MIL-DTL-62186C
c. Internal oil leakage during any of the 600 hour cycles shall not exceed 24.4 in3
(400 cm3).
d. External oil leakage shall be not greater than 0.03 in3 (0.49 cm3) per hour.
e. Except as specified in Table I, condition (g), ambient temperature shall be 225
5F (107 2.8C). Inclined operation shall be at ambient room temperature with
the alternator motor driven at no load and not excited during the last 60 hours of
each of the 600 hour cycles. The alternator drive end shall be tilted down 45
from horizontal for 30 hours and tilted up 45 form horizontal for 30 hours.
4.3.7.1.1 Oil contamination.
4.3.7.1.1.1 SOFTC-2A constituents. The composition of SOFTC-2A shall be as follows:
a. Sixteen parts by weight of carbon black with an average particle size of
85 nanometers (nm).
b. Two parts by weight of ferric oxide with 95% of the particles within the range of
0 to 5 micrometers (m).
c. Four parts by weight of polyvinyl (PV) resin.
d. Seventy-eight parts by weight of MIL-PRF-2104.
4.3.7.1.1.2 Preparation of SOFTC-2A. The preparation of SOFTC-2A shall be as
follows:
a. All of the carbon black and 20 to 25% of the test oil shall be placed in a
mechanical mixer and mixed at a slow speed.
b. The mixture from (a) shall be milled over a conventional paint roller mill. The
resultant paste shall be collected directly from the mill into a container having an
additional 25% of the original quantity of oil. The milled slurry and the oil shall
be mixed until homogeneous.
c. A dry-mix of the remaining solid constituents (the PV resin and ferric oxide),
shall be prepared. The slurry from (b) shall be slowly added until a stiff paste is
obtained. The balance of the slurry and the remainder of the lubricating oil shall
be added to this paste and mixed until homogeneous.
4.3.7.1.1.3 Application of SOFTC-2A. SOFTC-2A shall be used in the endurance test as
specified in table VI.
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