FUEL INJECTOR PUMP CALIBRATION (Cont).
Adjustment in step 1 should be made during applicable step, Adjustments
in steps 2-5 should be made after all calibration is completed, unless
If any throttle advance gage (13)
reading is not correct, adjust position
of servo adjusting screw (22) to obtain
proper reading. After all testing is
complete, apply pipe sealant to servo
If any flowmeter reading is too low,
replace metering screw with a smaller
If any flowmeter reading is too high,
replace metering screw with a larger
If any housing pressure reading is not
correct, test fuel injector pump. (See
paragraph 3-44) If no leaks are
detected, remove hydraulic head and
components. (See paragraph 3-42)
If any transfer pump pressure reading
is not correct, remove transfer pump
blades and regulator and check for
incorrectly assembled components.
(See paragraph 3-41 )
1. Set test stand supply pump boost pressure at 4.5-5.5 psi (31-38 kpa).
Test specifications refer to engine rpm. Most test stand tachometers
register fuel injector pump rpm, which is half of engine rpm. Ensure that
proper adjustments are made during calibration.
Set rpm at 2000, with throttle lever (17) in wide open throttle position. Allow fuel injector pump to
run for 10 minutes to clear remaining air from system and bring fuel injector pump to operating
Set rpm at 2000, with throttle lever (17) in wide open throttle position. Set transfer pressure gage
(6) to indicate 58-64 psi (400-441 kPa). Flowmeter reading must be 225-375 cc, Perform
ADJUSTMENT if necessary.
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