Mazda 1983 RX7 Spezifikationen PDF herunterladen (Seite 156)

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101

PCV SYSTEM

Article Text

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:59PM

ARTICLE BEGINNING

1983 Crankcase Ventilation

MAZDA

B2000, B2200, GLC, 626, RX7

DESCRIPTION & OPERATION

PISTON ENGINES

The PCV system includes 2 hoses and a PCV valve. Air

normally flows out of the valve cover hose, through the PCV valve and

into combustion chambers. A hose from the air cleaner to the valve

cover supplies fresh air to the crankcase.

When intake manifold vacuum drops due to heavy loads, the

amount of blow-by exceeds the capacity of the PCV valve. Air then

flows directly from the valve cover into the air cleaner and

carburetor. When engine is not running, the PCV valve is closed and

vapors are stored in the crankcase.

ROTARY ENGINES

The system used on the rotary engine (RX7) is also a closed

system and operates basically the same way as the piston engine

arrangement.

Filtered air is drawn into the system through the air

cleaner, mixed with the gases and vapors that blow by the rotor

during engine operation, and is drawn out through a purge valve and

into the intake manifold. The purge valve operates as the PCV valve

in this system.

DIESEL ENGINE

The PCV system on diesel engines consists of a hose to the

air intake from the cylinder head cover. All blow-by gases are

introduced into the air intake and prevented from entering the

atmosphere. There is no testing the PCV system on the diesel engines.

Hoses should be kept free of obstructions.

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