1. The crankcase ventilation system directs gases that have escaped from the combustion chambers into the crankcase through a valve into the intake manifold so that they enter the cylinders again and burn there in the usual way. The system includes a hose connecting the valve body to the intake manifold and a hose connecting the air cleaner to the valve cover.
2. The ventilation valve is located in the cover of the valve mechanism (pic. 21.2).
3. With the engine warm and idling, pull the valve together with the hose from the valve cover.
4. Close the opening of the valve or hose with your finger (pic. 21.4). If the finger does not feel vacuum, check for a blockage in the hose, manifold inlet, or valve. Replace clogged hose.
5. Stop the engine and shake the valve - it should make a knock. If there is no knock, then the valve is faulty and must be replaced.
6. To replace the valve, simply pull it out of the hose (remember which side it was inserted).
7. When purchasing a new valve, make sure it is suitable for your engine. Compare the new valve with the old one to make sure they are the same.
8. Insert the valve into the hose,
9. Check rubber hoses and bushings for damage and hardening. Replace them if necessary
10. Replace valve with hose. Learn more about the crankcase ventilation system see chapter 6.