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Maintenance Section
Fluid Recommendations
• Plugging of radiators, coolers, and small passages
Glycol
Glycol in the coolant helps to provide protection
against the following conditions:
• Boiling
• Freezing
• Cavitation of the water pump
For optimum performance, Perkins recommends a
1:1 mixture of a water/glycol solution.
Note: Use a mixture that will provide protection
against the lowest ambient temperature.
Note: 100 percent pure glycol will freeze at a
temperature of −13 °C (8.6 °F).
Most conventional antifreezes use ethylene glycol.
Propylene glycol may also be used. In a 1:1 mixture
with water, ethylene and propylene glycol provide
similar protection against freezing and boiling. Refer
to Table 6 and refer to table 7 .
Table 6
Ethylene Glycol
Concentration
50 Percent
60 Percent
NOTICE
Do not use propylene glycol in concentrations that
exceed 50 percent glycol because of the reduced
heat transfer capability of propylene glycol. Use ethyl-
ene glycol in conditions that require additional protec-
tion against boiling or freezing.
Table 7
Propylene Glycol
Concentration
50 Percent
To check the concentration of glycol in the coolant,
measure the specific gravity of the coolant.
Freeze Protection
−36 °C (−33 °F)
−51 °C (−60 °F)
Freeze Protection
−29 °C (−20 °F)
Note: Some commercially available coolants are
based on alternative fluids, such as 1, 3-propanediol
(beta-propylene glycol, PDO), glycerin (glycerol) or
mixtures of these alternatives with ethylene/
propylene glycols. At the time of publication of this
document no industry standard exists for coolants
based on these chemicals. Until such standard/
specifications are published and evaluated by
Perkins, use of PDO, glycerine or other alternative
coolants is not recommended in Perkins diesel
engines.
Coolant Recommendations
• ELC
• SCA
Supplement Coolant Additive
• ASTM
American Society for Testing and
Materials
ELC - extended life coolant. A coolant that relies on
organic inhibitors for corrosion and cavitation
protection. Also called OAT coolant (Organic Acid
Technology).
SCA - supplemental coolant additive, concentrated
inorganic inhibitor package.
Extender - concentrated organic inhibitor package.
Conventional Coolant - a coolant that relies on
inorganic inhibitors for corrosion and cavitation
protection.
Hybrid Coolant - a coolant in which the corrosion and
cavitation protection is based on a mixture of organic
and inorganic inhibitors.
The following coolants are recommended for used in
Perkins diesel engines:
Preferred – Perkins ELC
Acceptable – A commercial heavy-duty antifreeze
that meets "ASTM D6210" or "ASTM D4985"
specifications.
NOTICE
The Perkins industrial engines with a NOx reduc-
tion system must be operated with a minimum
30% volume glycol-water mixture, Perkins recom-
mends 50% volume glycol-water mixture of water
and glycol. The 50% concentration allows the
NOx reduction system to operate correctly at
high ambient temperatures.
M0076814-03
Extended Life Coolant
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