These are the easiest to use in DIYs since they don’t damage the spark plug electrode. The outermost edge is the thinnest, and it keeps increasing in width for bigger gap measurements, as you move towards the middle of the tool. Coin Gap Gauge - A coin gauge or a ramp-style gap tool appears similar to a silver dollar coin with markings along the edges.It typically looks like a pocket knife and is a very handy and inexpensive gapper. Feeler Gap Gauge - A feeler gauge is a gap tool that consists of well-calibrated metal strips of varying thickness parameters.When gapping spark plugs, your mechanic will use industry-approved tools (a gapper) that do not damage the spark plugs (mainly the center electrode). While you can gap spark plugs with household items in some situations, most technicians and car mechanics strongly recommend using a spark plug gapping tool. What Is The Best Tool For Gapping Spark Plugs? But you should always check the gap specification against a new spark plug set. Note: A new plug is mostly likely pre-gapped within the correct gap specifications. So, regular inspection and gapping are important for maintaining an old spark plug. This could lead to a rough idling engine, reduced fuel economy, or worse, engine failure. If you have a bigger gap, the sparks won’t consistently ‘jump’ across the distance between the ground electrode and center electrode. If you have a narrow gap, your spark plugs will generate an inefficient or weak spark and lead to lower fuel efficiency and engine performance. The spark plug gap plays a major role in the functioning of the spark plugs. Spark plugs are fine-tuned pieces of equipment and are very delicate to handle. Here are some frequently asked questions about the spark plug gap and their answers. Keeping this in mind, what are some other things you should know about spark plugs? 3 Spark Plug Gap FAQs Be careful with the spark plug wire and ignition coil. Note: When installing a new plug, make sure you use a torque wrench to tighten the new spark plug into the cylinder head. Iridium spark plugs can be very delicate and can bend very easily with too much pressure, thus damaging the plugs. This method is not recommended for expensive platinum or iridium spark plugs. If not, it’s probably best to use a spark plug gapping tool or consult a mechanic. Your spark plug gap should be within the correct gap parameters.Be careful not to touch the center electrode tip. If you have a very narrow gap, you can carefully use the coin to push the ground electrode outwards.For a bigger gap, you can use the back end of a screwdriver to bend the ground electrode ( ground strap ) inwards gently.Check to see if the gap measurement aligns with the spark plug gap setting. Start by gently sliding the coin between the spark plug gap. If the coin fits within the recommended specification, you can use it as a gapper.If your recommended gap size is different from these two, you’ll likely need to get a spark plug gap gauge or gapping tool. For reference, a penny measures 0.06” while a dime is 0.053”. Next, compare the recommended gap to your coin’s size.These are typically defined in the manufacturer’s manual. Identify the recommended gap for your car’s spark plugs.Be careful not to damage the spark plug wire or the ignition coil. Remove the spark plug from the ignition system.You can use a socket wrench, but a torque wrench is also helpful when installing new plug sets. Start by using a torque wrench to loosen the old spark plug.With that out of the way, here is how you can gap spark plugs without a tool: If you’re not confident in your mechanical skills, it’s best to let your mechanic handle the repairs. It can break very easily and cause serious engine damage. Note: Before you roll up your sleeves and get started with the gap adjustment, remember to be gentle with the spark plug electrode tip. ![]() But in case you don’t have any spark plug gap tool on hand, here’s how you can achieve the correct gap. Ideally, you should use the right tool for gapping your spark plugs. ![]() Maintaining the spark plug gap is an important part of keeping your old spark plug healthy and running smoothly. Let’s get started! How To Gap Spark Plugs Without Tool (Step-By-Step)
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