ENGINE   113.986 ENGINE   113.987 ENGINE   113.988 ENGINE   113.989

126/1 Left aspirator shutoff valve 126/2 Right aspirator shutoff valve For each cylinder head, an aspirator shutoff valve with integral check valve is located at the front of the engine. Task When air pump is switched off, the aspirator shutoff valves prevent air being inducted into the exhaust ports, as a result of the flow of the exhaust gases.
		P14.30-2115-11

Function 126a Vacuum diaphragm 126b Check valve a Air to air pump switchover valve (vacuum build up) b Injected air from the air pump c Injected air to cylinder head The aspirator shutoff valves are opened via the air pump switchover valve (Y32) through vacuum or closed through ventilation. The injected air to the electrical air pump (M33) can thus flow through when the aspirator shutoff valves are actuated. When air injection is off, the check valve prevents the admission of exhaust gas in the vacuum diaphragm and thus protects these from dirt and thermal destruction.
		P14.30-2094-81