FUEL INJECTION PUMP OPERATION [WL-3]
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Injection Amount Adjustment
• The fuel is increased or decreased by moving the control sleeve and changing the injection end timing. When the control sleeve moves to the left, the effective stroke, which determines the injection amount, is reduced and the injection amount is also reduced. On the other hand, when the control sleeve moves to the right, the effective stroke increases and the injection amount also increases.
• In the electronic control type fuel injection pump, the control sleeve position is moved by the electronic governor.
Injection Timing Adjustment
• The fuel injection timing is determined by moving the timer piston to change the relative position of the roller holder that contacts the cam plate.
• In the electronic control type fuel injection pump, the fuel pressure that actuates the timer piston is controlled by the timer control valve (TCV).
