Moisture drain bush for an engine starter motor

摘要

A moisture drain bush for use in a moisture drain hole in an engine starter motor housing wall comprises a stem having a first and a second end and an axial length equal to a housing wall thickness and having an axial groove extending between the first and second ends of the stem. A first flange may be frustoconical shape so that its conical circumferential surface guide and assists smooth insertion of the flange into the drain hole, and has a flat inner surface radially extending from the first end of the stem and larger than the drain hole is provided. The first flange also has a first radial groove connected to one end of the axial groove in the stem and radially extending to the outer periphery of the first flange. A second flange having a flat inner surface radially extends from the second end of the stem and larger than the drain hole is provided. The second flange has a second radial groove connected to the other end of the axial groove in the stem and radially extends to the outer periphery of the second flange. Thus, when the drain bush is inserted within the drain hole in the motor housing, the axial groove and the first and second radial grooves as well as the drain hole together defining a continuous but bent moisture drain path.