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38
Maintenance Section
Coolant Specifications
• 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 6 and refer to
table 7 .
Table 6
Ethylene Glycol Concentration
Freeze
Concentration
Protection
−37° C (−29° F)
50 Percent
−52° C (−62° F)
60 Percent
(1)
Boiling protection is increased with the use of a pressurized ra-
diator. A system with a 1 bar (14.5 psi) pressure cap at sea lev-
el, will increase the final boiling point of 50 percent coolant to
130° C (266° F).
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
Freeze
Concentration
Protection
−32° C (−26° F)
50 Percent
(1)
Boiling protection is increased with the use of a pressurized ra-
diator. A system with a 1 bar (14.5 psi) pressure cap at sea lev-
el, will increase the final boiling point of 50 percent coolant to
130° C (266° F)
Boil Protection
(1)
106° C (223° F)
111° C (232° F)
Boil Protection
(1)
106° C (223° F)
To check the concentration of glycol in the coolant,
measure the specific gravity of the coolant.
Coolant Recommendations
• 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
The following three glycol-based coolants are
recommended for use in Perkins 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
Do not use a commercial coolant/antifreeze that only
meets the ASTM D3306 specification. This type of
coolant/antifreeze is made for light automotive
applications.
NOTICE
A commercial heavy-duty antifreeze that meets
"ASTM D4985" specification requires a treatment
with an SCA at the initial fill. Read the label or the in-
structions that are provided by the manufacturer of
the product.
SEBU8430-02
Extended Life Inhibitor
a coolant that relies
a coolant in which the
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