How to Fix an Aircraft Spark Plug

There are several problems with an aircraft spark plug. It's a common mistake to assume that the plug can be replaced when the problem really isn't with the engine itself, but this isn't always the case. A simple replacement can fix the symptoms and secondary effects of the problem, but is not always the solution. Here are some things you should check before replacing your spark plug. Keep reading to learn how to fix your spark plug!

One of the main reasons for the early spark plugs' ill-fated design was the lack of resistors. This meant that the spark plugs would lose their reliability much sooner. It would cause hard starting, excessive mag drops, and arc-over damage to the magneto, and electrodes would erode excessively. Fortunately, it is possible to find a good balance between ignition performance and spark plug electrode resistance. Today's spark plugs, including the ones made by Champion and Tempest, measure between 1,200 and 2,500 ohms.

A spark plug's main purpose is to ignite aerosolized fuel in the cylinders by sending high-voltage spark across a gap. While this gap is critical, if it's too small, the spark plug will dissipate before the correct voltage has been applied. Similarly, if the gap is too far apart, the spark will burn through before the correct voltage is reached. If the gap is too large, the spark plug will have to fire through a resistance that can damage the engine.

As with any other part of an engine, an aircraft spark plug's design and materials should be chosen carefully. Spark plugs used in aviation engines must meet strict standards. If the spark plug is not installed properly, it could potentially cause engine misfires or lead deposits. A quality spark plug must be reliable and dependable. Fortunately, there are several brands of aircraft spark plugs that meet the strictest standards and specifications for safety and reliability.

When choosing a new spark plug, make sure to check for corrosion and fouling. The plugs are caramel-colored, and their edges should be a darker color than their tips. They should be free of cracks, excessive gaps between the center electrode and ground electrode, and other problems. Nevertheless, some plugs may have signs of lead, carbon, or oil fouling. If you suspect fouling, make sure to replace the plug immediately.

To avoid contamination, check your ignition wires and the spark plug threads for wear patterns. Spark plug threads are positioned in a way that minimizes polarity effects on wear patterns. If the spark plug is corroded, you should replace it immediately. If you're not sure what to do, consider purchasing a spark plug rack made by Forbes Aviation Products. The spark plug tray is a convenient portable unit that holds up to twelve spark plugs.

Among the many types of aviation spark plugs available, massive electrode and extended reach are the most common. Those with fine-wire spark plugs may have less maintenance. Some of these plugs may even improve fuel efficiency. Despite these differences, the main purpose of the aircraft spark plug is to take 25,000 volts from the magneto and produce a spark gap between the center electrodes of the plug. Once the spark is created, the fuel/air mixture is ignited.