TM-9-2350-274-BD
M109/M110/M578 VEHICLES HOWITZER, MEDIUM, SELF-PROPELLED FULL-TRACKED
TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1984
TM-9-2350-274-BD - Page 87 of 219
TM 9-2350-274-BD
CHAPTER 5
COOLING SYSTEM
BDAR FIXES SHALL BE USED ONLY IN COMBAT
AT THE DISCRETION OF THE COMMANDER
AND SHALL BE REPAIRED BY STANDARD MAINTENANCE PROCEDURES
AS SOON AS PRACTICABLE AFTER THE MISSION IS COMPLETED.
SECTION L General
5-1. General.
The M 109 has a liquid cooling system consisting of a radiator and two fans located to the rear of the
engine. Air is drawn in through an air inlet grille, located immediately in front of the cab. The air passes
over the top of the engine, through the fans and radiator, curves 90 degrees and is discharged
■
through the exhaust grille. Coolant flow is regulated by two thermostats, an inlet and a by-pass
thermostat. The M 110 series/M578 has two radiators and a fan that forces air through the power plant
compartment and the radiators to cool the engine. Cooling system problems may be indicated by a variety
of faults. Typically, the driver’s indicator panel will show overheating. However, sporadic overheating or
constant high temperature indications may indicate an impending major cooling system problem.
5-2. Assessment Procedure.
-fans, . . . . . . . . . . . . . . . . . . . . . . . . go to para 5-4
-fan drive, . . . . . . . . . . . . . . . . . . . . . go to para 5-4
-shroud . . . . . . . . . . . . . . . . . . . . . .
. go to TM 9-2350-276-BD
-ducts . . . . . . . . . . . . . . . . . . . . . .
. . go to TM 9-2350-276-BD
-engine compartment . . . . . . . . . , . . . go to TM 9-2350-276-BD
covers
-radiator, . . . . . . . . . . . . . . . . . . . . . go to TM 9-2350-276-BD
-hoses, . . . . . . . . . . . . . . . . . . . . . . . go to TM 9-2350-276-BD
-fan air intake, . . . . . . . . . . . . . . . . . . go to para 5-4
-fan drive, . . . . . . . . . . . . . . . . . . . . . go to para 5-4
-engine compartment . . . . . . . . . . . . . go to TM 9-2350-276-BD
covers
-engine compartment . . . . . . . . . . . . . go to TM 9-2350-276-BD
seals
Change 3
5-1
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