2-45. GENERAL REPAIR INSTRUCTIONS.
Burrs. Remove burrs from surface teeth with a fine-cut file or crocus cloth.
Exterior Parts. Chassis and exterior painted parts may be resurfaced when paint is damaged, or where
parts have been repaired.
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.
Protecting Parts. Protect bare steel surfaces from rust when not actually undergoing repair work. Dip
parts in, or spray then with, corrosion preventive compound (Item 35, Appendix C). Aluminum parts may require
protection in atmospheres having a high salt content.
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 proper size tap or die may be adequate.
Stud Installation. When installing studs use a proper driver. 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 20, Appendix C). Install
stud to proper setting height, which is the total projecting length.
Dents. Straighten minor body dents by bumping with a soft-faced hammer while using a wooden block
Sheet Metal Repair. Repair minor skin cracks by installing patches.
2-46. GENERAL ASSEMBLY INSTRUCTIONS.
Preparation. Remove protective grease coatings from new parts before installation.
Preformed Packing Installation. Lubricate all preformed packings with a thin coat of lubricating oil
(Item 54, Appendix C) before installing. To install a preformed packing, first clean the groove, then stretch
packing and place into position. Place component on flat surface and uniformly press packing into position.
Ensusre preformed packings are not nicked or torn during assembly.
Use sealing compound sparingly and only on male threads. Do not apply compound on first
two threads to avoid contamination of system from compound. Do not apply compound to
hose connections or fittings with preformed packings. Damage to equipment may result.
Pipe Joints and Fittings. Use sealing compound, sealant, or adhesive as indicated in each maintenance
task. Refer to Para 2-47i for tightening procedure.
Oil Seals. Coat oil seals evenly with oil or grease before installing. Install oil seals with seal lip facing
toward lubricant, applying an even force to outer edge of seal. If oil seals are to be installed over keyed or
splined shafts, use a guide to prevent sharp edge of keyway or splines from cutting the leather or neoprene seal.
Construct guides of very thin gauge sheet metal and shape to the required diameter. Make certain guide edges
are not sharp and are bent slightly inward so they do not cut the seal.
Bearings and Shafts. When mounting bearings on shafts always apply force to the inner races. When
mounting bearings into housing always apply the force to the outer race.