Component description for the air pump switchover valve - GF14.30-P-2020BK

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ENGINE 113.967 in MODEL 219

ENGINE 113.964 in MODEL 164.1

ENGINE 113.971 in MODEL 251

Fig 1: Identifying Pressure Sensor, Electric Air Pump And Air Pump Switchover Valve

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location

The air pump switchover valve is located at the front at the right cylinder head cover.

Fig 2: Identifying Air Pump Switchover Valve

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task

The air pump switchover valve is supplied with vacuum from the intake manifold through a check valve. The air pump switchover valve, when actuated, switches the intake manifold pressure through to the air shutoff valve. These open and the air supplied by the air pump is forced through drillings to the outlet ducts.

Design

Fig 3: Identifying Air Pump Switchover Valve Design

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

Fig 4: Identifying Air Pump Switchover Valve Function

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The changeover valve on the air pump is actuated directly with a ground signal by the ME control unit when air injection is enabled. As a result, the armature plate is attracted by the electromagnet and the rubber seal shuts off the air admission.

The connection between port 2 and port 3 is opened. Thus there is a vacuum built up from the intake pipe to the aspirator shutoff valve. In the de-energized state the link again exists between connection 1 and 3 through which connection 3 is supplied with air again.