TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 31 of 764
TM9-2320-361-34
Table 2-1. Mechanical Troubleshooting (Contd).
I
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step
6.
Check fuel injection pump delivery operation. Loosen one injector line nut in hydraulic
head. Operate in-tank fuel pump and crank engine. Observe location of loose injector line
nut in hydraulic head.
If some traces of fuel, or no fuel pressure, is evident, replace fuel injection pump (para. 5-4)
and repair fuel injection pump (TM 9-2910-226-34).
END OF TESTING!
19. LOW FUEL SUPPLY AT INJECTOR NOZZLES
Step 1. Check fuel injection pump timing to engine (para. 5-4).
If fuel injection pump timing to engine is incorrect, adjust to specifications (para. 5-4).
Step 2. Perform troubleshooting malfunction 18.
Step 3. Check fuel injection pump internal timing.
WARNING
Ensure fuel shutoff valve is OFF and remove throttle cable before
cranking engine. Failure to do so may result in injury to personnel.
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
Ensure fuel shutoff valve is OFF.
Remove radiator (TM9-2320-361-20).
Slowly rotate crankshaft in clockwise direction (TM 9-2815-210-34-1). Stop cranksh~
rotation when correct timing mark on crankshaft damper is 2 in. (50.8 mm) before
engine timing pointer.
Place fuel shutoff cable in RUN position and governor lever in FUEL LOAD position.
Remove plug from hydraulic head delivery valve.
Remove valve spring and install plug in delivery valve.
Remove no. 1 injector fuel delivery line from no. 1 injector.
Remove timing cover located on fuel injector advance unit
(para. 5-4).
Operate in-tank fuel pump.
Slowly turn engine crankshaft in clockwise direction. Fuel flow should be evident from
no. 1 injector fuel delivery line until damper timing mark alines with engine timing
pointer.
If no fuel flows or fuel continues to flow from no. 1 injector line when advance unit hub
timing mark is l/16 in. (1.6 mm) from advance unit timing pointer (TM 9-2910-226-34),
replace (para. 5-4) and repair defective fuel injection pump (TM 9-2910-226-34).
END OF TESTING!
20. FUEL INJECTORS INOPERATIVE
Step 1. Check fuel injector nozzles operation (malfunction 18, step 2).
Step 2. Perform troubleshooting malfunction 18.
END OF TESTING!
21.
FUEL INJECTORS DELIVER EXCESS FUEL INTO ENGINE
Step 1. Check fuel injection pump fuel return line.
If fuel return line is bent, kinked, or restricted, replace fuel return line (TM 9-2320-361-20).
2-16
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