TM 5-2420-230-24-2
roubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Page TS-42
Section TS - Troubleshooting Symptoms
Engine Power Output Low
This is symptom tree T057.
Cause
Correction
Check for added loading from malfunctioning
Engine under excessive load
.......
accessories or driven units, brakes dragging,
and other changes in vehicle loading.
OK
F
uel shutoff lever (mechanical) partially
Check for correct solenoid operation. Refer to
.......
engaged
Procedure 005-043.
OK
E
Make sure the throttle linkage is not
misadjusted or damaged. Adjust and repair as
necessary. Check the fuel lever for stop-to-stop
ngine will not reach full throttle
.......
travel. Refer to the OEM service manual or the
Operation and Maintenance Manual, B Series
Engines, Bulletin No. 3810205.
OK
P
Verify by operating the engine from a tempo-
rary supply of No. 2 diesel fuel. Check fuel
specifications for proper fuel grade. Refer to
oor fuel quality or wrong fuel grade
.......
the Operation and Maintenance Manual, B
Series Engines, Bulletin No. 3810205 for fuel
recommendations and specifications.
OK
F
Fill the fuel tanks. Verify the fuel heater is off
uel temperature is above specification
.......
during warm weather. Refer to the OEM
service manual.
OK
F
Check the fuel lines, fuel connections, fuel
delivery valve seals, and fuel filters for leaks.
uel leak
.......
Check the fuel lines from the supply tank(s).
Refer to the OEM's service manual.
OK
A
Check for air in the fuel system. Repair source
ir in the fuel system
.......
of leak and bleed air from the system. Refer to
Procedure 006-003.
OK
T
(Continued)
L-626
