4
In the case of liquid-cooled engines, special
attention must be paid to the treatment and
control of the coolant, as the engine may
otherwise become damaged as a result of
corrosion, cavitation and freezing.
The treatment of the coolant is carried out by adding a
cooling system protectant to the cooling water.
The cooling system must be continuously monitored,
see 5.1. In addition to checking the coolant level, this
also involves checking the concentration of the cooling
system protectant.
The cooling system protectant concentration can be
checked with commercially available testers (example:
gefo glycomat
®
).
4.3.2 Coolant treatment 4.3.3 Cooling system protectants
4.3.1 Quality of water for coolant
in the recirculating water
system
The values listed below must not be exceeded.
In order to examine the quality of your water, a test case
can be ordered from DEUTZ under Order No. 1213
0382.
Water quality min max
ph value at 20 °C
/68° F
6.5 8.5
Chloride ion content
[mg/dm3]
- 100
Sulphate ion content
[mg/dm3]
- 100
Total hardness
[°dGH]
3 20
Cooling system protectant Water
max. 45 Vol.% 55%
min. 35 Vol.% 65%
If nitrite-based cooling system
protectants are mixed with
amine-based agents, danger-
ous nitrosamines are formed.
Cooling system protectants must
be disposed of in an environmen-
tally-friendly manner.
DEUTZ cooling system protectants must be purchased
in drums under Order No. 01011490 (5 litres) or 1221
1500 (210 litres). These are nitrite, amine and phos-
phate-free, and provide effective protection against
corrosion, cavitation and freezing.
If the above mentioned cooling system protectant is
unavailable, the following products may be used in
exceptional cases.
Manufacturer Product designation
AVIA AVIA Antifreeze Extra
ARAL Antifreeze Extra
BASF Glysantin G 48
DEA DEA kylarfrostsskydd
SHELL SHELLGlycoShell
The cooling system protectant in the coolant should not
fall below or exceed the following concentration:
Filling volume, see Chapter 9.1.
The use of other cooling system protectants, e.g. chemi-
cal anti-corrosion agents, is possible in exceptional
cases. Consult DEUTZ Service.
The use of anti-corrosion oils is not permitted.
4.3 Coolant Operating Media
4
18 20 22 25 27 30 32 35
35 –22 6,3 7,0 7,7 8,75 9,5 10,5 11,2 12,3
40 –28 7,2 8,0 8,8 10 10,8 12 12,8 14
45 –35 8,1 9,0 9,9 11,3 12,2 13,5 14,4 15,8
50 –45 9,0 10 11 12,5 13,5 15 16 17,5
Protective agent
[Liters]
Cooling system capacity *)
[Liters]
Cooling System Protection
*) For coolant capacity of your engine, see Section 9.1.
Note: Consult head-office regarding figures in the grey field.
Protective
agent
[% by vol.]
Protection
against freezing to
[°C]
Operating Media 4.3 Coolant
Property of American Airlines
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