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. 144 CRANKCASE VENTILATION HOSE (TURBO ONLY):

Crankcase ventilation hose:
If the crankcase ventilation hose kinks, positive pressure is formed in the crankcase. This impedes oil return from the turbo-charger which may cause oil to leak from the turbocharger shaft seals.
It is important to check that the hose is not kinked at the nipple on the oil trap, next to the cold start injector, or between the fuel line and the line elbow.

To fix kinked hose:
1. Cut the insulating hose to half the diameter of the hose at an angle of 45°. Fig. 144.
2. Press the crankcase ventilation hose up to the bead in the pipe. Install the insulating hose on the crankcase ventilation hose so that it fits tightly against the pipe.
3. Pull the crankcase ventilation hose over the cold start injector.