In all cases, the intermittent rotation of the fuel distribution shaft prevents {HEAD ~ the shaft} from rotating at {TAIL ~ 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 the surrounding housing 
In all cases , the intermittent rotation of the fuel distribution shaft prevents { HEAD ~ the shaft } from rotating at { TAIL ~ 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 the surrounding housing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH