• 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
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 −23 °C (−9 °F).
Most conventional coolants 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. See
Tables 28 and 29 .
Table 28
Ethylene Glycol
Concentration
Freeze
Protection
Boil Protection
50 Percent
−36 °C (−33 °F) 106 °C (223 °F)
60 Percent
−51 °C (−60 °F) 111 °C (232 °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 29
Propylene Glycol
Concentration
Freeze
Protection
Anti-Boil
Protection
50 Percent
−29 °C (−20 °F) 106 °C (223 °F)
To check the concentration of glycol in the coolant,
measure the specific gravity of the coolant.
Coolant Recommendations
The following two coolants are used in Perkins diesel
engines:
Preferred – Perkins Extended Life Coolant (ELC)
Acceptable – A commercial heavy-duty coolant that
meets “ASTM D4985” specifications
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.
Perkins recommends a 1:1 mixture of water and
glycol. This mixture of water and glycol will provide
optimum heavy-duty performance as a coolant. This
ratio may be increased to 1:2 water to glycol if extra
freezing protection is required.
Note: A commercial heavy-duty coolant that meets
“ASTM D4985” specifications MAY require a
treatment with an SCA at the initial fill. Read the label
or the instructions that are provided by the OEM of
the product.
In stationary engine applications and marine engine
applications that do not require anti-boil protection or
freeze protection, a mixture of SCA and water is
acceptable. Perkins recommends a six percent to
eight percent concentration of SCA in those cooling
systems. Distilled water or deionized water is
preferred. Water which has the recommended
properties may be used.
Engines that are operating in an ambient temperature
above 43 °C (109.4 °F) must use SCA and water.
Engines that operate in an ambient temperature
above 43 °C (109.4 °F) and below 0 °C (32 °F) due
to seasonal variations consult your Perkins dealer or
your Perkins distributor for the correct level of
protection.
Table 30
Coolant Service Life
Coolant Type
Service Life
Perkins ELC
6,000 Service Hours or Three
Years
Commercial Heavy-Duty Cool-
ant that meets “ASTM D4985”
3000 Service Hours or Two Years
Extended Life Coolant (ELC)
Perkins provides Extended Life Coolant (ELC) for
use in the following applications:
• Heavy-duty spark ignited gas engines
• Heavy-duty diesel engines
• Automotive applications
50
SEBU7992-05
Maintenance Section
Fluid Recommendations
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