MIL-DTL-13791G
c.
Observe output voltage at 1800 rpm.
d.
Reset breaker points (class I only).
e.
Apply trace of approved high temperature grease on breaker cam (class 1 only).
f.
Apply one or two drops of approved light preservation oil on breaker lever pivot (class 1 only).
g.
Apply three or four drops of approved light preservation oil on felt wick under rotor (class 1
only).
4.10.7 Polarity - class 2 distributors. To determine conformance to 3.5.5, apply reverse polarity to
the class 2 distributor, connected and operated as described in 4.10.3, except that no leads shall be
connected to the peak voltage measuring device. A reverse polarity voltage of 30 V shall be applied 10
consecutive times for 1 minute, at 4-minute intervals.
4.10.8 Transient voltage. To determine conformance to 3.5.6, the class 2 distributor shall be tested
at 200ºF and subjected to a properly polarized transient voltage of 240 V dc above ground for 50 5 ms
duration. The voltage shall be applied to the input terminals of the distributor 10 consecutive times at 1
minute intervals
4.10.9 Waterproofness.
4.10.9.1 Saline submersion. To determine conformance to 3.5.7.1 in salt water, the distributor shall
be tested in accordance to a or b.
a. The distributor assembly shall be subjected to procedures as specified, the component with
its electrical connections, shall be submerged in a container with the uppermost surface a
minimum of one inch below the surface of the saline solution and installed in the chamber.
The component shall be carefully observed during its entire period of submersion and shall
be operated while submerged for 30 minutes at hill rated current
and voltage. The chamber shall be evacuated to a pressure six pounds below atmospheric
so as to apply a minimum of six pounds per square inch (psi) in internal pressure to all voids
within the component. Pretest performance shall be recorded.
b. The distributor assembly shall be tested as specified in 4.10.9.1a, except that air
pressurization and evacuation may be applied directly to the interior of the distributor that has
an access port for this purpose. The test chamber shall not be required. The distributor shall
be submerged in an open tank of water. Distributors, of qualified design that do not include
access ports, shall not be altered for the purpose of using this method.
4.10.9.2 Freshwater submersion. To determine conformance to 3.5.7.1 in freshwater, the distributor
shall be tested in accordance with a or b.
a. The distributor shall be subjected to procedures specified (see 3.5.7.1). Pretest performance
shall be recorded.
b. The distributor shall be tested as specified in 4.10.9.2a, except that air pressurization may be
applied directly to the interior of the distributor that has an access port for this purpose. The
test chamber shall not be required. The distributor shall be submerged in open tank of water.
Distributors of qualified design that do not include access ports shall not be altered for the
purpose of using this method.
4.10.10 Corrosion resistance. To determine conformance to 3.5.7.2, distributor shall be subjected to
the procedure specified in method 101 of MIL-STD-202 for a total of 200 hours. Subsequently, the
distributor shall be examined for conformance to 3.6.
4.10.11 Fungus resistance. To determine conformance to 3.5.7.3, distributor shall be subjected to
the procedure specified in ASTM-G21 for a total of 90 days. Subsequently, the distributor shall be
examined for conformance to 3.6.
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