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A "glow plug" preheats the cylinder. Diesel engines do not have spark plugs (Diesel's goal was to make an internal combustion engine that could run on anything; he specifically had in mind a kind of slurry made from coal), instead using the heat of compression to ignite the fuel.

This usually works fine when the engine is actually running, but it can be difficult to cold start a Diesel engine since the cylinder and block absorb some/most of the compression heat (it's not a problem once the engine's been running, because by then they're already hot). The glow plug exists to preheat the ignition chamber and/or the fuel, making it easier to start the engine from a cold state.

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