Perkins 403J-E17T Operation And Maintenance Manual page 69

M0094137-02
• Formation of gel compounds
• Reduction of heat transfer
• Leakage of the water pump seal
• 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
50 percent by volume of glycol in the finished coolant
(also referred to as 1:1 mixture).
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 distilled or deionized water, ethylene and
propylene glycol provide similar protection against
freezing and boiling. Refer to Table 13 and refer to
table 14 .
Table 13
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 14
Propylene Glycol
Concentration
50 Percent
Freeze Protection
−36 °C (−33 °F)
−51 °C (−60 °F)
Freeze Protection
−29 °C (−20 °F)
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, use of
PDO, glycerine, or other alternative coolants are not
recommended in Perkins engines.
To check the concentration of glycol in the coolant,
measure the specific gravity of the coolant.
Coolant Terminology
• ELC Extended Life Coolant. A coolant that
relies on organic inhibitors for corrosion and
cavitation protection. Also known as Organic Acid
Technology (OAT) coolant.
• ELI
• SCA Supplement Coolant Additive,
concentrated inorganic inhibitor package
• ASTM American Society for Testing and
Materials
• Conventional Coolant
on inorganic inhibitors for corrosion and cavitation
protection
• Hybrid Coolant
corrosion and cavitation protection is based on a
mixture of organic and inorganic inhibitors.
• Extender concentrated organic inhibitor
package
Coolant Recommendations
The following three glycol-based coolants are
recommended for use in Perkins diesel engines:
Preferred – Perkins ELC
Acceptable – A commercial heavy-duty antifreeze
that meets "ASTM D6210" specifications. Must be
replaced after 2 years.
Adequate – A commercial heavy-duty antifreeze that
meets "ASTM D4985" specifications. Must be
replaced after 1 year.
NOTICE
The Perkins industrial engines must be operated
with a 1:1 (50 Percent) mixture of distilled or de-
ionized water and glycol. This concentration al-
lows the NOx reduction system to operate
correctly at high ambient temperatures.
69
Maintenance Section
Fluid Recommendations
Extended Life Inhibitor
a coolant that relies
a coolant in which the