TM10-3930-660-34 b.  External Engine Cleaning. (1) Protect all electrical equipment that could be damaged by the steam or moisture before steam cleaning. (2) Cover all openings before steam cleaning. (3) After cleaning, dry and apply a light coat of oil to all parts subject to rust. (4) Blow out all tapped (threaded) holes with compressed air to remove dirt and cleaning fluid. c.  Disassembled Parts Cleaning. (1) Place all disassembled parts in wire baskets for cleaning. (2) Dry and cover all cleaned parts. (3) Place parts on or in "racks" and hold for inspection or repair. (4) All parts subject to rusting must be lightly oiled and wrapped. (5) Keep all related parts and components together.  Do not mix parts. d.  Castings. (1) Clean inner and outer surfaces of castings and all areas subject to grease and oil with cleaning solvents.  Refer to TM9-247. (2) Use a stiff brush to remove sludge and gum deposits. (3) Blow out all tapped (threaded) holes with compressed air to remove dirt and cleaning fluid. e.  Oil Passages.  Particular attention must be given to all oil passages in castings and machined parts.  Oil passages must be clean and free of any obstructions. (1) Clean passages with wire probes to break up any sludge or gum deposits. (2) Wash passages by flushing with any solvents.  Refer to TM9-247. (3) Dry passages with compressed air. f.  Oil Seals, Electrical Cables, and Flexible Hoses. CAUTION Washing  oil  seals,  electrical  cables  and  flexible  hoses  with   dry   cleaning   solvents   or mineral spirits will cause serious damage or destroy the material. (1) Wash electrical cables and flexible hose with water and mild soap solution and wipe dry. 2-19