Component description of aspirator shutoff valve with integral check valve - GF14.30-P-2100V

ENGINE 272.920 in MODEL 203 up to Model Year 8

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203 up to Model Year 8

ENGINE 272.941 in MODEL 203 up to Model Year 8

ENGINE 272.942 in MODEL 171 up to Model Year 8

ENGINE 272.943 in MODEL 211, 219

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251 up to Model Year 8

ENGINE 272.946 in MODEL 221 up to Model Year 8

ENGINE 272.960 in MODEL 203 up to Model Year 8

ENGINE 272.963 in MODEL 171 up to Model Year 8

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221 up to Model Year 8

ENGINE 272.966 in MODEL 230 up to Model Year 8

ENGINE 272.967 in MODEL 164, 251 up to Model Year 8

ENGINE 272.970 in MODEL 203 up to Model Year 8

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221 up to Model Year 8

ENGINE 273.922 in MODEL 221 up to Model Year 8

ENGINE 273.923 in MODEL 164 up to Model Year 8

ENGINE 273.924 in MODEL 221 up to Model Year 8

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251 up to Model Year 8

ENGINE 273.965 in MODEL 230 up to Model Year 8

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221 up to Model Year 8

ENGINE 272.940 in MODEL 209

ENGINE 272.960 in MODEL 209

Shown on ENGINE 272

Fig 1: Electric Air Pump Flow Diagram

Courtesy of MERCEDES-BENZ USA

Location

The air shutoff valves are located between the electrical air pump and the respective cylinder head.

Task

Opens up the route during air injection for the injected air. When air pump is switched off, preventing air being inducted into the exhaust ports, as a result of the flow of the exhaust gases.

Fig 2: Identifying Vacuum Connection Of Air Pump Switchover Valve And Right Shutoff Valve

Courtesy of MERCEDES-BENZ USA

Function

Both aspirator shutoff valves are opened simultaneously via the air pump switchover valve by means of the vacuum at connection (1). During ventilation at connection (1), they are closed by spring force.

The injected air from the air pump flows to the outlet ducts on each cylinder head when the valve plate is raised.

When air injection is off, the check valve prevents the admission of exhaust gas in the air shutoff valves and thus protects these from dirt and thermal destruction.