Does a dragging starter stop a 7.3 diesel from starting?
A "dragging-starter" can fail to "spin" or rotate a diesel engine at an RPM sufficient to aid in the combustion process that is needed in a diesel engine.
Although all glow plugs might be working effectively, if the starter fails to turn the engine over at sufficient RPM, the diesel fuel entering the combustion chamber can fail to ignite. Diesel engines have higher compression-ratios than gasoline engines and diesel fuel explodes in the compression chamber (if the glow plugs are functioning AND the engine is turning over fast enough when the starter is engaged.
Starter motors on diesel engines are generally more robust than starters on gasoline vehicles. The additional higher-torque value on starters used in diesel applications provide the added boost needed to start the engine.
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