Genuine BOSCH Distributor Cap
Part number GB739

A distributor cap is an important component in the ignition system of a car. It is typically made of plastic or rubber and is located on top of the distributor. Its main function is to distribute the high voltage from the ignition coil to each spark plug in the correct firing order. As the engine rotates, the camshaft inside the distributor rotates as well, causing the rotor to move. The rotor is connected to the distributor cap which has a series of contacts that correspond to each spark plug wire. When the rotor passes over one of the contacts, it sends the high voltage from the ignition coil to the corresponding spark plug. This process happens continuously and is what allows the engine to start and run smoothly.

Over time, distributor caps can become worn or damaged and may need to be replaced. Signs that a distributor cap may be failing include the engine misfiring or not starting at all. It is important to have a functioning distributor cap as a faulty one can lead to poor engine performance and even damage to other components in the ignition system. Regular maintenance of the ignition system, including checking and replacing the distributor cap when necessary, can help ensure a reliable and efficient engine.