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Glow Plugs

Glow Plugs

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A glowplug alternative spelling glow plug or glow-plug. A glow plug is a heating device used to aid starting diesel engines. The glow plug is a pencil-shaped piece of metal with a heating element  at the tip. This heating element, when electrified, heats due to its electrical resistance and begins to emit light in the visible spectrum, hence the term "glow" plug. Heat generated by the glowplugs is directed into the cylinders, and serves to warm the engine block immediately surrounding the cylinders. This aids in reducing the amount of thermal diffusion which will occur when the engine attempts to start.


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Bosch is the world's leading supplier of diesel fuel injection systems and the leader in the development of cleaner, more efficient diesel engine systems, components and replacement parts.