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TM 10-3930-638-24&P
4-3. FUEL SYSTEM MAINTENANCE (cont)
b. Fuel Injection Pump (cont).
e. Return oil
check
STEP
LOCATION
ITEM
ACTION
REMARKS
TESTING (cont)
40
Test stand
Pump
Operate pump
Dry pump off completely with compressed
at 1000 RPM
air. Check for leaks and correct if
wide open
necessary
throttle for
10 minutes
41
Housing
a. Low idle adjusting
Back out
screw (41)
b. High idle adjusting
Back out
screw (43)
c. Torque screw
Back out
(52)
d. Vacuum check
a. Close shutoff
valve in fuel
supply line
b. Operate pump Transfer pump must create a vacuum of at
at 400 RPM
least 18 inches of mercury. If not, check
for air leaks between pump inlet and shut-
off valve or deficiencies in transfer pump
components
a. Fill graduates
to bleed
air from
test stand
and to wet
graduates
b. Operate
Direct return oil flow into calibrated gradu-
pump at
ate. Return oil flow shall be 200±500CC/
2100±10
minute
RPM
CAUTION
Under no circumstances exceed 130 PSI when performing the
following.
f. Transfer pump
Operate pump
Transfer pump pressure shall be 67-71 PSI
pressure check
at 2100±10
RPM
NOTE
Transfer pump pressure gauge must be isolated by the shutoff
valve at injection pump when checking fuel delivery and advance
movement.
4-129
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