Engine
SHOP MANUAL MT26-31 - 06.2005
Tier-3 710655-
Ch 1 page 131
The engine have a double thermostat.
When a double thermostat are used they have the same
opening temperature as standard.
The thermostats use wax as the temperature-sensitive me-
dium.
At coolant temperatures below the opening temperature 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 thermostat, the by-pass channel
is closed and all coolant flows through the thermostats and on
to the radiator.
If temperature equilibrium occurs within the operating range of
the thermostats, i.e. between the temperature limits for fully
closed and fully open thermostat, the thermostat valves will
assume 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 radia-
tor.
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
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