ENGINE
3D-10
Changing Coolant
1. Shut down the engine and remove the ignition
key. Allow the engine to cool completely.
2. Remove the radiator cap and slowly remove the
lower radiator hose (Figure 3D-7). Drain the cool-
ant into a suitable container.
3. Flush the inside of the radiator with fresh water.
4. Reattach the lower radiator hose and fill the radia-
tor with a 50/50 mixture of ethylene glycol base
antifreeze and clean fresh water.
Figure 3D-7. Radiator/Oil Cooler and Radiator
Hoses
5. Install the radiator cap and start the engine follow-
ing the instructions in the Safety & Operation man-
ual.
6. The engine allows air to circulate through the radi-
ator, cooling the antifreeze/water mixture (cool-
ant). If the core becomes clogged with dust and
dirt, or the cooling fins are bent, the radiator will
not cool properly.
7. Remove the dust screen. Using low-pressure
compressed air blow dust and debris from the
radiator core (Figure 3D-8).
NOTICE
It is illegal to dispose of most antifreeze in an inap-
propriate manner. Always dispose of antifreeze
according to local environmental laws and regula-
tions. Contact local environmental personnel for
information on disposal methods.
CAUTION
Always use a mixture of antifreeze and fresh water
in the engine cooling system. Normally a 50/50 cool-
ant mixture will provide freeze protection to -37°F
(-38°C) and boil over protection in an efficient cool-
ing system.
WARNING
Always wear eye protection when using compressed
air. Never use compressed air in excess of 20 psi
(138 kPa) for cleaning purposes. Never point the air
nozzle at another individual; serious personal injury
can occur from contact with compressed air.
CAUTION
Do not use screwdrivers or sharp tools to clean the
radiator core. Sharp edges can damage the core
and cause coolant leaks. Use commercially avail-
able fin tools for repair of bent fins.
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