FED-STD-791D
5.4 No. 400 emery paper.
5.5 No. 30 grit aluminum oxide.
5.6 Bi-solvent; isopropyl alcohol:acetone - 1:1 [1,3,0].
6. PROCEDURE
6.1 Cleaning procedure.
6.1.1 Test oil tank. The test oil tank should be removed from the stand at the end of each
test. After the deposits have been rated and photographed the tank assembly should be
completely disassembled. The interior of the tank and the immersed part of the heater should
each be thoroughly cleaned by solvents, hand scrubbing, and or mild abrasive blast to remove all
traces of deposits from previous test. An electrical continuity check should be made on the
immersion heaters before the tank is reinstalled on the stand. Instances of apparent electrical
"shorts" in the immersion heater circuit can often be cured by additional air or oven drying.
6.1.2 Test oil pressure and scavenge pumps. The test oil pressure and scavenge pumps
are to be completely disassembled and cleaned to remove all deposits from the previous test.
6.1.3 Oil-out sump. The oil sump located directly below the bearing head should be
disassembled and cleaned with bisolvent followed by ultrasonic cleaning in an oakite/water
mixture, if necessary. Rinse in bisolvent and air dry.
6.1.4 Test oil lines. All of the straight run test oil lines and fittings (elbows, tees) should
be removed from the test oil system and hand reamed with wire brushes having bristles of steel
or other metal except copper in a bath of cleaning solvent. Oil lines with bends greater than
10 should be new at the start of each test.
6.1.5 Oil filter assemblies. All oil filter housings in the test and support oil systems
should be removed and wire brushed in cleaning solvent. A soft fiber brush is usually adequate
in scrubbing the filter elements after a short soaking in a solvent bath.
6.1.6 Gage lines. The oil lines connected to gages on the instrument console require
cleaning with air after each test.
6.1.7 Bearing head. The bearing head should be disassembled as far back as the seal and
all of the removable parts, except the test bearing, are to be thoroughly cleaned by scouring with
No. 400 emery paper, or glass beads (vacu-blasting), and solvent to remove all traces of deposits
from the previous test. In cases of extreme dirtiness, the entire seal assembly should be removed
and the parts solvent cleaned using No. 400 emery paper if necessary.
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