TM 5-3895-369-14
5-4. MAINTENANCE INTRODUCTION (CONT).
(6)
Inspect parts as removed for breaks, dents, cracks, surface defects, or other obvious damage.
(7)
Remove burrs from gear teeth with a fine-cut file.
(8)
Remove residue from bearing races with crocus cloth (item 11, appendix E).
(9)
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.
(10)
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 (item 13, appendix E). Install stud to proper “setting height,”
which is the total projecting length.
(11)
Replace all broken, worn, or burned electrical wiring. Wires with broken strands must be replaced.
(12)
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.
(13)
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.
(14)
Reshape elongated mounting holes to round and drill to receive bushing with required inner diameter.
Stake bushing in place with center punch.
(15)
Remove protective grease coatings from new parts before installation.
(16)
To replace a preformed packing, first clean groove, then stretch packing and place into position. Place
component on flat surface and uniformly press packing into position.
(17)
Use a nonhardening pipe thread sealing compound (item 17, appendix E) to join piping.
(18)
Coat both sides of gasket with sealant. Remove all traces of previous gasket and sealant before installing
new gasket.
(19)
Coat oil seals evenly with oil or grease before installing. Install oil seals with seal lip facing in, 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 the keyway or splines from cutting the seal. Construct guides of very thin gauge sheet metal and shape to
the required diameter. Make certain guide edges are not sharp and arc bent slightly inward so they do not cut the seal.
(20)
When mounting bearings on shafts, always apply force to the inner races. When mounting bearings into
housing, always apply the force to the outer races. Lubricate bearings before assembly with lubricant used in the
related housing or container to provide the first run-in until lubricant from the system can reach the bearings.
5-8
