11 12 729 Checking Cylinder Head for Watertightness (N63)

Special Tools Required:

Necessary Preliminary Tasks:

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

Fig 2: Cylinder Head Bolts Tightening/Loosening Sequence (N63)

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Remove Vent Screw (1).

Tightening torque: 11 12 8 AZ .

Installation Note:

Replace Sealing Ring.

Fig 3: Identifying Vent 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 To 0.8 Nm.

Connect Compressed Air Hose with Pressure Gauge.

Immerse Cylinder Head In A Water Bath. Inspection Pressure 4.0 Bar.

Check Cylinder Head for Escaping Air (Cracks).

Fig 4: Installing Special Tool 11 8 082 Using Suitable Tool

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NOTE: If Necessary, Add Cleaning Agent To Water Bath.
Assemble Engine.