Kubota Z400-B Handbuch Seite 121

Antifreeze
If the cooling water freezes, the engine cylinder block,
cylinder head and radiator may crack. In cold weather before
the temperature drops below O°C (32°F), drain out the water
after operating or add a proper amount of antifreeze.
• There are two types of antifreeze solutions: permanent
type (PT) and semi-permanent type (SPT). For the
KU BOT A engines, be sure to use the permanent type.
• When antifreeze is used for the first time, fill and drain
clean water twice or three times so as to completely clean
the inside of the radiator.
• The procedure for mixing water and antifreeze differs
according to the make of the antifreeze and the ambient
temperature. Basically, it should be refered to SAE J1034
standard, more specifically also to SAE J814c.
• Mix the antifreeze and water, then pour the mixture
into the radiator.
Vol
%
Freezing point
Boiling point
antifreeze
°c
OF
°c
OF
40
50
60
70
-24
-37
-52
-64
-12
-34
-62
-84
106
108
111
114
222
226
232
238
"At 760mmHg pressure (atmospheric). A higher boiling
point is obtained by using a radiator pressure cap which
permits the development of pressure within the cooling
system.
• IMPORTANT
• When the anti-freeze is mixed with water, the anti-freeze
mixing ratio must be less than 50%.
• Do not use antifreeze during hot weather to keep the
engine performance since the cooling water boiling point
rises.
• NOTE:
• The above data represents industrial standards that necessi ­
tate a minimum glycol content in the concentrated
antifreeze.
• When the cooling water level drops due to evaporation,
add water only. In case of leakage, add antifreeze and
water in the specified mixing ratio.
• Antifreeze absorbs moisture. Keep unused antifreeze in
a tightly sealed container.
• Do not use radiator cleaning agents when antifreeze has
been added to the cooling water.
(Antifreeze contains an anticorrosive agent, which will
react with the radiator cleaning agent forming sludge
which will affect the engine parts.)
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