R 3500 P/U 2WD V8-350 5.7L (1989)
Distributor: Description and Operation
Throttle Body Injection (TBI)
Typical Distributor Components
The distributor has a separate coil which connects to the rotor through a high tension wire.
The distributor uses a magnetic pick-up assembly located inside the distributor consists of a permanent magnet, a pole piece with internal teeth, and a
pick-up coil. When the teeth of the timer core, rotating inside the pole piece, line up with the teeth of the pole piece, an induced voltage in the pick-up
coil signals the electronic module to trigger the coil primary circuit. The primary current decreases and a high voltage of 35,000 volts is induced in the
ignition coil secondary winding which is directed through the rotor and secondary leads to fire the spark plugs. The capacitor in the distributor is for
radio noise suppression.
This distributor also features a longer spark duration, made possible by the higher amount of energy that is stored in the coil. This is desirable for firing
leaner mixtures.
No periodic lubrication is required. Engine oil lubricates the lower bushings and an oil-filled reservoir provides lubrication for the upper bushing.
