MIL-DTL-13791G
3.5.1.1 Class 2 low input voltage. The class 2 distributor must withstand operation at any steady
state system input voltage from zero to 18 V dc, of correct polarity, without impairing performance when
3.5.1.2 Class 2 high input voltage. The class 2 distributor will withstand operation for one hour at
steady state system input voltage of not less than 30 V dc and nor more than 40 V dc, of correct polarity,
3.5.2 Timing performance. The distributor will provide voltage output at each output terminal, in turn,
in regular rotary sequence. Peak voltage output will occur within 1º of rotation for each point of
actuation (see 6.3).
3.5.3 Dielectric strength. The insulation materials must exhibit no loosening, cracking, chafing,
charring, burning, smoking, nor reduction in dielectric strength after distributor assembly operation, with
two output leads connected to ground and remaining leads connected to the spark gap set at eight
millimeters, with 32 V dc input. Subsequently, the distributor assembly must conform to 3.5.1
(see 4.10.5).
3.5.4 Endurance. The distributor will be operated and must conform to either 3.5.4.1 or 3.5.4.2 as
applicable (see 4.10.6).
3.5.4.1 Class I distributor assembly. The class I distributor, including distributor shaft to crankshaft
coupling, will operate for 600 hours with no maintenance except resetting of breaker points at 100 hour
intervals, and lubrication of breaker cam, breaker lever pivot and felt wick under rotor. Subsequently, the
3.5.4.2 Class 2 distributor assembly. The class 2 distributor, including distributor shaft to crankshaft
coupling, will operate for 1500 hours with no maintenance. Subsequently, the distributor assembly must
3.5.5 Polarity, class 2 distributor. The class 2 distributor, will operate in a negatively grounded
system, and will be inoperable during reversed polarity. Subsequent to applications of reversed polarity,
3.5.6 Transient voltage. The distributor (class 2) will undergo input of correctly polarized 240 V dc
transient in 200ºF ambient air temperature. Subsequently, the distributor assembly will operate as
3.5.7 Environment.
3.5.7.1 Waterproofness. The distributor will undergo, and must pass, waterproofness test. The
component shall be submerged in tapwater, with the component uppermost surface a minimum of one
inch below the surface of the water. The component shall be checked for leaks, there shall be no bubbles
escaping from the interior of the component when the test chamber is evacuated to a pressure six pounds
below atmospheric by applying 6 psi internal pressure for one minute while submerged. The internal
pressure shall be obtained by applying vacuum over the water. When the component is a starting motor,
the pinion opening shall be sealed or covered to achieve the internal pressure. Bubbles which are the
result of entrapped air on the exterior surfaces of the component shall not be considered a leak
(see 4.10.9).
3.5.7.2 Corrosion resistance. The distributor will be tested for a period of 200 hours in accordance
with ASTM-B117. Subsequently, the distributor must operate as specified in 3.5.1 and must conform to
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