Positive Crankcase Ventilation: Testing and Inspection

Fig. 87 POSITIVE CRANKCASE VENTILATION SYSTEM:

Check hoses, nipple and flame guard for condition and clogging. This can be performed by visual inspection of each individual component. Fig. 87.

Fig. 105 BLOCKED P.C.V. SYSTEM (NON TURBO ONLY):

A blocked flame trap will cause the crankcase ventilation system to malfunction and result in high crankcase pressure. Fig. 105.

Symptoms are:
- oil dipstick "jumps out" of the pipe
- oil leakage at the seals in the cylinder block
- seals must not always be replaced if they are leaking due to a blocked flame trap. Fix the flame trap, clean the engine and check if seals are still leaking or not.
- the engine knocking (change to a new flame trap if necessary, see "COMPONENT REPLACEMENT AND REPAIR PROCEDURES")

Reasons for a blocked flame trap may be:
-too long intervals between engine oil changes
-the engine oil used is of poor quality