ENGINE
L3301, L3901, L4701, WSM
1-M4
4. COOLING SYSTEM
[1] THERMOSTAT
This thermostat uses a wax-pellet type. When
temperature goes up, wax in metal container (pellet)
changes to a liquid from a solid.
The volume starts to expand in this process. As
spindle is fixed, pellet goes down and valve goes down.
There is a jiggle valve on the top depending on the
specification.
When you put coolant and thermostat is closed,
coolant can not go in easily because air at the engine
side can not go out.
The jiggle valve helps to remove air from this hole,
and then coolant can go in easily.
9Y1211012ENM0005US0
(1) Jiggle Valve
(2) Valve
(3) Bypass Valve
(4) Piston
(5) Pellet
(6) Wax
(A) When The Valve is Closed
(B) When The Valve is Opened
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