In all three embodiments, the drive mechanism prevents {HEAD ~ the fuel distribution shaft} from rotating during the discharge of a pressurized pulse of fuel which creates {TAIL ~ high side loading} and hence high frictional forces between the fuel distribution shaft and the surrounding housing bore 
In all three embodiments , the drive mechanism prevents { HEAD ~ the fuel distribution shaft } from rotating during the discharge of a pressurized pulse of fuel which creates { TAIL ~ high side loading } and hence high frictional forces between the fuel distribution shaft and the surrounding housing bore
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