TM 5-2420-230-24-2
Fan, Cooling (008-040)
B3.9 and B5.9 Series Engines
Page 8-38
Section 8 - Cooling System - Group 08
Fan, Cooling (008-040)
General Information
If the fan is belt-driven, a slipping belt will result in a slower
fan speed and reduced cooling. A malfunctioning auto-
matic belt tensioner can be the problem.
to make sure they are not causing excessive belt vibration
and slippage.
Interruption of the circuit to an electrically driven fan can
result in insufficient airflow and can cause the engine to run
hot.
NOTE: Make sure that the temperature sensor is function-
ing correctly.
Some applications use thermatic fans. These fans operate
only as needed to keep the coolant at the correct tem-
perature. If the fan does not operate when the coolant
temperature increases, the engine will run hot. If the fan
does not shut off when coolant temperature decreases, the
engine will run cold.
NOTE: Make sure the temperature sensor is functioning
correctly.
Remove (008-040-002)
3/8-Inch Square Drive
Lift the tensioner to relieve tension in the belt.
Remove the belt. Refer to Procedure 008-002.
NOTE: The belt tensioner is spring-loaded and must be
pivoted away from the drive belt. Pivoting in the wrong
direction can result in damage to the belt tensioner.
L-1094