Automotive Manual PDF

Installing spark plugs
Torque is one of the most critical aspects of spark plug installation. Torque directly affects the spark plugs’ ability to transfer heat out of the combustion chamber. A spark plug that is under-torqued will not be fully seated on the cylinder head, hence heat transfer will be slowed. This will tend to elevate combustion chamber temperatures to unsafe levels, and pre-ignition and detonation will usually follow. Serious engine damage is not far behind.
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Full-Torque® thread repair inserts are made of hard anodized aluminum for spark plug holes in aluminum cylinder heads and steel, for cast iron heads. FFT-Style Deep Reach inserts match the Ford Triton 4.6, 5.4 and 6.8 liter engines. Inserts for aluminum heads are made of hard anodized aluminum for optimum heat transfer.
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