TM 5-3810-300-24&P-3
13.3
Fuel, Oil and Coolant Specifications
Figure 3
Coolant Filter Elements
Replaceable elements are available with various
chemical inhibitor systems. Care should be used in the
selection of elements relative to inhibitor compatibility
with coolant solutions shown in Fig. 2.
Problems have developed from the use of the
magnesium lower support plate used by some
manufacturers in their coolant filters. The magnesium
plate will be attacked by solutions which will not be
detrimental to other metals in the cooling system. The
dissolved magnesium will be deposited in the hottest,
zones of the engine where heat transfer is most critical
(Fig. 3). The use of aluminum or zinc in preference to
magnesium is recommended to eliminate this type of
deposit.
Figure 4
A high chloride coolant will have a detrimental effect on
use in Detroit Diesel engines.
The non-chromate
the water softening capabilities of systems using ion-
systems can be used with either water -or ethylene glycol
exchange resins.
Accumulations of calcium and
antifreeze solutions and provide corrosion protection, pH
magnesium ions removed from the coolant and held
control and water softening. Some of the approved non-
captive by the zeolite resin can be released into the
chromate inhibitor systems offer the additional
coolant by a regenerative process caused by high
advantage of a simple on site test to determine
chloride content solutions.
protection level and, since they are added directly to the
coolant, require no additional hardware or plumbing.
Bulk Inhibitor Additives
ANTIFREEZE
Commercially packaged inhibitor systems are available
which can be added directly to the engine coolant or to
When freeze protection is required, an ethylene glycol
bulk storage tanks containing coolant solution. Both
base permanent antifreeze should be used. An inhibitor
chromate and non-chromate systems are available and
system is included in this type of antifreeze
care should be taken regarding inhibitor compatability
with other coolant constituents (Fig. 2).
A non-chromate inhibitor system is recommended for
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