MIL-PRF-45085D
3.3 Design and construction. The oil cooler assembly and core assemblies shall conform
to all interface and envelope dimensions on Drawings 8690239, 7356770, 7356769 and listed
parts, as applicable (see 4.5.1 and 4.5.2).
3.3.1 Corrosion and flux control. All core assemblies shall be internally and externally
treated to remove all corrosion and excess flux. This treatment shall be followed by a rinsing and
neutralizing treatment, and the core protected from further contamination during subsequent
operations (see 4.5.1 and 4.5.2).
3.3.2 Internal preservative treatment. Following the operation to remove corrosion and
other contaminants, the core shall be flushed with grade 10W preservative oil in a manner which
will insure complete internal coverage. After preservative oil has drained, openings shall be sealed
(see 4.5.1 and 4.5.2).
3.3.3 Pretreatment, priming and painting. Core assemblies shall be cleaned, pretreated
and primed. Paint color shall match 16187 of FED-STD-595 (see 4.5.2).
3.3.4 Interchangeability. All parts of the oil cooler assemblies shall be interchangeable
with parts of other manufacturers having the same military part number (see 4.5.2).
3.4 Performance. All assembly units shall conform to the requirements specified in 3.4.1
through 3.4.5 (see 4.5.4).
3.4.1 Leakage. When tested as specified in 4.5.4.1 and 4.5.4.2, the assembly unit shall
show no evidence of leakage under cyclic and noncyclic conditions.
3.4.2 Hydrostatic pressure. When tested as specified in 4.5.4.3, the assembly unit shall
show no evidence of leakage.
3.4.3 Heat rejection. Heat rejection shall be determined with air flowing through all three
cores and oil flowing through the applicable arrangement as shown in figure 1 (see 4.5.4.4).
3.4.3.1 Heat rejection, core arrangement A. When tested as specified in 4.5.4.4.1, heat
rejection, air pressure drop, and oil pressure drop shall conform to performance curves shown on
figures 2, 5, and 8. Heat rejection shall be not more than 10 percent (%) below capacity curve.
Air and oil pressure drop shall not be more than 10% above capacity curve.
3.4.3.2 Heat rejection, core arrangement B. When tested as specified in 4.5.4.4.2, heat
rejection, air pressure drop, and oil pressure drop shall conform to performance curves shown on
figures 3, 6, and 8. Heat rejection shall be not more than 10% below capacity curve. Air and oil
pressure drop shall be not more then 10% above capacity curve.
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