Do spark plugs fire when points are open or closed?
Figure 1: Ignition points must lineup correctly when they are closed. If they don’t shut (left), or aren’t aligned (center), the system won’t work.
Why does my point distributor have no spark?
On a dual point distributor, one set will open with no spark and the other will spark when it opens. If the spark is a big fat one, then the condenser is bad and needs to be replaced. 2.
How does a distributor work in an engine?
The distributor has a shaft that gets spun by the camshaft. That moves other distributor parts that cause the ignition coil to pulse, and sends the electricity down each spark plug wire in order. The power travels down the spark plug wires to the spark plugs and causes sparks. The sparks ignite the fuel and air in the engine cylinders.
How to know if a point distributor needs to be replaced?
Remove the cap, turn the motor over and look at the points to see if they are opening and closing. If they are, see if they are sparking. On a dual point distributor, one set will open with no spark and the other will spark when it opens. If the spark is a big fat one, then the condenser is bad and needs to be replaced. 2.
What causes sparks in a distributor ignition system?
That moves other distributor parts that cause the ignition coil to pulse, and sends the electricity down each spark plug wire in order. The power travels down the spark plug wires to the spark plugs and causes sparks. The sparks ignite the fuel and air in the engine cylinders. That’s it. Hopefully you found that briefer and easier to understand.
How does the distributor in an ignition system work?
The distributor is basically a very precise spinner. As it spins, it distributes the sparks to the individual spark plugs at exactly the right time. It distributes the sparks by taking the powerful spark that came in via the coil wire and sending it through a spinning electrical contact known as the rotor.
How is the spark plug connected to the distributor?
This is done through the spark plug wires. Each contact point on the distributor cap is connected to a plug wire that takes the spark to the spark plug. The spark plugs are screwed into the cylinder head, which means that the end of the plug is sitting at the top of the cylinder where the action happens.
Where is the rotor located on a distributor?
The rotor is present at the top of the distributor shaft. It is driven by the camshaft of engine and hence synchronized to it. The rotor is pressed against a carbon bush on the central terminal of the distributor cap. The central terminal of the distributor is connected to the ignition coil.
What happens when distributor drive shaft moves away?
As the distributor drive shaft continues to rotate, and the corner lobe of the cam moves away, the contact breaker points will spring shut, completing the primary circuit and beginning the process of charging the primary coil once again. As the rotor arm is connected to the same drive shaft as the cam, the two rotate at the same rate.