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TM 10-4320-311-14
c.
Position the fuel injection nozzle so the discharge orifice is visible
d.
Set decompression lever to downward position.
e.
Rotate flywheel clockwise and confirm that fuel injection pump is producing adequate pressure to crack the
injection nozzle.
With the fuel tank, fuel line, and overflow hose Installed, the injection pressure must be tested for proper pressure.
(Refer to para 4-25.)
f.
Set speed control lever handle to run position.
g.
Set decompression lever to downward position.
h.
Rotate flywheel clockwise until the decompression lever releases to upward position
i.
Continue to slowly rotate the flywheel until the T position mark (1) aligns with the alignment mark (2) on the
cylinder block.
j.
Set the decompression lever to start (downward) position.
k.
Turn the flywheel first clockwise, then counterclockwise about 30 degrees from the T mark to make sure fuel is
discharged from the fuel injection pump outlet. Repeat steps f through i if necessary to inject fuel
I.
Turn the flywheel clockwise slowly until fuel just begins to flow from the pump outlet. Note the timing position on
the flywheel when fuel starts to flow.
m.
Repeat 3 or 4 times to make sure the reading is correct.
n.
The correct reading should be at 14 degrees, plus or minus 1 degree.
o.
If the injection timing is incorrect, refer to ADJUSTMENT procedure to correct.
ADJUSTMENT:
a. Fuel injection Timing Adjustment.
NOTE
Perform the following steps to adjust fuel injection timing after the timing has been checked
several times and incorrect timing is indicated.
(1)
The fuel injection timing is adjusted by adding or removing shims (7) (refer to Figure 5-5) to speed up or
slow down the actual fuel injection.
NOTE
Each 0.0039 Inch (0.01 mm) added slows timing by one degree. Each 0.0039 inch (0.01 mm)
removed speeds up timing by one degree. Shims are available In 0.0078 inch (0.2 mm) or 0.0117
inch (0.3 mm) sizes. Changes in 0.0039 inch (1 mm) units can be affected by using combinations
of 0.0078 inch (2 mm) and 0.0117 Inch (0.3 mm) shims.
(2)
Remove fuel injection pump.
5-18
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