Engine
SHOP MANUAL
Ch 1 page 189
The engine have a double thermostat.
When a double thermostat are used they have the same open-
ing temperature as standard.
The thermostats use wax as the temperature-sensi tive medium.
At coolant temperatures below the opening tem perature of the
thermostats, nearly all the coolant circulates between
the engine’s coolant passages and the coolant pump without
passing through the radiator.
When the coolant temperature in the engine is higher than the
temperature for fully open thermo stat, the by-pass channel
is closed and all coolant flows through the thermostats and on
to the radia tor.
If temperature equilibrium occurs within the oper ating range of
the thermostats, i.e. between the temperature limits for fully
closed and fully open thermostat, the thermostat valves will as-
sume a corresponding intermediate position.
Some of the coolant will then be directed to the coolant pump
without being cooled and the remainder directed to the radiator.
Thermostat and thermostat housing
1. Termostat housing
2. Thermostat
3. Gasket
4. Cover
5. Stud
6. Flange nut
Open thermostat -
full flow to radiator
1. Coolant from the engine
2. By-pass channel (back to the coolant pump)
3. Outlet to the radiator
Closed thermostat -
return to coolant pump trough
by-pass channel
3
2
1
1
Figure 367
Figure 368
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