TM   5-2815-241-34&P CLEANING   -   CONTINUED CASTINGS 1. Scrape  all  gasket  material  from  mating  surfaces. 2. Clean inner and outer surfaces of castings, and all areas subject to oil and grease, with drycleaning solvent (item 16, appendix B). 3. Remove sludge, rust, and gum deposits from castings using a stiff brush. WARNING Particles blown by compressed air are hazardous. Make certain the airstream is directed away from user and other personnel in the area. Compressed air used for cleaning purposes shall not exceed 30 psi (207 kPa). User must wear safety goggles or face shield to prevent injury. 4. Use clean, dry, compressed air to blow out and dry all tapped holes in castings. OIL  PASSAGES Particular attention must be given to all oil passages in castings and machined parts. All oil passages must be clean and free of obstruction. 1. Clean passages with a suitable piece of wire or probe to break up any sludge or gum deposits. CAUTION Do not allow drycleaning solvents to come in contact with seals or flexible hoses. These cleaners cause leather, rubber, and synthetic materials to dry out, rot, and lose pliability. 2. Wash passages by flushing with drycleaning solvent (item 16, appendix B). 3. Dry passages by blowing them out with compressed air. OIL  SEALS  AND  FLEXIBLE  HOSES Clean seals and flexible hoses with lubricating soap (item 15, appendix B) and water. BALL  BEARINGS 1. Refer to TM 9-214, Inspection, Care, and Maintenance of Antifriction Bearings, for information on care and maintenance of bearings. 2. Bearings  require  special  cleaning.  After  removing  surface  oil  and  gum  deposits,  place  bearings in hot oil, 140°F (60°C), to loosen hardened oil or grease. Wipe bearings dry; do not use compressed air. After cleaning, coat bearings with a light film of lubricating oil (item 12, appendix B), and wrap to protect from dust, dirt, and foreign matter, until parts are inspected and  assembled. 2-4