Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Distributor Advance Unit: Description and Operation
Centrifugal Spark Advance Mechanism
Distributor - Exploded View
The centrifugal advance mechanism varies the relationship of the armature to the stator assembly. The armature is mounted to the sleeve and plate
assembly which rotates in relation to the distributor shaft. The rotation is a result of the centrifugal weights moving in response to engine RPM. The
movement of the weights change the initial relationship of the armature to the stator assembly by rotating the sleeve and plate assembly ahead of its static
position on the distributor shaft Fig. 2. This produces spark advance. The rate of movement of the weights is controlled by calibrated springs.
