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 450 of 1313
LOSS OF COOLANT - Continued
T0404DAA
Figure 2.
Engine Cooling System (M939A2).
CONDITION/INDICATION
ARE RADIATOR, HOSES, HOSE CONNECTIONS, AND DRAIN VALVES LEAKING?
DECISION
YES - Turbocharger coolant lines leaking. Tighten or replace coolant lines (Volume 2, WP
0249). Go to
Step
(4) to verify problem is solved.
YES - Coolant hoses or tubes leaking. Tighten or replace coolant hoses, clamps, or fittings
M939/A1 (Volume 2, WP
0280), M939A2 (Volume 2, WP
0285). Go to Step (4) to verify problem is solved.
YES - Aftercooler tubes leaking. Tighten or replace aftercool tube (Volume 2, WP
0299). Go to Step
(4) to verify
problem is solved.
YES - Upper radiator hoses leaking. Tighten or replace upper radiator hoses (Volume 2, WP
0286). Go to
Step
(4) to verify problem is solved.
YES - Radiator leaks. Replace radiator (Volume 2, WP
0281). Go to Step (4) to verify problem is solved.
YES - Water pump leaks. Perform water pump maintenance M939/A1 (Volume 2, WP
0293),
M939A2 (Volume 2, WP
0292). Go to Step (4) to verify problem is solved.
YES - Transmission oil cooler assembly leaks. Repair or replace transmission oil cooler
components (Volume 3, WP
0382). Go to Step (4) to verify problem is solved.
YES - Air compressor coolant tube leaking. Tighten or replace coolant tube and fitting (Volume 2, WP
0284).
Go to Step (4) to verify problem is solved.
NO - Go to Step (2).
TM 9-2320-272-23-1
0029
0029-3
Back to Top
