MAINTENANCE INTRODUCTION (CONT).
Use protective covers on open housings, lines, engine inlets, exhaust ducts, and other openings as soon as
possible after disassembly to prevent moisture and foreign matter from entering engine. Wrap all parts in clean paper or
dip parts in preservative oil, (item 27, Appendix E) or equivalent.
Cap or tape over all open tubes, hoses, fittings and engine component openings as soon as parts are
Do not use tape to close off fuel or oil openings. Sticky surface of tape can mix with fuel and oil
and cause engine malfunctions.
Use suitable containers to catch fuel or oil when removing hoses and fittings. Dispose of fuel and oil in
accordance with local policy.
Remove and handle components carefully.
Inspect parts as removed for breaks, dents, cracks, surface defects or other obvious damage.
Remove burrs from gear teeth with a fine-cut file.
Remove residue from bearing races with crocus cloth (item 8, Appendix E).
Welding and brazing processes may be used to repair cracks in external parts, such as brackets, panels,
and framework. Because of time required and the chance of subsequent failure, such repairs should be attempted only
when replacement parts are not available. Welding and brazing of castings and running parts or parts under great stress
will only be done in emergencies.
When installing studs in engine block 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 plating and allow
corrosion. Before installing a stud, inspect hole for chips. Blow out foreign matter and start stud by hand. Before final
insertion, coat thread with a film of anti-seize compound. Install stud to proper "setting height," which is the total
Replace all broken, worn, or burned electrical wiring. Wires with broken strands must be replaced.
Replace all broken, frayed, crimped, or soft flexible hoses. Replace stripped or damaged fittings. Replace
entire flexible hose if fittings are damaged. Hose clamp should not crimp hoses.
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 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.
Reshape elongated mounting holes to round and drill to receive bushing with required inner diameter.
Stake bushing in place with center punch.
Remove protective grease coatings from new parts before installation.