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7 GLOW PLUG SECRETS
PHOTOS BY PETE HALL FINDING THE RIGHT ONE FOR YOUR ENGINE The size of the element cavity affects the plug's rating. The small cavity (black-oxide plug) helps reduce the temperature rating; the large cavity (nickel-plated) helps increase the temperature rating. With the cylinder head removed from the engine, the long-reach standard glow plug should be flush with the upper surface of the combustion chamber (as shown). When you ask most people about the glow plug,...
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