Fuel Injection Pump Outline - Yanmar 4LHA-HTP Operation Manual

Chapter 3 Fuel Injection Equipment

3. Fuel Injection Pump Outline

3. Fuel Injection Pump Outline
Control lever
Flyweight
Drive shaft
Feed pump
Roller holder
Cam disk
ig. 1 VE type injection pump construction
:
With the PE type (in-line type) injection pump,
the number of pump
assemblies) must be the same as the number
of engine cylinders. However, with the VE type
(distributor type) injection pump, the number of
plungers has no relationship to the number of
engine cylinders, and there is only one plunger.
This single plunger reciprocates while rotating,
and fuel oil is injected into each cylinder
through the injection pipes in accordance with
the engine's firing order.
As well as this, the governor, timer, feed pump
etc. installed on the outside of the PE type in-
jection pump are equipped within the VE type
injection pump.
Timer
Plunger spring
elements (plunger
3-1-4
Full-load adjusting screw
Delivery valve
In comparison with the PE type, the VE type
injection pump has less than half the number
of component parts, and was developed in
order to satisfy the need for a small, light-
weight and high-speed injection pump.
In response to operator requirements, it was
possible to design a pump with acceleration
close to that of gasoline vehicles.
i 4LHA Series
Governor lever
Magnet valve
Distributor head
Plunger