Cleaning the crankcase ventilation system (Priora 2170)

Over time, resinous deposits from crankcase gases accumulate in the engine's crankcase ventilation system, making it difficult for these gases to be removed into the engine cylinders for combustion. Because of this, the gas pressure inside the engine increases and oil leaks appear through the seals. To avoid this, clean and flush the system periodically.

According to the manufacturer's recommendation, the engine crankcase ventilation system must be cleaned every 60 thousand km.

Note: Clean the crankcase ventilation system before each oil change.

You will need: an 8 mm spanner, a Phillips-head screwdriver, and narrow-nosed pliers.

1. Remove the decorative engine cover (see "Removing and installing the decorative engine cover").

2. Remove the air filter (see "Removing and installing the air filter").



3. Loosen the clamp..



4. …and disconnect the large branch hose of the crankcase ventilation system from the air supply hose.





5. Loosen the clamp..



6. …and disconnect the air supply hose from the throttle assembly.



7. After loosening the clamp, disconnect the large branch hose of the crankcase ventilation system from the cylinder head cover and remove it.



8. Similarly, remove the small branch hose of the crankcase ventilation system by disconnecting it from the throttle assembly fittings and the cylinder head cover.





9. Loosen the clamp..



10. …and remove the ventilation system supply hose by disconnecting it from the cylinder head cover pipe…



11. …and similarly from the cylinder block nipple.

12. Wash the hoses with gasoline or kerosene, blow with compressed air and dry. Clean the holes of the fittings and pipes for connecting the hoses.



13. Remove the cylinder head cover (see "Replacing the cylinder head cover gasket").



14. Remove the six bolts securing the separator from the inside of the cylinder head cover…



15. ...and remove the separator.



16. Use pliers to squeeze the separator oil deflector clamps…



17. …and remove the oil deflector from the oil separator.





18. Carefully pry up the rubber sealing ring with a screwdriver...



19. ...and take it off. If the ring is too compressed or has lost its elasticity, replace it with a new one.

Note: Clean the cylinder head cover before installing it (from old sealant) and degrease the mating surfaces of the cylinder head and cylinder head cover. Apply a thin layer of sealant to the mating surface of the cylinder head.

20. Install the hoses and parts in the reverse order of removal.