M-4
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG WSM
DIESEL ENGINE
2. COOLING SYSTEM
[1] BOTTOM BYPASS SYSTEM
Bottom bypass system is introduced in 03-M Series
for improving the cooling performance of the radiator.
While the temperature of coolant in the engine is low,
the thermostat (1) 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 (1) 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.
W1013406
(1) Thermostat (A) Bypass Opened
(B) Bypass Closed
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