M978 Tanker Maintenance Procedures Instructions (Cont)
Replace any screw, nut, or fitting with damaged threads. Inspect tapped holes for thread
damage. If cross-threading is evident, retap hole for next oversize screw or stud. If retapping will
weaken part, replace part.
Reshape elongated mounting holes to round and drill to receive bushing with required inner
diameter. Stake bushing in place with center punch.
When installing studs, use proper driver. Before driving stud, inspect hole for chips. Blow out
foreign matter, coat threads with a film of antiseize compound (Item 17, Appendix C), and start
stud by hand.
Remove protective grease coatings from new parts before installation.
Lubricate all preformed packings with thin coat of oil (Item 47, Appendix C) before installation.
To replace a preformed packing, stretch packing and place into position. Rotate component on
flat surface and uniformly press packing into position.
Remove all traces of old gasket and sealant before installing new gasket. During installation, coat
both sides of gasket with adhesive-sealant (Item 6, Apendix C).
When replacing coupling gaskets, lubricate with a thin coat of grease (Item 34, Appendix C)
Coat oil seals evenly with oil (Item 47, Appendix C) or grease (Item 36, Appendix C) before
installing. Install oil seals applying even force to outer edge of seal. If oil seals are to be installed
over keys or splined shafts, use guide to prevent sharp edge of keyway or splines from cutting
seal. Construct guides of very thin gage sheet metal and shape to required diameter. Make sure
guide edges are not sharp and are bent slightly inward so they do not cut seal.
Lubricate bearings before assembly with lubricant used in the related housing or container to
provide first run-in protection until lubricant from the system can reach bearings.
When mounting bearings on shafts, always apply force to inner races. When mounting bearings
in housing, always apply force to outer race.
Use suitable lifting device, jack, or other aid when lifting heavy components.
c. Follow these cleaning instructions when working on tanker components:
Adhesives, solvents, and sealing compounds can burn easily, can give off
harmful vapors, and are harmful to skin and clothing. To avoid injury or death,
keep away from open fire and use in well-ventilated area. If adhesive, solvent,
or sealing compound gets on skin or clothing, wash immediately with soap and
Compressed air used for cleaning and drying purposes will be reduced to 30 psi
(207 kPa) and used only with chip guarding and personal protection equipment
to avoid injury.
Eye protection is required during all grinding operations to avoid serious injury.
Soak parts in solvent (Item 57, Appendix C), and wash away deposits by slushing or spraying.
When necessary, brush with oval paint brush moistened in solvent. Use a jet of dry compressed
air to dry parts, except bearings, after cleaning. Bearings must drip and air dry.
Do not use wire brushes, abrasive wheels, or compounds to clean parts, unless specifically
approved in the detailed instructions.
Do not clean rubber parts in dry cleaning solvent. Wipe clean with a clean, dry, lint-free cloth.
Electrical parts, such as coils, junction blocks, and switches, should not be soaked or sprayed
with cleaning solutions. Clean these parts with clean lint-free cloth moistened with dry cleaning