FAQ: What Is A Rotor Button?

The distributor uses the crankshaft to spin the shaft. This motion spins a rotor (rotor button) which is situated at the top of the shaft, inside the distributor cap. When the rotor spins past the contact points in the distributor cap it creates a spark. The spark travels up to the leads and on to the spark plugs.

How do you know if you have a bad rotor button?

Usually a faulty distributor rotor and cap will produce a few symptoms that alert the driver that service may be required.

  1. Engine misfires. Engine misfires can occur for a number of reasons.
  2. Car doesn’t start.
  3. Check Engine Light comes on.
  4. Excessive or unusual engine noises.

What does a distributor rotor button do?

As the distributor shaft turns;, the “Rotor Button” (which is connected to the top of the shaft) spins and directs the incoming spark (which it receives through a spring-loaded pin on the inside of the cap) to the correct cylinder.

What causes rotor button to break?

Re: Distributor rotor keeps breaking (mgyip) It is possible that the front motor mount is bad. Motor leans back as you accelerate and the distributor cap rubs against something (ie: the master cylinder) and pushes it into the rotor button as it is turning and snap, a broken rotor button.

How do you diagnose a bad distributor?

How to Tell If You Have a Faulty Distributor

  1. Check the Distributer Cap. Often the distributor cap is suspect.
  2. Check the Contact Points. Inspect the condenser; the engine will not function if it is broken.
  3. Check the Arc.
  4. Tools and Materials.
  5. Crank the Engine.
  6. Remove the Old Distributor.
  7. Set the Point Gap.
  8. Set the Distributor.
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How do you test an arm rotor?

Get someone to crank the car over while with insulated pliers you hold the coil lead about 3mm away from the copper segment of the rotor arm. if you have points rotate the engine over until the points are closed and then flick the points open with a screwdriver.

How do you test a distributor rotor button?

Hold the coil HT lead near the tip of the rotor, and flick the points open. You will get spark as the points open. If the spark jumps from the HT lead to the rotor, then the rotor is bad and is grounding the spark to the rotor drive shaft.

What is a distributor button?

Distributor caps and rotors are responsible for passing the voltage from the ignition coils to the engine’s cylinders in order to ignite the fuel-air mixture inside and power the engine. The coil connects directly to the rotor, and the rotor spins inside the distributor cap.

How does distributor rotor work?

Distributor rotors work by providing a movable connection between an ignition coil and a set of spark plugs. A distributor rotor sits on top of a distributor shaft and spins inside a distributor cap. As the rotor turns, it periodically makes and breaks contact with the outer terminals inside the distributor cap.

What is a rotor button?

The distributor uses the crankshaft to spin the shaft. This motion spins a rotor (rotor button) which is situated at the top of the shaft, inside the distributor cap. When the rotor spins past the contact points in the distributor cap it creates a spark. The spark travels up to the leads and on to the spark plugs.

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How do you change a distributor to electronic?

A conversion to electronic ignition can be as simple as removing the old points and installing a new magnetic pickup in the distributor.

  1. Your Electronic Ignition Conversion/Upgrade Kit.
  2. Most Electronic Ignition System Conversions Begin with Changing the Distributor.
  3. Installing a Factory Replacement Ignition Control Module.