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7. FUEL INJECTION PUMP/GOVERNOR
Only the outline of the MP fuel pump is explained in this chapter. Refer to the MP pump service manual of
the separate volume for the disassembly and assembly.
7.1 Introduction
It is described about the features of the fuel injection
pump, YDP-MP disassembly, and assembly and
adjustment procedure.
Fuel injection pump is the most important equipment,
which is enable to make the sensitive adjustment
according to the variable load of the engine.
Therefore all of the parts are required not only very
precise machining but also finest, assembling with top
level.
The careful arrangement of keeping off the dust and the
rust when disassemble, adjustment and reassemble of the
fuel injection pump is made in the market.
The YDP-MP Pump is a distributor type pump which is unified of Mono-plunger, a distributing shaft, a
hydraulic head which equipped the delivery valve for each cylinder, pump housing which has a cam shaft
internally and governor.
The fuel, which is pressurized by the up and down movement of the plunger driven by the cam-rotation, is
supplied through the distributor shaft, which is rotating accordingly.
There are a model YDP-MP2 and a model YDP-MP4, and plunger diameter and fuel cam speed are
different.
7.2 Fuel Injection Pump
7.2.1 Fuel system diagram
