Positive Crankcase Ventilation: Service and Repair

Fig. 144 CRANKCASE VENTILATION HOSE (TURBO ONLY):

Crankcase ventilation hose:
An incorrectly installed crankcase ventilation hose can result in starting problems (the air flow sensor plate does not lift).
If the crankcase ventilation hose kinks, a positive pressure is formed in the crankcase. This blocks the oil return from the turbo-charger which in turn causes oil to leak onto the turbo-charger shaft seals.
It is therefore 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.

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.

Fig. 145 OIL-TRAP DRAIN HOSE:

Oil drain hose:
If the drain hose is incorrectly installed or if it is to short (outlet must be below oil level), it's possible that the crankcase ventilation will not function. The hose may also hit the crankshaft and could get damaged. Fig. 145.

Fig. 146 OIL-TRAP DRAIN HOSE:

When the oil trap is being removed, make sure that the drain hose does not come up as well. If drain hose needs to be replaced or serviced, the oil pan must be removed to make sure that the hose is in the correct position when installed. Fig. 146.