Shibaura N843, Руководство по ремонту

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3-16 109823 2/09
Fuel filter
Note: N843 and N843L engines (used in the
Hustler 3500 and 3700) have an electric
fuel pump.
Fuel flow
The fuel flows as shown in Fig. 3-40, 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.
Note: S773L engine (used in the Hustler Diesel Z)
has a marine type squeeze ball located
between tank and Mechanical pump.
Squeeze ball us used for fuel priming
purposes
Inspection
If water, dust, or other foreign matter is observed in the
sediment bowl, clean and replace the filter if necessary.
Disassembly and reassembly
1. Remove the filter turning by the filter ring nut
counterclockwise.
Note: Be careful not to damage the O-ring 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.
Governor
Structure and functions
1. Governor:
This governor is a mechanical all-speed governor. It is
installed in the gear case. The flyweight assembly is
installed to the camshaft 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 flyweight is connected to the arm COMPL and
tension lever. The spring tension is changed by changing
the governor lever 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 the fuel
injection amount at high-speed range. Regulation of the
fuel injection amount at middle speed range is made with a
torque control spring to obtain higher torque.
A start spring is placed between the gear case and link.
This spring automatically functions to increase the amount
of fuel injected when the engine is started. The smoke set
has been adjusted at the factory.
Injection pump
Disassembly, Inspection and Reassembly
Disassembly, inspection, and reassembly of injection
pump:
Note: Service of fuel injection pump is to be done
Fig. 3-40
1. Fuel Tank
2. Mechanical fuel pump
3. Nozzle and holder 4. Fuel filter
5. Injection pump
4 1
5
2
3
Fig. 3-41
Link
Tension lever
Start Spring
Arm COMPL