Distributor Rotor

Distributor rotor is situated in the distributor that is a fundamental component of each engine. In the housing there is a distributor cap, from which ignition cables go to the spark plugs. The spark plug wire that leads from the coil to the distributor is also attached to it. Within this component, the distributor rotor rotates in a circle and thus reaching the individual contact areas of the individual cylinders provokes electrical contact. However, contact areas of the distributor rotor do not touch round guided ignition contacts. Within this module working voltages is up to 30,000 volts and the current overcomes air effortlessly. Still, because of this electrical power distributor rotor wear is possible.

Before replacing the distributor, it is necessary to disconnect the electrical power source of the vehicle and the vehicle battery from the electrical circuit. Then it will be easy to replace the distributor. Those people, who have some technical skills, substitute the distributor rotor by themselves to save on repair cost.

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HOW TO IDENTIFY A FAULTY IGNITION DISTRIBUTOR ROTOR

To diagnose the component, measure its working resistance. Connect the component to the electric circuit of the measuring bench, and connect an ohmmeter. For the contact ignition systems, normal resistance is 5-6 KOhm, and for contactless systems — 1 KOhm. The resistor should also be checked.

The rotor may be tested as follows: extract the center wire from the ignition distributor cap, then turn on the ignition, and hold the wire at a 3 mm distance from the contacts of the component. If a spark is observed at the moment of contact opening, the rotor is faulty.

After inspecting the component, make sure that no cracks are present, and check the contacts. Also check the clearance between the rotor and the carbon contact. If the clearance exceeds 1 mm, the carbon contact will burn out fast. The distance between the contacts of the component itself should not exceed 0.45 mm.