3304 & 3306 – Glow Plugs

Glow plugs are an aid for cold weather starting. During cold weather starting, the pressure in the cylinders made by the compression stroke is not enough to start combustion of the fuel injection charge. Activating the glow plugs for the correct length of time heats the precombustion chambers to the temperature which is necessary for combustion when the engine is turned for starting. After combustion starts and the starting motor is no longer necessary to keep the engine running, more operation of the glow plugs heats the precombustion chambers until the engine is running smoothly.

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