User Manual

HOW-TO SECTION
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 bo ili ng
point.
Methoxy Propanol-Based
Antifreeze — This coolant must not
be used because it is not com patible
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 gen e rall y contain high level s
of phosph ates, which can deposit
on hot internal engine surfaces and
reduce heat transfer.
Additives Not Recommended
The a ddi tives in th e following sectio ns
are not recommended for use in Ser ies
50 engines cooling systems.
SolubleOilAdditives—
These ad ditives 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 solu ble
oil addit ives may result in engin e
overheating and/or failur e .
Chromate Additives — These
additives are n ot a p proved for use
because chromate additives can form
chromium hydroxide, com monly
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 sulfam ic 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.
104 All information subject to change without notice. (Rev. 01/04)
DDC-SVC-MAN-0058 Copyright © 2004 DETROIT DIESEL CORPORATION