TP-6137 5/0324 Section 5 Fuel System
5.6 The Injection Pump’s Fuel
Starting Delivery Point
For proper engine operation, ensure the correct
adjustment of the fuel starting delivery point. As the fuel
pump timing is fixed, check or readjust it only when
altering engine speed, installing a new injection pump,
or replacing the camshaft or gear cover.
1. Move the engine towards the compression stroke.
2. Put a mark on the flywheel at the 5 o’clock position
with the piston that is before Top Dead Center
(TDC).
3. Remove the injection pump’s allen head screw and
sealing washer from the fuel pump body and install
in its place a drip tube with a sealing washer located
between the pump and the tube. See Figure 5-10.
Note: Fuel will flow from the pump immediately after
loosening the allen screw.
Figure 5-10 Drip Tube
4. To locate the injection pump’s fuel starting delivery
point, put the accelerator lever in the higher speed
position and keep the inner control lever in the
higher fuel rate position.
Note: In order for fuel to reach the injection pump,
perform this check with the fuel solenoid valve
and the electric fuel pump energized.
5. Engine stop condition. Move the engine in the
counterclockwise direction (as viewed from the
flywheel) and check the drip tube. Fuel will flow
freely and then cease.
6. Obtain the correct fuel starting delivery point when
the plunger has reached and closed the injection
pump’s allen head screw’s hole and only a drop of
fuel comes out from the tube every second. See
Figure 5-11.
Figure 5-11 Fuel Drop
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