| 摘要 |
A fuel injection pump having a cam and pump plungers movable relative to the cam to translate the contour of the cam into a sequence of pumping strokes is disclosed. An advance piston connected to the cam to adjust the timing of the pumping strokes is controlled by a hydraulic pressure which increases with engine speed. The advance piston mounts two control pistons one of which controls the delivery of hydraulic pressure to the advance piston after a predetermined engine speed is reached and the other bypasses the first to control the delivery of the hydraulic pressure during starting and until a lower engine speed is reached.
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