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 438 of 1313
ENGINE OVERHEATS - Continued
T1015DAA
Figure 5.
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
(12) 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 (12) to verify problem is solved.
YES - Aftercooler tubes leaking. Tighten or replace aftercooler tubes (Volume 2, WP
0299). Go to Step (12) to
verify problem is solved.
YES - Upper radiator hoses leaking. Tighten or replace upper radiator hoses (Volume 2, WP
0286). Go to
Step
(12) to verify problem is solved.
YES - Radiator leaks. Replace radiator (Volume 2, WP
0281). Go to Step (12) 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 (12) to verify problem is solved.
YES - Vent or manifold hoses or fittings leaking. Tighten or replace radiator vent and manifold hoses or
fittings (Volume 2, WP
0278). Go to Step (12) to verify problem is solved.
YES - Air compressor coolant tube leaking - Tighten or replace coolant tube or fittings (Volume 2, WP
0284).
Go to Step (12) to verify problem is solved.
YES - Engine oil cooler coolant tube leaking - Tighten or replace coolant tubes or fittings
M939/A1 (Volume 2, WP
0233), M939A2 (Volume 2, WP
0229). Go to Step (12) to verify problem is solved.
NO - Go to Step (5).
TM 9-2320-272-23-1
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0028-7
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