F-F-351F
following the system-cleaning process, new, type I, class 1, style B filter shall be used for testing
the media migration.
4.6.2.3 Type IV filter elements. To determine conformance to 3.5.2.2, each element to
be tested shall be installed in its applicable test filter body (see figure 1) and tested as the filters in
4.6.2.2, except that the test conditions of table VII shall be in effect.
TABLE VII. Media migration test conditions for type IV filter elements.
Volume of oil
Strainer housing
Slot area of
Flow
in system
volume
strainer
Element
gal/min
gallons
cubic inches
square inches
class
(liters/min)
(liters)
(cubic centimeters) (square centimeters)
1
1.5 (5.7)
1 (3.8)
15.5 (254)
1.6 (10)
2
3 (11.4)
2 (7.6)
31 (508)
3.2 (21)
3
6 (22.7)
5 (18.9)
62 (1016)
6.4 (41)
4
30 (113.6)
25 (94.6)
310 (5080)
32.1 (207)
4.6.3 Antidrain-back leakage test. To determine conformance to 3.5.3, the following test
has been designed to evaluate the performance of the built-in antidrain valve in new and used
spin-on type filters with respect to leak back drainage during a period of engine shut down.
Basically, the test consists of installing a filter on its base and applying a given static head to the
system through a pipe fastened onto the base outlet and measuring any leakage passing the valve
device in a specified period of time.
4.6.3.1 Test condition. The following are conditions under which antidrain-back leakage
tests shall be conducted: The test oil used shall be equal to a mixture of 60% SAE 20 oil
conforming to API Service Designation SA and 40% kerosene conforming to ASTM D3699.
The mixture shall be a 3.6-5.8 square millimeter per second (mm2/s) viscosity rating at
70°F (21°C), and be equivalent in flow characteristics to SAE 10 at 180°F. During test period the
test oil shall be maintained at a temperature of 70° + 5°F (21° ± 3°C).
4.6.3.2 Test apparatus and preparation. The apparatus shown in figure 2 shall be used for
this test. The filter shall be base mounted by screwing proper thread sized insert into filter head
base until the "O" ring is firmly seated and the filter gasket compressed to its recommended
torque.
4.6.3.3 Test procedure. The following leakage test shall be performed: Purge the filter
by opening valves "A" and "B" to pump test oil through the filter until it is free of air bubbles and
then return the test oil collected back into the reservoir. If a used filter is being tested and the test
oil was excessively contaminated, discard and replace with clean test oil. The antidrain-back
valve (device) must be actuated a minimum of five times during purging cycles. After purging,
close the valve "B", then open valve "C", and fill the pressure head column using the pump. Fill
17
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