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Spark plugs are an essential component of the ignition system in internal combustion engines. They play a crucial role in igniting the air-fuel mixture inside the combustion chamber, ensuring smooth engine operation. One crucial aspect of spark plug maintenance is ensuring that the gaps between the electrodes are correctly set. The gap determines the size of the spark produced and directly affects engine performance. In this guide, we will explore the steps necessary to create proper gaps in spark plugs, providing you with the knowledge to maintain optimal engine performance and prolong the life of your spark plugs. Whether you are a seasoned mechanic or an enthusiastic car owner looking to improve your vehicle’s performance, this guide will serve as a valuable resource.
wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 12 people, some of whom are anonymous, have edited and improved the article over time.
This article has been viewed 20,042 times.
Spark plugs need to have the proper clearance for the engine to run smoothly. The size of the gap affects the ignition temperature of the spark plug, which is directly related to the combustion of fuel and gases in the engine. Enlarging this gap will create a wider spark, useful with certain types of custom engines to maximize performance. You can learn how to create clearances by measuring and adjusting accordingly. See step 1 for more details.
Steps
Measure clearance
![Image titled Gap a Spark Plug Step 1](https://www.wikihow.com/images_en/thumb/9/96/Gap-a-Spark-Plug-Step-1-Version-5.jpg/v4-728px-Gap-a-Spark-Plug-Step-1-Version-5.jpg)
- Each vehicle has a different clearance size, although most are between 0.07-0.15 cm. You can also look in the owner’s manual or go to auto parts stores and have them find it for you. [1] XResearch Source
- Modified motors will require a smaller clearance to withstand the current passing through the motor. Rule of thumb: the larger the current, the narrower the gap.
![Image titled Gap a Spark Plug Step 2](https://www.wikihow.com/images_en/thumb/f/f5/Gap-a-Spark-Plug-Step-2-Version-4.jpg/v4-728px-Gap-a-Spark-Plug-Step-2-Version-4.jpg)
- The coin-type gap gauge is usually the cheapest option, by running the edge of the “coin” through the gap until it stops. This point is marked as a gauge, which determines the thickness of the border at that point. This is a useful tool for older spark plugs when you want to check performance, but it can also accidentally widen the gap as you use it.
- The zinc wire coin gauge works the same way as a regular coin gap gauge, but it has different lengths of wire on the edge around the coin.
- The ruler is a very effective and versatile tool. Crafted like a hand knife, the ruler has multiple foil plates of varying thickness, some with wire at the end and others not, placed in the center of the gap to check the gap between the electrodes. pole. You can also use multiple leaves to measure larger openings. They are very effective when used for adjustment.
![Image titled Gap a Spark Plug Step 3](https://www.wikihow.com/images_en/thumb/6/63/Gap-a-Spark-Plug-Step-3-Version-4.jpg/v4-728px-Gap-a-Spark-Plug-Step-3-Version-4.jpg)
- You can use a little quick-drying alcohol (90%) on the contacts to clean if they are heavily soiled. However, too much soot or black flakes on the contact point can be a sign that the spark plug is past its service life.
![Image titled Gap a Spark Plug Step 4](https://www.wikihow.com/images_en/thumb/d/d9/Gap-a-Spark-Plug-Step-4-Version-4.jpg/v4-728px-Gap-a-Spark-Plug-Step-4-Version-4.jpg)
Adjustment of clearance
![Image titled Gap a Spark Plug Step 5](https://www.wikihow.com/images_en/thumb/7/78/Gap-a-Spark-Plug-Step-5-Version-4.jpg/v4-728px-Gap-a-Spark-Plug-Step-5-Version-4.jpg)
- Most spark plugs and iridium spark plugs manufactured today do not require clearance measurements prior to installation. Although if you own a pre-customized engine, you may still find it interesting to test or install spark plugs at different distances. Please adjust them accordingly.
![Image titled Gap a Spark Plug Step 6](https://www.wikihow.com/images_en/thumb/1/1e/Gap-a-Spark-Plug-Step-6-Version-4.jpg/v4-728px-Gap-a-Spark-Plug-Step-6-Version-4.jpg)
- Never bend more than 1 mm. It doesn’t take much pressure so be extremely careful. It’s very durable but not that durable.
- If you have trouble using the tool to adjust the gap, bend the tool with a flat surface like a table to apply a little pressure on the electrode to adjust it.
![Image titled Gap a Spark Plug Step 7](https://www.wikihow.com/images_en/thumb/1/17/Gap-a-Spark-Plug-Step-7-Version-4.jpg/v4-728px-Gap-a-Spark-Plug-Step-7-Version-4.jpg)
![Image titled Gap a Spark Plug Step 8](https://www.wikihow.com/images_en/thumb/f/f1/Gap-a-Spark-Plug-Step-8-Version-4.jpg/v4-728px-Gap-a-Spark-Plug-Step-8-Version-4.jpg)
Advice
- Try to keep the clearances between all spark plugs equal
- If the color of the terminals is different, the motor may have a problem
- Do not screw the spark plug too tight. The head is mostly made of aluminum and the thread can be easily twisted out.
- Spark plugs are relatively inexpensive, so it’s best to change them as often as possible.
Warning
- Be sure to reassemble the spark plug wires in the original order.
Things you need
- Leaf ruler
- 22m socket with drive
- Clip
- Rag
wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 12 people, some of whom are anonymous, have edited and improved the article over time.
This article has been viewed 20,042 times.
Spark plugs need to have the proper clearance for the engine to run smoothly. The size of the gap affects the ignition temperature of the spark plug, which is directly related to the combustion of fuel and gases in the engine. Enlarging this gap will create a wider spark, useful with certain types of custom engines to maximize performance. You can learn how to create clearances by measuring and adjusting accordingly. See step 1 for more details.
In conclusion, creating gaps in spark plugs is an important step in maintaining the performance of a vehicle’s ignition system. By ensuring the correct gap size, combustion efficiency and fuel economy can be improved. It is crucial to use the manufacturer’s recommended gap size and to check and adjust the gap regularly to avoid potential issues like misfires and decreased power output. Additionally, utilizing specialized tools like gap gauges and feeler gauges can facilitate the process. Taking the time to create and maintain properly spaced gaps in spark plugs will lead to a smoother and more efficient driving experience overall.
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