TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Radiator Shutter Assembly (008-049)
Section 8 - Cooling System - Group 08
Page 8-43
Pressure Test (008-047-013)
The system is designed to use the pressure cap to prevent
boiling of the coolant.
Different caps are specified for the two recommended sys-
tems:
System
Cap
A-Normal-Duty 104C [219F]
103 kPa [15 psi]
B-Light-Duty 99C [210F]
48 kPa [7 psi]
Pressure-test the radiator cap.
The pressure cap must seal within the value stated on the
cap, or it must be replaced.
NOTE: An incorrect or malfunctioning cap can result in loss
of coolant and the engine running hot.
Radiator Shutter Assembly (008-049)
General Information
Shutters are designed to control airflow across the radiator.
If the shutters fail to open when needed, the engine can run
hot. Failure of the shutters to close can result in too much
airflow and the engine running cold.
NOTE: Make sure the air temperature sensor is functioning
correctly. Check the air-operated shutter controls. Check
for air leaks. Refer to the equipment manufacturer's ser-
vice manual.
Winterfronts can be used on a charge air cooled engine,
but must be designed to cover the frontal area of the
cooling system partially. A minimum of charge air cooled
frontal area must be left open to air flow.
Winterfronts:
302_ mm
[60_ in]
L-1099
