Allis-Chalmers WD Operating Instructions And Repair Parts Illustrations page 15

If soda is used', mix with water thoroughly
before placing in radiator. Operate engine
about 2 hours. Drain and flush thoroughly
with clean water. Soluble oil is beneficial to
the cooling system. It will not prevent the
accumulation of lime but will retard such
formation. This water soluble oil may be
secured from your Allis-Chalmers dealer.
TO DRAIN COOLING SYSTEM - Open the drain
cock located on lower radiator outlet and the
drain cock on motor block ahead of carburetor.
CAUTION: In freezing weather be sure to
drain both places. Loosen radiator cap to
prevent system from air locking, which will
retard draining. Stay near tractor and make
sure system is completely drained.
ANTI-FREEZE SOLUTION
during freezing weather it is advisable to
fill the cooling system with anti-freeze
solution. If low octane fuel is used, alcohol
should not be used in the cooling system,
because of its low boiling point. When low
octane fuel is used, a good grade of permanent
anti-freeze with a higher boiling point is
recommended because of the higher operating
temperature with this type of fuel.
FAN BELT ADJUSTMENT - To adjust loosen
the generator adjusting screw and move the
generator away from cylinder block until
about 1" free movement at "A " is obtained.
Extreme tightness will reduce the life of the
belt, generator bearings and fan shaft bearing.
If fan belt bottoms in the sheaves indicating
belt wear the belt should be replaced.
- If tractor is used