AS kind of coolant used in the engine and the kind of
or by-passes the heat exchanger and flows directly to
raw water used. Soft water plus a rust inhibitor or a high
the water pump, depending on the coolant temperature.
boiling point type antifreeze should be used as the
While passing through the core of the heat exchanger,
the coolant temperature is lowered by raw water, which
When foreign deposits accumulate in the heat
is drawn by the raw water pump from an outside supply.
exchanger to the extent that cooling efficiency is
The raw water enters the heat exchanger at one side
impaired, such deposits can, in most instances, be
and is discharged at the opposite side.
removed by circulating a flushing compound through the
fresh water circulating system without removing the heat
To protect the heat exchanger element from electrolytic
exchanger. If this treatment does not restore the
action, a zinc electrode is located in both the heat
engine's normal cooling characteristics, contact an
exchanger inlet elbow and the raw water pump inlet
authorized Detroit Diesel Allison Service Outlet.
elbow and extends into the raw water passage.
The length of time a heat exchanger will function
satisfactorily before cleaning will be governed by the
Fig. 18. Typical Cooling System for V-Type Engine