Shibaura ST318, Workshop Manual

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18) Fuel filter
Fuel passage
Fuel passage
The fuel flows as shown in the figure from the tank,
pressurized by the injection pump to high pressure, and fed
to the nozzle and injected to the combustion chamber.
The fuel after lubricating the nozzle needle is returned to
the tank through the overflow pipe.
1. Tank 3. Injection pump
2. Fuel filter 4. Nozzle and holder
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Inspection
If water, dust, or other foreign matter is observed in the transparent plastic case, clean and replace the filter if necessary.
Disassembly and reassembly
(1) Remove the filter turning the filter ring nut counterclockwise.
NOTE: Take care to the O-ring fitted between the ring nut and main body, coat with grease before tightening.
(2) Coat the area of the element to be mounted to the main body with grease and install the element by hand.
19) Governor
Structure and functions
(1) Governor
This governor is a mechanical all-speed governor. It is
installed in the gear case. The fly weight ass’y is
installed to the cam shaft and its movement is
transmitted to the control rack of the injection pump
through the slider control lever link. The spring which
controls the movement of the fly weight is hitched to
the arm COMPL and tension lever. The spring tension
is changed by changing the governor lever so as to
control the engine speed.
(2) Maximum speed set bolt
A bolt is mounted on the cylinder block. This bolt
limits the movement of the arm COMPL (unloaded
maximum rpm). This bolt has been adjusted and sealed
at the factory.
(3) Smoke set, start spring
These are built into the cylinder block, to regulate fuel
injection amount at high speed range. Regulation of
fuel injection amount at middle speed range is made
with torque control spring to realize bigger torque.
A start spring is placed between the gear case and link.
This spring automatically functions to increase
injection amount of fuel at the time of engine start. The
smoke set had been adjusted at the factory.
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