OC60-E2, OC95-E2, WSM
ENGINE
M-7
5. FUEL SYSTEM
[1] GENERAL
Fuel from the fuel tank passes through the fuel filter,
and then enters the injection pump after impurities such
as dirt, water, etc. are removed.
The fuel pressurized by the injection pump to the
opening pressure (13.9 to 14.7 MPa, 142 to 150
, 2019 to 2133 psi), of the injection nozzle is
injected into the combustion chamber.
Part of the fuel fed to the injection nozzle lubricates
the moving parts of the plunger inside the nozzle, the
returns to the fuel tank through the fuel over flow pipe
from the upper part of the nozzle holder.
[2] INJECTION PUMP
NC Type mini pump is used for the injection pump. It
is small, lightweight and easy to handle.
The plunger (5) with a right-hand lead reciprocates
via the tappet roller (6) by means of the camshaft fuel
cam, causing the fuel to be delivered into the injection
nozzle.
(1) Pump Element
The pump element (1) is consists of the plunger (4)
and cylinder (2).
The sliding surfaces are super-precision machined to
maintain injection pressure at engine low speeds. Since
the driving face (5) fits in the control sleeve, the plunger
(4) is rotated by the movement of the control rack to
increase or decrease of fuel delivery.
As described above, the plunger is machined to have
the slot (3) and the control groove (6). The control
groove has a right-hand lead.
The plunger is provided with a low speed retarder to
maintain the combustion sound low under no load.
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(1)
Delivery Valve Holder
(4)
Delivery Valve
(2)
Control Rack
(5)
Plunger
(3)
Control Sleeve
(6)
Tappet Roller
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(1)
Pump Element
(4)
Plunger
(2)
Cylinder
(5)
Driving Face
(3)
Slot
(6)
Control Groove
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