Bottom Bypass System - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service

[2] BOTTOM BYPASS SYSTEM

Bottom bypass system is introduced in V3 series for
improving the cooling performance of the radiator.
While the temperature of coolant in the engine is low,
the thermostat is held closed and the coolant is allowed
to flow through the bypass pipe and to circulate in the
engine.
When the temperature exceeds the thermostat valve
opening level, the thermostat fully opens itself to prevent
the hot coolant from flowing through the bypass into the
engine.
In this way, the radiator can increase its cooling
performance.
(1) Thermostat
III-S-79
Engine
(A) Bypass Opened
(B) Bypass Closed
W1013406