4-23. GENERAL INSPECTION INSTRUCTIONS.

TM 9-2320-304-14&P 4-146 Organizational Maintenance Instructions (Cont) 4-23. GENERAL INSPECTION INSTRUCTIONS. a. Cleaning. Clean all parts before inspection. Check for defects such as physical distortion, wear, cracks, and pitting. b. Sealing Surfaces. Inspect all surfaces in contact with gaskets, packings, or seals for nicks and burrs. If any defect is found, remove it before assembly. c. Tubing, Hoses, and Fittings. Inspect all hose surfaces for broken or frayed fabric. Check for breaks caused by sharp kinks or contact with other parts of the truck. Inspect fittings, tubing, mating surfaces, and threads for nicks, cracks, scratches, and other damage. Replace any defective part. After assembly and during initial truck operation periods, check for leaks. d. Electrical Parts. Inspect all wiring harnesses for broken, chafed, or burned wiring. Inspect all terminal connectors for loose connections and broken parts. e. Metal Parts. Visually inspect all castings and weldments for cracks. Parts that carry a great load should receive magnetic particle inspection. Critical non-ferrous parts may be inspected with fluorescent penetrant. 4-24. GENERAL REPAIR INSTRUCTIONS. a. Exterior Parts. Chassis and exterior painted parts may be resurfaced when paint is damaged or where parts have been repaired. NOTE Polished or machined steel parts not protected by cadmium, tin, copper, or other plating or surface treatments require protection. Bare metal surfaces must be free of moisture when protective coating is applied. b. Protecting Parts. Protect bare steel surfaces from rust when not actually undergoing repair work. Dip parts in, or spray them with, corrosion preventive compound (Item 7, Appendix F). Aluminum parts may require protection in atmospheres having a high salt content. c. Screws, Nuts, and Fittings. Replace any screw, nut, or fitting with damaged threads. Inspect tapped holes for thread damage. If cross-threading is evident, retap the hole for the next oversize screw or stud. If the retapping will weaken the part, or if the cost of the part makes retapping impractical, replace the part. Chasing the threads with a properly size tap or die may be adequate. d. Stud Installation. Use a proper driver when installing studs. A worn stud driver may damage the end thread. Then a chasing die must be used before a nut can be screwed on. This procedure will remove cadmium plating and allow corrosion. Before installing a stud, inspect the hole for chips. Blow out foreign matter and start stud by hand. Before final insertion, coat thread with a film of antiseize compound (Item 6, Appendix F). Install stud to proper “setting height”, which is the total projecting length. e. Dents. Straighten minor body dents by bumping with a soft-faced hammer while using a wooden block backing. f. Sheet Metal Repair. Repair minor skin cracks by installing patches.