In {HEAD ~ all cases}, the intermittent rotation of the fuel distribution shaft prevents the shaft from rotating at a time when the discharge of a highly pressurized fuel pulse applies a high side load to the shaft which in turn can generate high frictional forces between the fuel distribution shaft and {TAIL ~ the surrounding housing} 
In { HEAD ~ all cases } , the intermittent rotation of the fuel distribution shaft prevents the shaft from rotating at a time when the discharge of a highly pressurized fuel pulse applies a high side load to the shaft which in turn can generate high frictional forces between the fuel distribution shaft and { TAIL ~ the surrounding housing }
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