The plunger and the plunger sleeve are collectively called the plunger assembly, which is the most important precision assembly of the fuel injection pump. The plunger and plunger sleeve must not only pressurize the fuel, but also precisely control the fuel supply and injection time. Therefore, there must be a strict fit clearance (approximately 0.002 to 0.003 mm) to ensure fuel pressurization and certain Lubrication gap. In fact, it is difficult to guarantee interchangeability under such high accuracy, so it is necessary to select and match the parts in pairs, which cannot be interchanged. In addition, due to the high relative movement speed between the plunger and the plunger sleeve, the working surface is required to be very smooth, which must be achieved by grinding. The normal service life of the plunger and coupler is 2000 h.
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