TASK 70-60-01-620-002
1 . General.
Antifriction bearings are precision assemblies, and must be protected against both atmospheric and mechanical damage at all times. Special handling techniques for bearings are described in TASK 70-14-00-620-003, Handling of Bearings, cleaning methods are described in TASK 70-22-01-110-046, Special Cleaning Procedure No. 1 - Cleaning of Bearings Using a Water Based Cleaning Solution, and inspection criteria are described in TASK 70-33-01-220-004, Antifriction Bearing Inspection. The duration of the storage period after cleaning and inspection determines the type of preservation to be used.
2 . In-Process Preservation.
Subtask 70-60-01-620-021
CAUTION:
DO NOT USE COMPRESSED AIR TO BLOW EXCESS SOLVENTS OR LUBRICANTS FROM ASSEMBLED BEARINGS AS SPINNING CAN DAMAGE THE BEARING.
A.During the disassembly of the engine, and throughout all subsequent operations, preserve bearings in accordance with the following recommendations.
(1)Apply preservation oil C02-050   to bearings within 15 minutes of the time that they become accessible at disassembly.
(2)Protect bearings in assemblies from dirt and moisture by covering or sealing sumps and tube openings with a moisture barrier material such as grade A grease-proof paper or polyethylene sheet.
(3)Apply preservation oil C02-050   to bearings as soon as they are removed from assemblies, and place bearing in a clear plastic bag or wrap in grade A grease-proof paper C10-009  . Send to bearing processing area at once.
(4)After cleaning, and during and after inspection, it is strongly recommended that a fingerprint neutralizing step be done. This will ensure that no fingerprint oils or residue remains on the bearing after the inspection.
NOTE:
The fingerprint neutralizing step must be done if the bearing comes in contact with human skin or skin oils.
(5)Immerse bearing in fingerprint neutralizer C02-054  . Make sure that neutralizer contacts all surfaces. Remove neutralizer by rinsing in Stoddard solvent C04-002   or equivalent, and coat bearing with preservation oil C02-050  .
(6)Coat bearing with preservation oil C02-050   after installation on a shaft or in a housing. When preservation oil is applied to a bearing installed in a sump, let any excess oil drain from the scavenge port before sealing the sump openings.
(7)Wear clean white nylon gloves or plastic gloves, or apply protective hand cream C10-064   when handling bearings. Use heat-resistant gloves to handle heated rings.
3 . Preservation After Processing.
Subtask 70-60-01-620-022
A.If bearing is to be returned to engine assembly within 7 days, immerse it in preservation oil C02-050  , drain, and place in a clean plastic bag or wrap in grade A grease-proof paper C10-009  . Place in a protective container until installation.
B.If bearing is to be placed in storage for an extended period of time, it should be preserved with preservative C02-024  , then wrapped in grade A grease-proof paper C10-009  , glossy side toward the bearing. Store bearings in covered individual containers until used.
NOTE:
An alternative method of extended period storage may be used with preservation oil C02-050   provided bearings are packed in shrink-wrap or plastic bags to minimize exposure to moisture.