Piper Navajo PA-31 Service Manual page 54

PIPER NAVAJO SERVICE MANUAL
2-57. APPLICATION OF GREASE. Care must be taken when lubricating bearings and bearing surfaces
with a grease gun, to insure that gun is filled with new, clean grease of the grade specified for the particular
application before applying lubricant to the grease fittings.
a. Where a reservoir is not provided around a bearing, apply the lubricant sparingly and wipe off any
excess.
b. Remove wheel bearings from the wheel hub and clean thoroughly with a suitable solvent. When
repacking with grease, be sure the lubricant enters the space between the rollers in the retainer ring. Do not
pack the grease into the wheel hub.
c. Use extra care when greasing the Hartzell propeller hub to avoid blowing the clamp gaskets.
Remove one grease fitting while applying grease to the other fitting.
2-58. APPLICATION OF OIL. Whenever specific instructions for lubrication of mechanisms requiring
lubrication are not available. observe the following precautions:
a.
Apply oil sparingly, never more than enough to coat the bearing surfaces.
b. Since the cables are sufficiently coated by the manufacturer, additional protection for the
prevention of corrosion is unnecessary.
c. Squeeze the magneto cam follower felts at regular inspection periods. If oil appears on fingers, do
not add oil. If the felt is dry, moisten with light oil.
CAUTION
Be careful not to add too much oil, because the excess will be
thrown off during operation and will cause pitting and burning of
the magneto points.
2-59. RECOMMENDED
LUBRICANTS. The engine manufacturer does not recommend oils by brand
W
names. Use a quality brand Aviation Grade Oil of the proper season viscosity. For information on the use of
detergent oil. refer to the latest revision of Lycoming Service Instruction Letter 1014. The proper grades of oil
are listed in lubrication chart information.
2-59a. LUBRICATION OF THREADS. All fittings on external lines, including their points of attachment
at the engine and other components, should be lubricated with the proper lubricant as specified in Table
II-IIa.
The following steps should be followed when applying thread lubricants:
a.
Thoroughly clean threads before applying lubricant.
b. Use selected thread lubricant sparingly.
c.
Apply thread lubricant to male threads only.
d.
Lubricate the first three threads on straight fittings.
e. Do not lubricate the first two threads on tapered fittings. Apply the lubricant to the next three
threads only.
f. Ascertain that lubricant does not enter fittings or flared areas.
g.
Any fittings going to the engine should be lubricated with the type of fluid going through the
lines.
Revised: 9/24/81 HANDLING AND SERVICING
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