DRESSTA 32501, Operator'S Manual

Page: 108 / 177

SECTION 5
MAINTENANCE
Page 20
TD-15H DRESSTA
COOLING SYSTEM
Total hardness: Not to exceed 170 parts per million to prevent scale deposits. Water containing
dissolved magnesium and calcium (the usual reason for water hardness) above the specified
amount will cause scale deposits to develop in the engine.
Chlorides – Not to exceed 40 parts per million to prevent corrosion.
Sulfites – Not to exceed 100 parts per million to prevent corrosion.
Dissolved solids – Not to exceed 340 parts per million to minimize sludge deposits, scale
deposits and corrosion.
If any of the requirements cannot be met, use distilled, de-ionized or de-mineralized water. To
determine if local water supplies meet these standards, water treatment laboratories can test
water samples. Softened water that is prepared using common salt (sodium chloride) contains
excessive amounts of chlorides and should not be used.
5.8.2. ANTIFREEZE
Low silicate ethylene glycol antifreeze is recommended. The antifreeze should contain no more
that 0.1[%] anhydrous alkali metasilicate. Low silicate antifreeze is recommended to avoid the
formation of silica gel (hydro-gel). This gel formation can occur when cooling system contains an
over concentration of high silicate antifreeze and/or supplemental coolant additive. DO NOT use
methanol or alcohol as antifreeze because of its low boiling point. Antifreeze may retain its freeze
protection for more than one season but coolant conditioners must be added to maintain corrosion
protection. Antifreeze formulated with metoxy propanol, or propylene glycol is not recommended
for this system.
IMPORTANT: Do not mix different types of antifreeze solutions. Mixed solutions make it
impossible to determine the protection against freezing.
IMPORTANT: Antifreeze containing sealer or anti-leak additives should not be used in this system.
Sealer or anti-leak additives will plug the coolant filter and cause plugging problems in the cooling
system.
WARNING! Use extreme caution when adding coolant to a hot radiator to avoid
being burned. Wear gloves and goggles and keep face away from the filler neck.
A table included in Engine Operation and Maintenance Manual shows percentage of antifreeze
concentration required for various temperatures.
5.8.3. INHIBITORS / CONDITIONERS
All cooling system inhibitors, including those in antifreeze solutions, become depleted through
normal operation. If the inhibitors in antifreeze are allowed to become depleted, the antifreeze
becomes corrosive and attacks and coats the metallic surfaces of the cooling system. If the
concentration is too high it causes plugging problems in the cooling system, which reduces heat
transfer. Cooling system conditioners, which contain these inhibitors, must be added or filters
replaced to maintain corrosion protection.
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