11 12 729 Checking cylinder head on watertightness (N63O1)

Special tools required:

Necessary preliminary work:

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 1: Positioning Special Tool 11 8 081 On Cylinder Head

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

Tightening torque: 25 Nm .

NOTE: Illustrations shows N63 engine.

Fig 2: Cylinder Head Bolts Tightening/Loosening Sequence

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Remove bleeder screw (1).

Tightening torque: 11 12 7 AZ .

Installation note:

Replace sealing ring.

Fig 3: Identifying Bleeder Screw

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IMPORTANT: Max: 0.8 Nm.

Screw in special tool 11 8 082 with suitable tool and special tool 00 9 250, see 00 9 460 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).

Fig 4: Identifying Special Tool (11 8 082)

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