F-F-351F
the column slightly above the 24 in. (61 centimeters (cm)) mark and shut off pump and close the
valve "A". Remove the cap on the leakage drain tube and allow the trapped test oil to drain for
2 minutes. Then adjust the pressure head to maintain a 24 in. level throughout the test period. At
the end of the 2 minute period, place a graduate under the drain tube and record the leakage rate.
The pressure head column should be filled from the top to maintain the necessary 24 in. level.
Record the leakage rate in milliliters (mL) at 10 minute intervals for the first hour and hourly
thereafter. Acceptable leakage shall not exceed 10 mL per hour, nor more than 20 mL per
12 hour period.
4.6.4 Additive removal. To determine conformance to 3.5.4, type I, class 3 filters; type
II, class 3 filter elements; and type IV filter elements shall be tested for oil additive removal by use
of a testing apparatus consisting of an oil reservoir, a suitable filter body, and an oil circulating
system provided with oil pressure, temperature, and flow-rate indicators and controls. For type I
filters and type II filter elements, five quarts of new (unused) additive test oil (see 4.5.5), plus
sufficient test oil to fill the filter body, and for type IV filter elements, the volume of new (unused)
additive test oil specified in table VII shall be circulated for 20 hours through the filter (without
element). Inlet pressure to the filter body for type I filter and type II filter element testing shall be
30 psi. The circulation of oil for type IV element testing shall be at the rate as specified in table
VII. Oil temperature shall be held at 180°F. At the end of this 20 hour period, the additive
content of the oil shall be determined by the sulfated residue method (average of three
determinations) conforming to ASTM D874. This 20 hour circulation through the test retention
by the oil of not less than 95% of its original value. During each 20 hour circulation, 5 quarts (qt)
(4.7 liters (L)) of new oil, plus sufficient oil to fill the filter body, shall be used for each run when
testing type I filters and type II filter elements. The quantity of new oil used when testing the type
IV filter elements shall be as specified in table VII. The second of the two consecutive readings
showing an additive retention by the oil of not less than 95% of the original content shall be
considered as the blank. A sample filter element shall be installed in the filter body and this
complete filter assembly shall be substituted for the standard filter body in the oil circulating
system. New test oil, in the applicable amount specified above, shall be added to the test
apparatus and circulated through the element for 20 hours at an inlet pressure to type II filter
elements of 30 psi and at the applicable rated flow for the type IV elements (see table VII), with
the oil being held at a temperature of 180°F. At the end of this 20 hour period, the oil shall be
examined for its additive content by the sulfated residue method (average of three determinations)
conforming to ASTM D874. Correct for the blank and express as percent of original additive
content of the new oil.
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