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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
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Find out the clearance specifications for your vehicle. Whether you’re looking to buy a new spark plug, you just bought a new spark plug and want to test it before installing, or you want to test the functionality of your existing spark plug kit, you need to find out about the proper clearance between the two terminals electrodes. spark plug.
- 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] X Research 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.
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Select a suitable gap gauge. There are many types of tools used to measure spark plug clearance, others are suitable for use with modern spark plugs containing fragile precious metals. Most gauges will feature a flat rim commonly used to bend the end electrode on the spark plug and adjust the clearance gently.
- 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.
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Clean spark plugs. If you’ve taken it out of the box it should be in perfect condition, but if you’re checking the spark plugs you’re using in your car it’s better to clean it with a clean cloth. Spark plugs will likely create a slightly white layer of soot on the contacts, so you’ll need to make sure they’re clean for accurate results. [2] X Research Source
- 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.
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Measure the clearance by passing the tool through the electrode. Place a foil or wire on the measuring tool between the electrode tip of the spark plug or pass a coin over the electrode to determine the measurement.
Adjustment of clearance
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Determine if clearance needs to be adjusted. If the tool passes through the gap without touching the electrode after using the proper measurement method, your gap is too wide. If you can’t fit the electrode, the gap is too narrow and needs to be widened a bit. If it fits snugly with the specific gauge, you should now be able to safely insert the spark plug. [3] X Research Sources
- 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.
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Use the tool to adjust the lower electrode. When you hold the spark plug with the electrode down to the floor, you should bend the bottom pole gently toward the other electrode if you want to narrow the gap or outward if you want to increase the gap a bit.
- 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.
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Measure the distance again and adjust it properly. Be careful not to touch the electrode in the middle of the spark plug and damage the core. If the electrode is broken or short you will have to throw it away and buy a new one.
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Always be gentle. Breaking an electrode takes time and it’s not difficult to break an electrode. Using only a small amount of force to bend the electrode and just a little bending is enough.
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
X
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.
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