Pic. 2.218. Forced crankcase ventilation system
Removal, check and installation of the valve of compulsory ventilation of a crankcase
Disconnect the vent hose from the positive crankcase ventilation valve. Remove the valve from the cylinder head cover and connect it to the ventilation hose.
Pic. 2.219. Intake Manifold Vacuum Check
Start the engine and let it run at idle. Close the valve opening with your finger and check that you can feel the presence of vacuum from the intake manifold (pic. 2.219).
Note. At this point, the positive crankcase breather valve plunger will move back and forth.
Examination
Remove the crankcase ventilation valve.
Insert a thin rod into the PCV valve from the threaded side, and by moving the rod back and forth, check that the plunger moves.
Pic. 2.220. Checking the plunger of the positive crankcase ventilation valve
If the plunger does not move, there is a build-up in the positive crankcase ventilation valve (pic. 2.220). In this case, it is necessary to clean or replace the valve.
Installation
Reinstall the positive crankcase ventilation valve and tighten to specification.
The moment of an inhaling of the valve of compulsory ventilation of a crankcase: 8–12 Н·м.
Operation of the positive crankcase ventilation valve
Pic. 2.221. Scheme of operation of the forced crankcase ventilation valve
The operation diagram of the forced crankcase ventilation valve is shown in fig. 2.221.