Operators Manual

Table Of Contents
Methoxy propanol-based antifreeze must not be used in Detroit™ engines
because it is not compatible with fluorocarbon elastomer seals found in the
cooling system.
Glycol-based coolants formulated for Heating/Ventilation/Air Conditioning
(HVAC) must not be used in Detroit™ engines. These coolants generally contain
high levels of phosphates, which will form deposits on hot internal engine
surfaces, reduce heat transfer, and cause water pump seal leaks.
Waterless-type coolants must not be used.
Nitrite Organic Acid Technology (NOAT)must not be used in Detroit™
engines because with poor maintenance components become more vulnerable.
Non-Formulated Additives NOT Permitted
The following additives should not be used in Detroit™ engines:
Soluble Oils: Soluble oil additives are not approved for use in Detroit™ engine
cooling systems. A small amount of oil adversely affects heat transfer. For
example, a 1.25% concentration of soluble oil increases the fire deck temperature
6%. A 2.50% concentration increases the fire deck temperature 15%. The use of
soluble oil additives may result in engine overheating and/or failure.
Chromates: Chromate additives are not approved for use in Detroit™ engine
cooling systems. 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 a chromate-inhibited coolant must be
chemically cleaned with Detroit™ Genuine Coolant Twin Pack cooling system
cleaner/conditioner (or equivalent sulfamic acid/sodium carbonate cleaner) and
flushed.
Phosphate Inhibitors: Phosphate has tendency to form deposits on surfaces
transferring high heat which ultimately affect cooling capabilities. Phosphate
deposits on water pump seals will result in coolant leakage across seal faces.
Maintenance
Topping Off Coolant
The coolant level should be checked daily and at each service interval. If topping
off is necessary, add coolant which is identical to the initial–fill coolant. Extended
Life Coolants (ELC) also known as Organic Acid Technology Coolants (OAT)
should be topped-off with a coolant of the same formulation; Standard Life
Coolants (SLC) also known as Conventional should also be topped-off with a
coolant of the same formulation.
Silicated Organic Acid technology (Si-OAT) should only be topped off with
Silicated Organic Acid technology (Si-OAT) listed on DFS 93K217. Do not mix
with other coolants even if they are the same color.
How to Procedures
174 All information subject to change without notice.
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