TP-6137 5/03 23Section 5 Fuel System
5.5 Excess Fuel Start Device
The engine is equipped with a device that supplies extra
fuel to facilitate engine starting. See Figure 5-8. When
the device’s button is pulled down, its upper conical
surface releases the fuel control lever and the fuel
injection pump pin performs a longer movement thus
increasing the fuel rate at the injector.
Figure 5-8 Excess Fuel Start Device Button
If the excess fuel start device is activated, the engine,
without load, reaches the higher speed. The governor
pushes the injection pump’s control lever towards the
lower value of supplying fuel and the excess fuel start
device button returns to its initial position.
Before pulling down the device’s button, start the engine
without load to allow it to reach it’s highest engine speed.
Note: To avoid heavy engine damage and engine
overload, never operate with the device’s button
pulled down.
The engine’s output power is dependant upon the
position of the upper conical surface of the excess fuel
button in the gear cover. The shorter its insertion in the
gear cover, the more fuel arrives at the injector. The
longer its insertion in the gear cover, the less fuel arrives
at the injector.
Note: The unit’s output power with the correct
adjustment of the excess fuel device is factory
set. Do not alter its setting. However, if the
excess fuel device and or gear cover are
removed or replaced, the high rate of supplied
fuel at the injector must be readjusted on the test
bench.
1. Conical surface of the excess fuel starting device
2. Yoke of the inner control lever
3. Pin of the fuel injection pump
1 23
Figure 5-9 Excess Fuel Start Device Button
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