Operation and maintenance manual

46 SEBU7833-03
Maintenance Section
Refill Capacities
Glycol
Glycol in the coolant helps to provide protection
against the fo
llowing 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 lo
west ambient temperature.
Note: 100 percent pure glycol will freeze at a
temperature o
f −23 °C (−9°F).
Most conventional coolant/antifreezes use ethylene
glycol. Prop
ylene glycol may also be used. In a 1:1
mixture with water, ethylene and propylene glycol
provide similar protection against freezing and
boiling. Se
e Tables 17 and 18.
Table 17
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 ex-
ceed 50 percent glycol because of propylene glycol’s
reduced heat transfer capability. Use ethylene glycol
in conditions that require additional protection against
boiling or freezing.
Table 18
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 – Ac
ommercial heavy-duty
coolant/antifreeze that meets “ASTM D4985”
specifications
NOTICE
Do not use a commercial coolant/antifreeze that on-
ly meets the ASTM D3306 specification. This type of
coolant/antifreeze is made for light automotive appli-
cations.
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/antifreeze. This ratio may be increased to 1:2
water to glycol if extra freezing protection is required.
Note: A commercial heavy-duty coolant/antifreeze
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 19
Coolant Service Life
Coolant
Type
Service
Life
Perkins ELC
12,000 Service Hours
or Six Years
Commercial Heavy-Duty
Coolant/Antifreeze that
meets “ASTM D4985”
3000 Service Hours or
Two Years
Perkins POWERPART
SCA
3000 Service Hours or
Two Years
Commercial SCA and
Water
3000 Service Hours or
Two Y ea
rs
Extend
ed Life Coo lant (ELC)
Perkins provides Extended Life Coolant (ELC) for
useint
he following applications:
•
Heavy-duty spark ignited gas engines