Quantcast Ball and Needle Bearings -- Continued

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TM 9--2815--247--34 0012 00--3 GENERAL MAINTENANCE INSTRUCTIONS -- CONTINUED 0012 00 CLEANING INSTRUCTIONS -- CONTINUED Ball and Needle Bearings -- Continued WARNING CAUTION Do not immerse sealed type ball bearings in dry--cleaning solvent (P--D--680, Type II), or hot oil. Entrance of clean- ing agent will destroy lubricants sealed in bearing at time of manufacture. Loss of lubricant will result in premature failure of bearing and possible severe damage to the en- gine. Clean sealed ball bearings by wiping the exterior surfaces with a clean cloth moistened in dry--cleaning solvent (item 5, WP 0100 00). Compressed air must never be used in cleaning or drying of ball or needle bearings. Dam- age to bearings will result from spinning of bearing by air blast. Refer to TM 9--214 for information on inspection, care, and maintenance of bearings. Painted Parts The reconditioning of painted parts should be a matter of good judgment. Parts that appear to be in good condition after cleaning need not be stripped and repainted in their entirety, but should be cleaned and designated for touch-- up only. Parts that are rusted, or otherwise devoid of paint, must be stripped to bare metal. Rubber composition shroud seals must be removed and discarded before the parts can be stripped of paint. INSPECTION General The engines are precision--built and the repair standards tables have been fixed at extremely close limits. The fol- lowing general instructions apply to all inspection procedures. a.   Extreme care must be exercised in all phases in inspection. b.   Inspect finish of all parts. Mark all parts that require refinishing. Repair Standards Numbers are used on the exploded views to locate points of measurement for repair limits. Each table contains the maximum and minimum limits of new or repair parts. The clearances will automatically be achieved if the mating parts are within the dimensional tolerances listed in the tables. In some cases, a part that is out of dimensional tolerance may be used, providing the mating part has been carefully selected and, when mated, is within the maxi- mum clearance specified in the wear limits column of the tables. The wear limits indicate the point at which parts may be worn before replacement, in order to assure maximum service and minimum replacement. Normally, all parts which have not worn beyond dimensions shown in the “Wear Limits” column or are not damaged from corro- sion will be approved for service.


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