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TM 10-4320-348-14
(5)
Rotate flywheel clockwise and confirm that fuel injection pump is producing adequate pressure to crack the
injection nozzle. With the fuel tank, fuel hose, and overflow hose installed, the injection pressure must be
tested for proper pressure. (Refer to para 4.26).
(6)
Set speed control lever handle to run position.
(7)
Set decompression lever to downward position.
(8)
Rotate flywheel clockwise until the decompression lever releases to upward position.
(9)
Continue to slowly rotate the flywheel until the T position mark (1) aligns with the alignment mark (2) on the
cylinder block.
(10)
Set the decompression lever to start (downward) position.
(11)
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.
(12)
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.
(13)
Repeat 3 or 4 times to make sure the reading is correct.
(14)
The correct reading should be at 14 degrees, plus or minus 1 degree.
(15)
If the injection timing is incorrect, refer to ADJUSTMENT procedure to correct.
e.
Adjustment.
(1)
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.
(Refer to Figure 5-7)
(a)
The fuel injection timing is adjusted by adding or removing shims (7) 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.
(b)
Remove fuel injection pump.
(c)
Add or remove shims (7) to achieve a timing of 14 degrees, plus or minus 1 degree before top dead
center.
(d)
Install fuel injection pump and repeat test.
5-19
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