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M/E Reversing

method 1: duplicate set of cams  for aster operation and camshaft is slided axially
method 2: circumferential transalation of camshaft using a servomotor. The relative movement changes the
fuel pump timing which inturn changes the firing order and astern starting.
method 3: shifting the position of angularly displacable fuel pump rollers  with an air cylinder & a second set of negative cam for the air distributor.(action in exhaust v/v actuator? ans: no action)
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