Measuring The Pressure In The Crankcase

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Fig 1: Identifying Manometer, Dipstick And Tube

Courtesy of VOLVO CARS OF NORTH AMERICA.

NOTE:

Take readings at idle at operating temperature.

Warm up the engine until the thermostat opens.

Switch of the AC and other electrical equipment.

Reset the manometer using the adjuster screw.

Remove the dip stick and connect manometer 9997226 as illustrated.

Fig 2: Identifying Manometer Pressure Value

Courtesy of VOLVO CARS OF NORTH AMERICA.

NOTE:

The pressure values are given for sea level. High levels can reduce the reading slightly.

Read off manometer value.

The value for a clean crankcase ventilation is -0.2 kPa or lower.

If the manometer indicates a value from -0.2 up to 0.0 kPa or a positive value, the crankcase ventilation is partially or completely blocked and must be cleaned. See Crankcase Ventilation, Cleaning