Positive Crankcase Ventilation: Testing and Inspection

Crankcase ventilation, check

Operation number: 25702

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






Carry out checks at idle with the engine at operating temperature corresponding to 15 minutes normal driving (100 °C). If the oil quality/type and/or oil filter condition cannot be determined, replace the oil and filter.




Switch of the AC and other electrical equipment.
Reset the manometer using the adjuster screw.
Remove the dip stick.
999 7226 Pressure gauge 999 7226 Pressure Gauge




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 checked further.