TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms
Page TS-47
Engine Runs Rough at Idle (Continued)
Cause
Correction
Put the engine at top dead center. Check and
Fuel injection pump timing is not correct
.......
adjust the fuel timing. Refer to Procedure
005-013, 005-014, or 005-037.
OK
V
Check and adjust the valves. Refer to Proce-
alves are not sealing correctly
.......
dure 003-004.
OK
E
Perform the compression check to identify the
ngine compression is low
.......
malfunction. Correct as required. Refer to
Procedure 014-008.
OK
I
Perform a pot test on the injector(s). Refer to
njector is malfunctioning
.......
Procedure 006-026.
OK
F
Remove the fuel pump. Refer to Procedure
uel injection pump is malfunctioning
.......
005-012 or 005-014. Calibrate the fuel pump.
L-631
