Over-tightened plugs can damage the threads in the cylinder head and be a costly repair or require a new cylinder head. Ideally, do this when the engine is at room temperature. The insulator could have a hairline fracture that is not visiable and could break off in the combustion chamber potentially causing internal engine damage.įinally, when tightening the plug, use a torque wrench and tighten to the factory specification. If at any time during the procedure, a spark is dropped, DO NOT USE IT, dispose of it immediately. Unless directed to do so via the factory repair manual, refrain from using pastes or sealants on the threads of the spark plug as this can weaken the ground connection between the plug and cylinder head. The gap is correct when you feel a slide drag and the next size up feeler gauge will not fit in the gap, generally 0.001" or. Do not force the gauge between the ground strap and center pin. Using the side of the feeler gauge, carefully measure the gap. Avoid contacting the center pin or galling or scratching the ground strap as this could lead to pre-ignition of the air/fuel mixture due to hot spots and premature wear. Carefully bend the ground strap to open or close the air gap of your spark plug. Although the spark plugs are pre-gapped from the factory to a certain standardized specification, your application may require a smaller gap for optimal performance and to prevent misfires. NOTE: Refer to your installation manual for the proper spark plug gap to be used. This could potentially damage the plug if the center electrode and ground strap make contact. It is not recommended to tap the spark plug on a flat surface to lower the air gap. The video shows which tool for adjusting the ground strap and a feeler gauge to measure the air gap. Pay particular attention to material type, heat range, and thread length. Use the correct spark plug for your application. If you have spark plug problems, look for replacements from popular brands such as NGK, DENSO, Motorcraft, Autolite or ACDelco.STEP 1. When spark plugs begin to wear out, your engine can misfire, stall and have trouble starting. Spark plugs are installed in your engine, and generally changing them out is a simple task. What should I do if my spark plugs wear out? For reference, see our spark plug gap chart below, this chart converts metric measurements to standard. To set the spark plug gap correctly, you need to use a spark plug gap tool. Spark Plug Gap setting is important for proper engine operation. Use the part finder to see all the performance options available for your engine! Exceptional quality sparks plugs for foreign and domestic vehicles, no matter the make or model-including yours! Feed your passion for racing and high performance and get maximum output from your engine. Register today for access to special offers and exclusive content. What kind of spark plugs does Autolite use?īecause you take working outdoors seriously, Autolite Lawn and Garden spark plugs feature a nickel alloy center and side electrode, nickel-plated rolled threads and a steel shell. Anti-seize can alter the tightening torque up to 20%, increasing the risk of breakage. The nickel coating on most modern spark plugs provide added protection from seizing in aluminum cylinder heads and has made anti-seize less important in spark plug installations. Since anti-seize compounds contain metallic, electrically conductive ingredients, the ingredients can come in contact with the electrodes on the spark plugs, leading to misfires.Ĭan you use aluminum anti seize on spark plugs? Should I use anti seize on Autolite spark plugs?Īutolite does NOT recommend the use any type of anti seize lubricant when installing new Autolite spark plugs. Using a spark plug gap tool allows you to achieve the exact measurement recommended by the manufacturer. Why You Should Use a Spark Plug Gap Tool Whether you’re looking to maximize the performance of your vehicle or just want to double check that the setting is right, using a spark plug gap tool is vital. Gapping has always been the job of the installer. Because of the many gap sizes required, no one offers spark plugs properly gapped for every application. Autolite® and all spark plug manufacturers offer spark plugs pre-gapped in the most popular gap sizes.
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