Mazda 1984 RX7 Spezifikationen PDF herunterladen (Seite 65)

PCV SYSTEM

Article Text

1984 Mazda RX7

For iluvmyrx7.com

Saturday, June 08, 2002 10:52PM

ARTICLE BEGINNING

1984 Crankcase Ventilation

MAZDA

B2000, B2200, GLC, RX7 & 626

DESCRIPTION & OPERATION

PISTON ENGINE MODELS

Gasoline

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

vapors are normally drawn from valve cover through PCV valve and into

intake manifold. 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.

Diesel

The crankcase ventilation system on diesel engines consists

of a breather hose connecting an upper chamber in valve cover with

air intake. Oil baffle plates are located in upper chamber of valve

cover. Blow-by gases are fed into the air intake and prevented from

entering the atmosphere. Servicing is limited to keeping breather

hose and passages free of obstructions.

Fig. 1: 626 Crankcase Ventilation System

Note direction of flow.

ROTARY ENGINE MODELS

The crankcase ventilation system on the rotary engine (RX7)

is an integral part of the fuel evaporation system. A vacuum operated

purge valve directs crankcase, fuel tank, and canister vapors into

intake manifold when the throttle is opened.

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 96 97

Keine Kommentare

Mazda 1984 RX7 Spezifikationen Seite 65