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SERIES 50 OPERATOR'S GUIDE
Methyl Alcohol-Based
Antifreeze —
This coolant
must not be used because of its effect
on the non-metallic components of
the cooling system and its low boiling
point.
Methoxy Propanol-Based
Antifreeze —
This coolant must not
be used because it is not compatible
with the fluoroelastomer seals found
in the cooling system.
Glycol-based Coolants
Formulated For HVAC —
These coolants formulated for
heating/ventilation/air conditioning
(HVAC) should not be used. These
coolants generally contain high levels
of phosphates, which can deposit
on hot internal engine surfaces and
reduce heat transfer.
Additives Not Recommended
The additives in the following sections
are
not recommended
for use in Series
50 engines cooling systems.
Soluble Oil Additives —
These
additives are not approved for use
because a small amount of oil
adversely affects heat transfer. For
example, a 1.25% concentration
of soluble oil increases fire
deck temperature 6%. A 2.50%
concentration increases fire deck
temperature 15%. The use of soluble
oil additives may result in engine
overheating and/or failure.
Chromate Additives —
These
additives are not approved for use
because chromate additives can form
chromium hydroxide, commonly
called “green slime.” This, in turn,
can result in engine damage due to
poor heat transfer. Cooling systems
operated with chromium-inhibited
coolant must be chemically cleaned
with
Power Cool
dry chemical
cooling system cleaner/conditioner
(or equivalent sulfamic acid/sodium
carbonate cleaner) and flushed.
Coolant Maintenance
Coolant maintenance involves
checking the coolant inhibitor levels
at regular intervals and checking to
ensure that the coolant has the proper
concentration of SCA.
Coolant Inhibitor Test Intervals
—
The coolant inhibitor level
should be checked at the intervals
listed in Table 25. If topping off is
needed, add coolant which is identical
to the initial fill coolant.
All information subject to change without notice.
(Rev. 01/ 04)
103
6SE550 0401
Copyright © 2004 DETROIT DIESEL CORPORATION