Subaru Forester

1997-2005 of release

Repair and car operation

Subaru Forester
+ Cars Subaru Forester
+ The maintenance instruction
+ Routine maintenance
+ The engine
+ Systems of cooling, heating
+ The power supply system and release
+ Engine electric equipment
- Control systems of the engine
   System of onboard diagnostics (OBD) - a principle of functioning and codes of malfunctions. Signals in management chains
   ЕСМ - the general information, an estimation of a condition and replacement
   Information gauges, the relay and actuation mechanisms - the general information
   System of catching of fuel evaporations (EVAP)
   System recycling the fulfilled gases (EGR)
   System of operated ventilation картера (PCV)
   The conductor of a jellied mouth of a fuel tank
   The Katalitichesky converter - the general information, check of a condition and replacement
+ Gear change box
+ Coupling, трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


System of operated ventilation картера (PCV)

The general information

Function chart of system of operated ventilation картера (PCV)

1  — the  Air inlet
2  — the  Delivery chamber of an air path
3  — the  throttle Case
4  — the  Inlet pipeline
5  —  Valve PCV
6  —  Carter of the engine
7  — the  valve Case
8  — the  Valve
9  — the  Spring


System PCV serves for issue decrease in atmosphere of hydrocarbonic connections at the expense of a conclusion from the engine картерных gases. The block purge is carried out by prorace of fresh air arriving from an air cleaner through картер in which it mixes up with the collected evaporations and broken of chambers of combustion by gases and deduced through valve PCV in the inlet pipeline.

Valve PCV, tightly closed cover of a jellied mouth of impellent oil, air inlet and the complete set of connecting vacuum hoses concern number of the basic components of system.

For the purpose of maintenance of stability of turns of idling valve PCV blocks a purge stream at deep depression in the inlet pipeline. In case of infringement of serviceability of functioning of the engine (as, for example, at wear process of piston rings) the system makes surplus tap картерных gases through a ventilating tube back in an air cleaner and their reburning in combustion chambers.

Receipt картерных gases in the engine is carried out through the case of a throttle which starts to become covered in due course by tarry adjournment, in particular around an arrangement throttle заслонки. In view of told, it is necessary to make cleaning of the case of a throttle from time to time.


Principle of functioning of valve PCV

1  — an  air inlet Sleeve
2  — the  Inlet pipeline
3  —  Valve PCV
4  —  Carter of the engine



1. Attentively examine on presence of signs of development of leaks all hoses and штуцерные connections of path PCV. By a purge check up passableness of hoses.
2. Estimate reliability of landing of a cover of a jellied mouth of impellent oil, whether check up there are no signs of development of leaks through its lining.
3. Disconnect a vacuum hose from valve PCV.
4. Remove the valve and carefully it wipe.
5. Shake valve PCV, - serviceable assemblage at stirring should publish a crash, - in case of need make replacement.
6. The principle of functioning of valve PCV is explained on an accompanying illustration. Start the engine on single turns and press a finger to an aperture in the valve, - in assemblage depression should take place. If depression is not felt, at first check up passableness of a vacuum hose, then (if the hose is perfectly in order) replace the valve.

Valve PCV - the general information and replacement

Functioning principle

Valve PCV site показанои

As already it was told above, the system of operated ventilation картера (PCV) serves for issue prevention in atmosphere картерных gases. The problem dares by means of installation in the inlet pipeline of special valve PCV.

At partial opening throttle заслонки картерные gases (through valve PCV) and filtered air are soaked up directly in the inlet pipeline by deep depression created in it. At completely opened заслонке when depth of depression in the pipeline is insignificant, the part картерных gases goes to an air cleaner and then are soaked up in the engine through the throttle case.

Principle of functioning of system PCV

1  — an  air inlet Sleeve
2  — the  throttle Case
3  —  Valve PCV
4  — the  Head of cylinders
5  — the  Block of cylinders




1. Disconnect from valve PCV the hose brought to it.
2. Having turned the valve counter-clockwise, take it from the landing nest in the inlet pipeline.
3. Installation is made upside-down. Track, that the valve has been tightened with demanded effort (20 35 Nanometers), do not forget to connect a vacuum hose.
4. Having pulled vertically upwards, take the valve from the rubber landing plug. Estimate a plug condition, in case of need make replacement.
5. If the valve is hammered by tarry adjournment, the probability of infringement of passableness of a connecting hose is not excluded also, - remove a hose and wash out its solvent.
6. Having washed out a hose, check up it on presence of signs of ageing of a material and mechanical damages. Track reliability of fixing of a hose on reception unions.
7. In case of need make valve PCV replacement.