TM 5-3805-291-23-1
THEORY OF OPERATION - CONTINUED
0003 00
ENGINE - CONTINUED
d.
Coolant Temperature Regulator. Coolant temperature regulator is a full flow bypass type used to control coolant
outlet temperature. When engine is cold, coolant temperature regulator is closed, allowing coolant to flow through
bypass tube from return manifold, bypassing radiator. Coolant goes directly to water pump for recirculation. As
coolant temperature increases, coolant temperature regulator begins to open, directing some coolant to radiator and
bypassing remainder to water pump inlet. At full engine operating temperature, coolant temperature regulator
opens, allowing all coolant flow to radiator and water pump. This route provides maximum heat release from cool-
ant. A vent line is recommended from manifold to radiator overflow tank to provide cooling system venting.
427-C1717
0003 00-9
