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MIL-T-18232B(AS)
3.30.9.2.5.1
TEMPERATURE REGULATION. - Temperature regulating valves for
Drawing AN4124 and AN4125 cooler installations shall be in
accordance with Drawing AN4103 meeting requirements of Specification MIL-V-5636.
Temperature regulating valves for other types of oil coolers shall be subject to
specific approval by NAVAIR. All temperature regulating valves used in reciprocat-
ing engine installations shall be compatible with and readily converted for satis-
factory use of either grade 1100 or grade 1065 oils.
3.10.9.2.6
DRAINAGE PROVISIONS. - A main drain valve at the lowest point
in the engine oil-in-line and a tank sump drain shall be pro-
vided to obtain complete drainage of the oil tank. The drain valve for tank sump
shall be one-half inch with Drawing MS33656 outlet port. The main drain valve
shall be of the same size as the engine oil-in-line with Drawing MS33656 outlet
port except that the valve need not exceed a size 1 1/2 inches. Drain valves shall
be self-locking.
3.10.9.2.6.1
OIL COOLER DRAINAGE. - The oil cooler drain plug shall be
accessible for drainage and oil shall drain clear of the target.
Complete-oil cooler drainage is not required, however, oil coolers shall be
drained to a "wet" weight not exceeding 50 pounds to facilitate removal.
3,10.9.2.6.2
ENGINE OIL DRAIN. - Engine oil drain plugs shall be readily
accessible and shall permit oil to drain from the engine clear
of the target.
3.10.9.2.7
DEAERATION PROVISION. - The expansion and foaming space
requirements of 3.10.9.2.2.1 are representative of' reasonable
tank design and lubricating system characteristics. Deaeration provisions may
be incorporated with a reduction of the foam space requirements of 3.10.9.2.2.1.
Additional deaeration provisions and/or increase in foam space shall be provided
as necessary to prevent excessive tank pressures or overboard discharge of oil due
to the engine foaming characteristics or compromise of tank design characteristics.
3.10.9.2.8
VENT AND BREATHER SYSTEM. - Main oil tanks shall be vented to
the appropriate engine connection. Liquid pockets shall not
form in the oil tank vent lines. If no vent connection is furnished on the engine,
the oil tank shall be vented overboard and designed to prevent discharge of solid
oil from the vent outlet. The inlet to the vent line shall be uncovered within
the angular limits of climb and dive specified for the fuel system of the target.
When a breather connection is provided on the engine, breather pipes shall be
designed to conduct oil vapors from the engine breather to the open air clear of
the exhaust outlets. The discharge line shall be located on the under side of
the engine accessory compartment, so that approximately ambient air pressure is
imposed on the outlet. Particular attention shall be given to the prevention of
vent and breather icing at low temperature. Vent and breather lines which pass
through unheated areas shall be lagged or provided with means of heating to
prevent ice accumulation within the lines.
3.10.10
FUEL SYSTEM
36

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