In a plastic hydraulic tensioner having an oil reservoir formed as a recess in a portion of a synthetic resin tensioner body adapted to engage a tensioner mounting surface on an engine block, metal bushings are insert-molded in the synthetic resin tensioner body for receiving mounting bolts by which the tensioner is secured to an engine block. The water vapor is generated by introducing O2 and an H2 containing forming gas including hydrogen and at least one dilutant gas into the CMG. The control mechanism is configured to determine whether terminate a current wash cycle based on a signal output by the sensor. The update data in audio format is transmitted to the mobile telephone via the voice connection.