HOW-TO SECTION
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 following additives are
not
recommended
for use in MBE 900
engines.
Soluble Oils —
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%
concentration of soluble oil increases
fi
re deck temperature 6%. A 2.50%
concentration increases
fi
re deck
temperature 15%. The use of soluble
oil additives may result in engine
overheating and/or failure.
Chromate —
Chromate additives are
not approved for use in Detroit Diesel
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 chromium-inhibited coolant must
be chemically cleaned with
Power
Cool
dry chemical cooling system
cleaner/conditionerrefer to section
Cleaners (or equivalent sulfamic
acid/sodium carbonate cleaner) and
fl
ushed.
Coolant Inhibitor Test Intervals
The coolant inhibitor level should be
checked at the intervals listed in Table
16.
Service Application
Inhibitor Test Interval
Long Haul — Highway Trucks and Motor
Coaches — operates more than 60,000
miles (100,00 km) per year
20,000 Miles (32,000 Km)
Short Haul — City Transit — operates up
to 60,000 miles (100,000 km) per year.
15,000 miles (25,000 Km)
Severe Service — Fire Truck or
Crash/Rescue Vehicle — operates up to
6,000 miles (9,600 km) or under severe
conditions.
6,000 Miles (9,600 Km) 300 hours
or 1 year, whichever comes first
Table 16 Required Coolant Inhibitor Test Intervals
108
All information subject to change without notice.
(Rev. 04/08)
DDC-SVC-MAN-0040 0704
Copyright © 2008 DETROIT DIESEL CORPORATION
Summary of Contents for MBE 900
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