![]() The hole helps you accurately resize spark plugs with an electrode tool included. The gapper is also designed with a key ring hole or a spark gap opener with a 7/16 inch diameter. The sizes range from 0.02 to 0.1 inches with 0.01 increments, and they are easy to read. The gauge is calibrated in the imperial system, and the size markings are laser etched on the rugged steel construction. It can be used for measuring and readjusting the spark plug gap. It’s made up of a die-casted metal to harden the steel and increase the accuracy of the unit. The CTA Tools Spark Plug Gapper has a heavy-duty construction built for strength and durability. You may have to tighten the thumbscrew to keep the blades intact. Also, the blades may come apart if dropped. You may notice that the blades are oily upon delivery, and you need to keep on lubricating them to prevent rust. That’s easy to carry around in your pocket or in a toolbox.ĭespite being made of steel, these blades can rust when stored in humid conditions. ![]() The blades have smooth edges, and all 26 blades only weigh 3.2 ounces. The entire blade set maintains a neat and professional look due to the chrome-plated finish on each blade, which is easy to clean. The blades are held together with a thumb notch for easy removal of each piece. The blades are made of hardened tempered steel, which is long-lasting and resistant to rust and corrosion. The measurements are laser etched in the middle of each blade. You can get the exact value of the gap in either SAE or metric system (inches and millimeters). ![]() The OEM Tools Blade Master has 26 calibrated blades that can measure sizes ranging from 0.0015 to 0.025 inches. Types of Spark Plug Gap Tools Feeler Gauge If the gap is not properly aligned, the electrode will continue to discolor and will eventually burn away. ![]() Further inspection may reveal that the gap between the ground electrode and the center electrode is wider. Used spark plugs may have a slight discoloration at the electrode (negative probe). A new spark plug may not have the same gap size, and if you install it with a smaller or larger gap, you may notice a significant decline in your engine’s performance. These plugs have a designated ignition gap, heat range, and torque that works for your engine. Your original spark plug may come pre-gapped by the manufacturer. That way, you boost the efficiency of the spark plug in putting out a large enough spark to ignite the air and fuel mixture in your engine. The gapping tool will help you manually open the gap to the exact factory measurement recommended in your owner's manual. The size of the gap of a spark plug determines its firing performance. Achieve better spark plug performance.Valve cover gaskets will need to be replaced in addition to the spark plugs, wires or coils. Leaking valve cover gaskets, which have let oil get in contact with the spark plugs, coils or wires, may be the cause of ignition system issues.This may increase the parts and labor cost for the repair. Some engines require that the intake manifold be removed while replacing spark plugs.It is possible that when doing a spark plug replacement, your vehicle may also need additional parts like ignition coils, this will add to the repair cost.This may increase the cost of your repair. If your vehicle is equipped with spark plug wires (as opposed to a coil-on-plug system), the wires should be replaced at the same time.Plugs should always be promptly replaced per the manufacturer maintenance schedule even if they appear to be working perfectly.Consider earlier than required inspection and tune-up if you operate the car in severe conditions. High-speed driving may accelerate spark plug wear.When having spark plugs replaced keep in mind:
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