3Com Caterpillar Commercial Diesel Engine SEBU6251-06 - Manual (Page 26)

26
Maintenance Section
Cooling System Specifications
Table 11
Propylene Glycol
Concentration
Freeze
Protection
Anti-Boil
Protection
50 Percent
−
29

C (
−
20

F) 106

C (223

F)
To check the concentration of glycol, use the
1U-7298 Coolant/Battery Tester (Celsius) or use
the 1U-7297 Coolant/Battery Tester (Fahrenheit).
The testers give readings that are immediate and
accurate. The testers can be used with ethylene
or propylene glycol.
i01096597
Coolant Recommendations
SMCS Code: 1350; 1352; 1395
The following two coolants are used in Caterpillar
diesel engines:
Preferred – Caterpillar Extended Life Coolant (ELC)
or a commercial extended life coolant that meets
the Caterpillar EC-1 specification
Acceptable – A Caterpillar Diesel Engine
Antifreeze/Coolant (DEAC) or a commercial
heavy-duty coolant/antifreeze that meets “ASTM
D4985” or “ASTM D5345” specifications
NOTICE
Do not use a commercial coolant/antifreeze that only
meets the ASTM D3306 or D4656 specification. This
type of coolant/antifreeze is made for light duty auto-
motive applications.
Caterpillar 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.
Note: Caterpillar DEAC DOES NOT require a
treatment with an SCA at the initial fill. Commercial
heavy-duty coolant/antifreeze that meets “ASTM
D4985” or “ASTM D5345” 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. Caterpillar 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.
NOTICE
All Caterpillar diesel engines equipped with air-to-air
aftercooling (ATAAC) require a minimum of 30 percent
glycol to prevent water pump cavitation.
Table 12
Coolant Service Life
Coolant Type Service Life
Caterpillar ELC
6000 Service Hours or
Six Years
Caterpillar DEAC
3000 Service Hours or
Three Years
Commercial Heavy-Duty
Coolant/Antifreeze that
meets “ASTM D5345”
3000 Service Hours or
Two Years
Commercial Heavy-Duty
Coolant/Antifreeze that
meets “ASTM D4985”
3000 Service Hours or
One Year
Caterpillar SCA and
Water
3000 Service Hours or
Two Years
Commercial SCA and
Water
3000 Service Hours or
One Year
i01096605
Extended Life Coolant (ELC)
SMCS Code: 1350; 1352; 1395
Caterpillar provides Extended Life Coolant (ELC) for
use in the following applications:
• Heavy-duty spark ignited gas engines
• Heavy-duty diesel engines
• Automotive applications
The anti-corrosion package for Caterpillar ELC is
different from the anti-corrosion package for other
coolants. Caterpillar ELC is an ethylene glycol
base coolant. However, Caterpillar ELC contains
organic corrosion inhibitors and antifoam agents
with low amounts of nitrite. Caterpillar ELC has
been formulated with the correct amount of these
additives in order to provide superior corrosion
protection for all metals in engine cooling systems.
ELC extends the service life of the coolant to 6000
service hours or six years. ELC does not require
a frequent addition of a Supplemental Coolant
Additive (SCA). An Extender is the only additional
maintenance that is needed at 3000 service hours
or one half of the ELC service life.