Detroit Diesel 60 Series Operator's Manual page 64

ADDITIVES NOT RECOMMENDED
The following additives are not recom-
mended for use in Series 60 engines:
1. Soluble oil additives are not
approved for use in Detroit Diesel
engine cooling systems. A small
amount of oil adversely affects heat
transfer. For example, a 1.25% con-
centration 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 over-
heating and/or failure.
2. Chromate additives are not
approved for use in Detroit Diesel
engine cooling systems. Chromate
additives can form chromium hydrox-
ide, commonly called "green slime."
This, in turn, can result in engine dam-
age due to poor heat transfer. Cooling
systems operated with chromate-
inhibited coolant must be chemically
cleaned with Power Cool Dry Chem-
ical cooling system cleaner/conditioner
(or equivalent sulfamic acid/sodium
carbonate cleaner) and flushed.
MAINTENANCE
Coolant Inhibitor Test Intervals
Coolant inhibitor level should be
checked at the intervals listed in Table
Service Application
On Highway Trucks and Motor Coaches
City Transit Coaches, Pick-up and Delivery
Short Trip, and Emergency Vehicles
Industrial, Continuous Duty Generator Set,
and all Other Applications
Stand-by Generator Set
Table 16. Required Coolant Inhibitor Test Intervals
16. If topping off is needed, add coolant
which is identical to the initial fill coolant.
Supplemental Coolant Additives for
Fully Formulated Coolant
The concentrations of some inhibitors
will gradually deplete during normal
engine operation. SCAs replenish the
protection for cooling system compo-
nents. The coolant must be maintained
with the proper concentration of SCA.
Detroit Diesel Power Cool maintenance
SCAs are recommended. The proper
application of SCA will provide:
pH control.
Restored inhibitor levels to prevent
corrosion.
Water-softening to deter formation of
mineral deposits.
Cavitation protection to protect wet
sleeve cylinder liners.
NOTICE:
Failure to properly maintain coolant
with SCA can result in damage to the
cooling system and its related compo-
nents. Conversely, over-concentration
of SCA inhibitor can result in poor heat
transfer, leading to engine damage.
Always maintain concentrations at
recommended levels. Do not use tra-
ditional SCAs with NOAT coolant.
Inhibitor Test Interval
20,000 Miles (32,000 Kilometers)
6,000 Miles (9,600 Kilometers) or three
months, whichever comes first
500 Hours or three months, whichever comes
first
200 Hours or yearly, whichever comes first
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