A labyrinth vent path is defined by the side walls of a mated cap and base of an ignition distributor. The vent path is biased open by a spring molded into the dielectric portion of the distributor rotor.

The spark ignition distributor cap assembly includes a distributor cap and a base with coupling means for removably securing the cap to the base during use of the ignition cap assembly. Sealing means is operatively associated with the cap and the base to provide a barrier therebetween so as to prevent liquid such as road water splash, or the like, from entering the interior of the cap and stalling the motor vehicle. Detecting means is operatively associated with the cap for indicating by visual means the moisture condition of the air within the cap. The detecting means comprises a chemical compound that changes its color when hydrated or percipitated, and housing means is mounted on the cap for receiving the detecting means therein.

A modular pushbutton keyset assembly includes a housing, a circuit board, a flat element and a pushbutton keyset held together by a clip. The circuit board includes a pair of contacts for each of the plurality of pushbutton keys. The flat element includes a plurality of resilient popples which have raised portions disposed to support corresponding ones of the plurality of pushbutton keys. The underside of each of the resilient popples is conductive, and when a pushbutton is depressed, the respective conductive underside contacts the corresponding electrical contact pair, thereby providing continuity therebetween.

A lightweight distributor rotor driveshaft formed as a unitary structure. The unitary structure includes a socket member for engaging the rotationally driven element in the engine, at one end, and a mounting bearing surface configuration at the opposite end. The rotational bearing surface formed at the opposite end of the rotor driveshaft provides self-lubricating bearing surfaces which slide over fixed metallic surfaces within the distributor housing.

A hollow tubular structure of a distributor rotor driveshaft having a relatively high coefficient of thermal expansion is mated with an axially aligned metal driving member having a relatively low coefficient of thermal expansion. The tubular structure contains an internal socket configuration which conforms with and surrounds the external surface of the metal driving member. Rotational driving forces are communicated from the metal member to the tubular structure throughout a wide range of temperatures due to a compression spring that surrounds a portion of the tubular socket to restrict its expansion.