Figure 6-27.Oil temperature regulator.
to the pressure gauge indicating oil pressure within the
Oil Temperature Regulator
The oil temperature regulator (fig. 6-27) must be
used in diesel engine lubricating systems, prevents oil
temperature from rising too high in hot weather, and
assists in raising the temperature during cold starts in
winter weather. It provides a more positive means of
controlling oil temperature than does cooling by
radiation of heat from the oil pan wells.
The regulator uses engine coolant in the cooling
system to regulate the temperature of the oil and is made
up of a core and housing. The core, through which the
oil circulates, is of cellular or bellows construction and
is built to expose as much oil as possible to the coolant
that circulates through the housing. The regulator is
attached to the engine so that the oil will flow through
the regulator after passing through the pump. As the oil
passes through the regulator, it is either cooled or
heated, depending on the temperature of the coolant and
then is circulated through the engine.
Some military vehicles use an oil cooler (fig. 6-28)
that consists of a radiator through which air is circulated
by movement of the vehicle or by a cooling fan. Oil
from the engine is circulated through this radiator and
back to the sump or supply tank. The radiator acts to
cool the oil only in this system. It will not heat oil in a
Figure 6-28.Oil cooler.