolts To Pressure Plate Using Special Tool 11 6 222

G08469101

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 3: Cylinder Head Bolts Tightening/Loosening Sequence

G08469102

Courtesy of BMW OF NORTH AMERICA, INC.

Insert special tool 11 8 083 and tighten in sequence (1 to 14) in several steps.

Tightening torque: 15 Nm

Remove bleeder screw (1).

Tightening torque: see 8AZ in 11 12 CYLINDER HEAD WITH CYLINDER HEAD COVER

Installation:

Replace sealing ring.

Fig 4: Identifying Bleeder Screw

G06178423

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Max: 0.8 Nm.

Screw in special tool 11 8 082 with suitable tool and special tool to 0.8 Nm.

Connect compressed air hose with pressure gauge.

Immerse cylinder head in a water bath. Test pressure: 3.0 bar.

Check cylinder head for escaping air (cracks).

NOTE: Illustration shows N63.

Fig 5: Screwing Special Tool 11 8 082

G06178424

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: If necessary, add cleaning agent to water bath.

Assemble engine.