BMW 7 Series: Checking Cylinder Head For Watertightness (N63)

Necessary preliminary work

• Remove LEFT CYLINDER HEAD.
• Remove RIGHT CYLINDER HEAD.
• Remove ALL VALVES.

NOTE: Set of special tools 11 8 080 can be used for cylinder bank 1 to 4 and cylinder bank 5 to 8.

Position special tool 11 8 081 on cylinder head.

Fig. 44: Positioning Special Tool 11 8 081 On Cylinder Head

Insert special tool 11 8 083 and tighten in sequence (1 to 10) in several steps.

Tightening torque: 25 Nm

Fig. 45: Identifying Special Tool 11 8 083 Tightening Sequence

Remove vent screw (1).

Tightening torque: 11 12 8AZ.

Installation note: Replace sealing ring.

Fig. 46: Identifying Vent Screw

IMPORTANT: Max: 0.8 Nm.

Check cylinder head for escaping air (cracks).

Fig. 47: Identifying Special Tool 11 8 082 Location

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

Assemble engine.

GRINDING CYLINDER HEAD SEALING SURFACE (N63)

Necessary preliminary work

• Remove cylinder head. See LEFT CYLINDER HEAD and RIGHT CYLINDER HEAD.

Cylinder head disassembled

Check evenness of cylinder head lower face with a standard straightedge (1).

NOTE: Maximum deviation from flatness: longitudinal 0.10 mm.

Fig. 48: Checking Evenness Of Cylinder Head Lower Face With Standard Straightedge - Longitudinal

NOTE: Maximum deviation from flatness: transversal 0.05 mm.

Fig. 49: Checking Evenness Of Cylinder Head Lower Face With Standard Straightedge - Transversal

NOTE: A cylinder head gasket (+REP) 0.3 mm thicker than usual can be obtained for machined (resurfaced) cylinder heads.

Fig. 50: Identifying Cylinder Head Gasket (+REP)

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