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Systems for reducing emissions

PCV

Arrows indicate the direction of flow of the gases in the crankcase, crankshaft, which is finally flows through a control valve and is sucked again. The white arrows indicate the flow of fresh air, black arrows indicate the flow of crankcase gases

1 - control valve 2 - steel mesh 3 - Filter

With this system, crankcase gases are sucked through the intake manifold and air filter back. The system has a valve (1) (see. Figure above) to recover the gases from the crankcase back into the intake conduit. The required ventilation air is sucked through the air filter and the carburetor through a connected between the air filter and cylinder head cover hose at the top of the cylinder head and is fed from there to the crankcase.

At full load, the vacuum in the intake pipe is sufficient to drain through the valve and gas tube in the opposite direction.

To ensure correct operation of the ventilation system following work must be performed every 20,000 km.

The system of petrol vapor recovery

The system of petrol vapor. The black arrows show the flow of the engine is running, the white arrows indicate the flow on the idle engine

1 - thermal vacuum valve 2 - engine coolant 3 - vacuum line 4 - float chamber 5 - throttle valve 6 - the manifold 7 - the vacuum pipe 8 - adsorption with activated charcoal	9 - pipeline canister purge 10 - vent switching valve 11 - pipeline venting gasoline 12 - a ventilation control valve 13 - vent hole 14 - the fuel tank 15 - a cover of the tank with a vacuum relief valve

This system serves to reduce the amount of power system superseded harmful vapors that pass through the adsorber with activated carbon. The illustration above shows a system diagram which shows how the individual elements are connected to each other.

When the engine is off, the fuel vapors are fed from the sealed fuel tank filled with activated carbon adsorber and accumulate there. Located in the float chamber of the carburettor and petrol fumes are discharged through an external vent line to the adsorber, as the vent valve is opened in a normal situation. When the engine is running, gasoline fumes remain in adsorber with charcoal until they begin again assigned to the inlet conduit by pumping air through the vent line. With increasing speed also increases the vacuum and opens the vent control valve that allows fuel vapors to return back to the intake manifold. If the engine temperature is less than 70 ?� C, the vent valve is closed by thermal vacuum valve and this interrupts the gasoline vapor to the inlet pipeline. Ventilation control valve controls the flow of ventilating air relative to the amount of intake air. If you need to remove the parts of the system, we must first remember how to connect the individual tubes, especially in the adsorber, so they can be installed in the same position.

Exhaust gas return system

Exhaust gas return system

1 - vacuum throttle 2 - control valve exhaust gas pressure	3 - return valve exhaust gases 4 - temperature vacuum valve

This system diverts part of the exhaust gas into the combustion chamber to reduce emitted during the combustion process harmful gases. Control valve regulates the amount of returning gas from the exhaust manifold to the intake, depending on the vacuum in the carburettor. The illustration above shows a diagram of the system. Exhaust gas return valve controls the amount of gas that can enter again into the intake pipe, wherein disposed on the membrane valve can be closed and opened. The membrane is actuated vacuum which is obtained by opening and closing the throttle valve of the carburetor.

On the right side of the intake pipe temperature is a vacuum valve. The valve reacts to the temperature of the cooling fluid and opens or closes the suction opening in the valve. If the hole is open, a vacuum is supplied to the carburetor diaphragm valve return exhaust gases and actuates seated in a conical valve seat. Near the exhaust gas return valve is another control valve which monitors the pressure of the exhaust gas to actuate a membrane which carries the vacuum in the carburetor to the exhaust gas return valve.

Exhaust gas return system must be faulty. Hoses should not be torn or damaged. On the engine off valve diaphragm return exhaust gas can move your finger from the bottom up and down. It should move easily. All other verification work must be carried out in the workshop, as well as can be damaged by thermal vacuum valve, pressure control valve exhaust gases and so on. D.