Of course, you should only remove and install spark plugs in a cool engine, because metal expands when hot and thread damage can happen. The spark plug holes must always be clean prior to installation otherwise, you may be twisting against dirt or debris and the spark plug will be under-torqued, even though your torque wrench indicates the proper torque. 6 min read Do NGK Iridium plugs need to be gapped The answer to this question is yes. 14mm Spark Plugs (cont. In short, over torquing can cause severe engine damage. The most dangerous result is pre-ignition when the heat dissipation is reduced due to metal shell stretching by over torquing. Stretching of the spark plug metal shell can break the inner gas seals or cause a fracture in the spark plug insulator. If the feeler gauge or gap gauge can’t fit at the needed gap size, the plug gap needs to widen. Then, run the feeler gauge or gap gauge between the electrodes to determine the current measurement. Over torque can cause the metal shell of the plug to stretch. Check the owner’s manual for the recommended gap size. Proper torque specs for both aluminum and cast-iron cylinder heads are listed below. We also show you when you need to change your plug, we have a colour chart to show you how to interpret the condition of your plugs and a fitting guide, including the sockets you need and some. As a result, the firing end of the spark plug can overheat and pre-ignition can occur. In this spark plug guide, we cover everything from part number charts to showing you which spark plug you need for your particular model, whether that be a standard plug or a high-performance spark plug. A spark plug that is under-torqued will not be fully seated in the cylinder head and heat dissipation will be slowed. Torque directly affects the ability of the spark plug firing end to dissipate heat to the cylinder head. Torque is one of the most critical aspects of spark plug installation.
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