Figure 84. Reverse flushing radiator.
Figure 33. Testing thermostat.
fins are connected to the copper tubes to give an
extended surface through which heat can be dissipated.
These tubes must be kept clean on the inside and the
fins must be free of dirt on the outside so that maximum
heat transfer can take place in the radiator.
b. Blowing out between the fins of the radiator,
using compressed air in a direction opposite to
Figure 35. Reverse flushing engine.
that of the fan circulated air, will serve to keep
the cooling surfaces of the core free of dirt and
e. W ater forms rust due to its natural tendency to
combine chemically with iron and air in the
c. Every 500 hours of operation, clean and flush
system. Use a rust inhibitor to reduce the need
the radiator and coolant system with clean
for cleaning and flushing.
f. The addition of corrosion inhibitors is not
d. W herever possible, use only soft, clean water in
necessary if an antifreeze containing a rust
the coolant system. Hard water will cause scale
inhibitor is used.
to form in the radiator and the engine water
jackets and cause poor heat transfer. If the use
of hard water cannot be avoided, use an
approved water softener.