TM 9-4110-255-14
5-40. INJECTION PUMP TESTING, REPLACEMENT, AND ADJUSTMENT .-Continued
(7) Monitor the pressure gage reading and slowly turn the engine flywheel (11) clocwise. The reading on the
k
gage will show a progressive pressure increase to the maximum value noted in step (6), then will begin to
drop suddenly. Stop turning the engine pulley at this point and monitor the gage reading as well as the
time it takes the pressure to stop dropping. Note the final pressure reading, to establish the pressure drop,
and the elapsed time.
(a) If the total pressure drop was greater than 50 psi (4906 kPa), replace the injection pump (12).
(b) If the drop occurred in less than 7 seconds, replace the injection pump (12).
(c) If the pressure dropped suddenly as expected but continued to fall slowly, replace the injection pump
(12).
CAUTION
Always use two wrenches when tightening the fuel pipe to prevent turning the nozzle or injection
pump fitting.
(8) If no failure was indicated, remove pressure gage and install fuel pipe (8). Tighten two flare nuts (7) to
between 11 and 18 ft-lb (15 and 25 Nm).
(9) Install new gasket (6), cover (5) and three screws (4).
(10) Install cylinder casing (3), flat washer (2), and screw (1).
(11) Release manual shut down lever (10).
b. Removal.
(1) Remove screw (1), flat washer (2), and cylinder casing (3).
(2) Remove three screws (4), cover (5) and gasket (6). Discard gasket.
CAUTION
Always use two wrenches when loosening the fuel pipe to prevent turning the nozzle or injection
pump fitting.
(3) Loosen two flare nuts (7) and remove fuel pipe (8).
(4) Remove fuel filter to injection pump hose assembly (13) (para 4-62).
(5) Loosen screw (14) and remove clamp (15).
(6) Remove two screws (16), cover (17), and gasket (18). Discard gasket.
(7) Remove clip (19).
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