TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 382 of 1313
FIELD MAINTENANCE
EXCESSIVE FUEL CONSUMPTION
INITIAL SETUP:
Tools and Special Tools
Tool Kit, General Mechanic's: Automotive
(Volume 5, WP
0826, Table 1, Item 56)
Personnel Required
(2)
References
Point to Point Schematics
References (cont.)
TM 9-2320-272-10
Volume 2, WP
0254
Equipment Condition
Vehicle parked and engine shut down.
(TM
9-2320-272-10)
TROUBLESHOOTING PROCEDURE
EXCESSIVE FUEL CONSUMPTION
NOTE
Conduct these malfunction tests if fuel consumption is excessive. This procedure will check
air intake stack and air cleaner element for restrictions and fuel lines for leaks or damage.
STEP
1.
IS AIR RESTRICTION INDICATOR IN RED ZONE?
a.
Check air cleaner indicator for air restriction indication.
T0077DAA
Air Cleaner Indicator
Figure 1.
Air Cleaner Indicator.
b.
Inspect air intake stack for restriction.
CONDITION/INDICATION
IS AIR RESTRICTION INDICATOR IN RED ZONE?
DECISION
YES - Perform air cleaner servicing (TM 9-2320-272-10). Go to Step (3) to verify problem is solved.
NO - Go to Step (2).
TM 9-2320-272-23-1
0020
0020-1
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