MIL-PRF-25478D
3.5.1 Compatibility. All materials shall be compatible with the lubricating oil and
preservative compounds specified in the acquisition document (see 6.2). No copper or
magnesium shall be used.
3.6 Component parts. Unless otherwise specified in the acquisition document (see 6.2),
the oil cooler shall consist of the core assembly, oil inlet and outlet ports, a drain device, a
temperature control device, a surge protection device, and a bypass warm-up passage. The
temperature control device, a surge protection device, and a bypass warm-up passage can be
combined into one device as described in MIL-PRF-5636.
3.6.1 Castings. f metal is chosen and a casting process is used, then the casting shall be
clean, free from blow-holes, porosity, cracks, and other defects.
3.6.2 Temperature control device. The oil cooler shall incorporate a temperature control
device which, in conjunction with a bypass warm-up passage, controls the temperature of the oil
at the oil cooler outlet to the value specified in the acquisition document (see 6.2). The
temperature control device shall be a removable part of the oil cooler assembly.
3.6.3 Surge protection device. The surge protection device shall be used on the bypass
warm-up passage outlet and shall be a removable part of the oil cooler assembly. The surge
protection device shall open at the minimum differential pressure relief setting and shall limit the
maximum differential pressure as specified in the acquisition document (see 6.2).
3.7 Interfaces.
3.7.1 Fittings. The oil inlet and outlet ports shall permit connection of fittings
conforming to MS33786.
3.7.2 Dimensions and weight. The overall dimensions and weight shall be as specified
in the acquisition document (see 6.2).
3.7.3 Locking thread parts. Threaded parts shall be secured to prevent loss during
operation. Self-locking nuts, shall be in accordance with NASM33588. Staking and the use of
lockwashers shall not be permitted.
3.8 Performance.
3.8.1 Static pressure. There shall be no leakage or permanent distortion of the oil cooler
when subjected to hydrostatic pressure as specified in the acquisition document (see 6.2).
3.8.2 Bypass warm-up passage pressure drop without air flow. Unless otherwise
specified in the acquisition document (see 6.2), the oil pressure drop through the bypass warm-up
passage shall not exceed 8 psi.
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