Positive Crankcase Ventilation: Testing and Inspection

Crankcase ventilation, check

Note! Some variation in the illustrations may occur, but the essential information is always correct.

Special tools:
999 7226 Pressure gauge

Check

Measuring the pressure in the crankcase





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 999 7226 Pressure gauge as illustrated.





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. Refer to: Crankcase ventilation, cleaning Crankcase Ventilation Cleaning