Piper Navajo PA-31 Service Manual page 466

PIPER NAVAJO SERVICE MANUAL
a. Remove the spinner nose cap ( 1 ) and release the charge.
b. Remove the spinner (2) by removing the safety wire (3) and check nut (4) from the propeller at the
forward end of the forward spinner bulkhead and the screws that secure the spinner to the aft bulkhead (5)
c. Remove the engine cowling. (Refer to Paragraph 8-4.)
NOTE
It is unnecessary to feather blades when removing propeller.
d. If the airplane is equipped with a propeller de-icer system, disconnect electrical leads.
e. Place a drip pan under the propeller to catch oil spillage.
f. Cut the safety wire around the propeller mounting studs and remove the studs from the engine flange.
The nuts are frozen and pinned to the studs, so the studs should turn with the nuts.
g. Pull the propeller from the engine shaft.
h. The spinner bulkhead (5) may be removed.
8-17. CLEANING, INSPECTION AND REPAIR OF PROPELLER.
WARNING
Refer to Piper Service Bulletin No's. 926 and 927, latest revision
of Hartzell Propeller Inc. Service Bulletin No's. 164 and 165, and
AD 93-16-14.)
a. Check for oil and grease leaks.
b. Clean the spinner, propeller hub interior and exterior, and blades with a non corrosive solvent.
c. Inspect the hub parts for cracks.
d. Steel hub parts should not be permitted to rust. Use aluminum paint to touch up if necessary, or replate
during overhaul.
e. Check all visible parts for wear and safety.
f. Check the blades of the standard propeller to determine weather they turn freely on the hub pilot tube.
This can be done by rocking the counter weights back and forth through the slight freedom allowed by the
pitch change mechanism. If they appear tight and are properly lubricated, the pitch change mechanism should
be removed so that each blade can be checked individually. If blades are tight, the propeller should be
disassembled. This cannot be done with the spring propeller due to the pressure exerted by the spring even
though the dome pressure is discharged.
g. Inspect blades for damage or cracks. Nicks in leading edges of blades should be filed out and all edges
rounded, as cracks sometimes start from such places. Use fine emery cloth for finishing. Refer to Figure 8-4
for propeller blade care.
h. It is recommended that for severe damage, internal repairs and replacement of parts, the propeller
should be referred to the Hartzell Factory or Service Station.
i. Grease blade hub through zerk fittings. Remove one of the two fittings for each propeller blade,
alternate the next time. Apply grease through the zerk fitting until fresh grease appears at the fitting hole of the
removed fitting. Care should be taken to avoid blowing out hub gaskets.
8-18. INSTALLATION OF PROPELLER. (Refer to Figure 8-3.)
a. Clean propeller and engine flanges.
b. Install spinner bulkhead (5) on propeller and torque bolts to specifications given in Table VIII-I.
c. Lubricate and install "O" ring (6) in propeller shaft hole.
d. Mount propeller on engine. Screw each stud (7) into its mating flange bushing a few threads at a time
until all are tight. Torque bolts to specifications given in Table VIII-I. Safety the mounting bolts with
MS20995C41 wire, routing the wire through the lock pins.
e. Install spinner (2). Torque spinner screws (8) and check nut (4) per Table VIII-I. Safety check nut with
MS20995C41 wire.
Revised: 2/18/94
POWER PLANT
2H16