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Air injection system
Air injection system helps reduce the content of hydrocarbons in the exhaust gases and carbon monoxide by injecting air into the outlet ports of each of the cylinders. The air injection system, air entrainment occurs during pulsed pressure increase in line with the exhaust gases. For this purpose the clean air flowing through the air filter. The system consists of a reed valve disposed on the housing of the air filter and the connecting pipes and hoses.
Technical condition A malfunction of the air injection is the reverse penetration of exhaust gases through the air filter. Always carefully check all hoses. Check for damage, contamination and leakage of all connections. A simple functional test of the system can be performed with the engine running. Remove the top cover and the air filter element.
| Fig. 8.2. Verifying the reed valve for injection of air by means of the paper
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Put a sheet of paper on the inlet reed valve, with operating temperature the engine should idle (Fig. 8.2). With the engine running at idle valve must be drawn a steady stream of air. Ask the assistant to press the accelerator pedal. As the speed of the crankshaft of the engine, observe the vacuum, which should increase. If vacuum does not increase, it indicates leaks, or that the hose is kinked or malfunction of reed valves. Increase the engine speed to 1500 min-1 and check whether there is leakage of exhaust gases at the site of the air supply hose connection. If the results of both tests is unsatisfactory, replace the reed valve.
Replacement Remove the air filter.
| Fig. 8.3. Details of the reed valve plate
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Unscrew and remove the screws that secure the housing cover plate valve lift and remove the valve and filter out of the housing (Fig. 8.3). Installation is performed in reverse order of removal.
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