Perkins 4012TESI Series, Руководство пользователя, Страница: 21 / 57

COOLANT
4012/16 Gas, February 1998 17
ENGINE COOLING SYSTEM
To protect the engine cooling system against
corrosion it is essential that the engine
coolant contains suitable additives which will
give the necessary protection.
Caution: untreated water is not suitable.
WATER QUALITY
The water that is mixed with the additive
must have the following characteristics:
Chloride less than 80 PPMV (parts per
million by volume)
Sulphates less than 80 PPMV
Total hardness less than 200 PPMV pH of
water between 7 to 7.5 (i.e. neutral to slightly
alkaline)
ADDITIVES TO WATER
Due to the complexity of the cooling system
it is necessary to use an additive that
contains a balanced package of corrosion
inhibitors.
To achieve the required solution a 50/50 mix
of Shell Safe Premium anti-freeze with water
should be used at all times, even in areas
where frost is unlikely.
This mixture will give frost protection down to
-35°C. In areas where Shell anti-freeze is
unobtainable
contact Perkins Engines
(Stafford) Ltd for advice.
Under no circumstances should an additive
containing nitrites, borates, phosphates,
chromates, nitrates or silicates be used, as
these materials are not compatible with the
materials used in the cooling system.
When mixing the anti-freeze with the water
always
follow the manufacturer's
recommendation which is to add the anti-
freeze to water and mix thoroughly before
adding the mixture to the engine cooling
system.
Mixing water to the anti-freeze can lead to
the formation of gel in the mixture, due to
over concentration, and this can lead to
blockage of water passages and subsequent
loss of water flow causing overheating.
MAINTENANCE OF COOLANT
The water/anti-freeze mixture should be
replaced in operating engines at least once a
year.
It is essential to maintain the coolant at the
correct alkalinity level i.e. the pH should not
increase above 7.5. A hydrometer only
shows the proportion of ethylene glycol.
This is not a measure of protection
against corrosion.
WARNING
ALWAYS STOP
THE ENGINE AND
ALLOW THE PRESSURISED SYSTEM
TO COOL BEFORE REMOVING THE
FILLER CAP. AVOID SKIN CONTACT
WITH ANTIFREEZE BY WEARING
HAND PROTECTION.
FAILURE TO
FOLLOW THE
ABOVE RECOMMENDATIONS MAY
RESULT IN ENGINE DAMAGE AND
WILL INVALIDATE THE ENGINE
WARNING