11 11 579 Checking the crankcase for watertightness (N47D20 K/U/O/T 1)

Special tools required:

Necessary preliminary tasks:

IMPORTANT: Pressure test crankcase to maximum 3 bar.
Heat crankcase to 60 °C.
Check for formation of bubbles in a water bath.

Mount all special tools 11 8 825 on crankcase.

Fig 1: Mounting Special Tools (11 8 825) On Crankcase

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Place special tool 11 8 891 on crankcase.

Secure special tool in sequence (1 to 10).

Tightening torque: Nut (1 to 10) 8 Nm .

Fig 2: Special Tool Bolts Tightening/Loosening Sequence

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Secure special tool 11 8 821 with screw (1).

Secure special tool 11 8 822 with bolts (3).

Secure special tool 11 8 823 with bolts (2).

IMPORTANT: Maximum screw length M6x20 risk of damage! on crankcase.

Use bolts to fasten special tool 11 6 282 .

Tightening torque: screws M6x20 with 8 Nm.

Fig 3: Identifying Special Tool (11 6 282)

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Screw down special 11 6 281 tool on to sealing surface of coolant pump.

Tightening torque: screws with 8 Nm.

IMPORTANT: Maximum screw length M6x20 risk of damage! on crankcase.

Fig 4: Identifying Special Tool (11 6 281) On Coolant Pump Sealing Surface

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Release valve cap on compressed air connection.

IMPORTANT: Pressure test crankcase to maximum 3 bar.
Heat crankcase to 60 °C.
Check for formation of bubbles in a water bath.

Fig 5: Identifying Special Tool (11 6 281) On Coolant Pump Sealing Surface

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Assemble engine.