8-8. INSTALLATION OF PROPELLER. ( Refer to Figure 8-2.)
a. Insure magneto switch is OFF.
b. Place the alternator drive belt in the groove of the starter ring gear and position the starter gear on the
flange of the crankshaft. Ascertain that the stamped "O" on the gear is aligned with the "O" on the crankshaft
flange.
c. Install the propeller spinner back plate or bulkhead on the starter ring gear.
d. Rotate crankshaft until the top center (TC) mark on the starter gear and the crankcase parting flange or the
index mark on the starter housing are aligned.
e. Install propeller by indexing number one propeller blade over "O" mark on ring gear support.
f. Place the doubler in position. Install and tighten each propeller bolt, with washer, finger tight. Use a
torque wrench for final tightening and tighten in sequence so that all bolts are pulled down evenly. ( Refer to
Table Vlll-l for specific torque requirements.)
g. Check the propeller blade track as given in Paragraph 8-9.
h. Safety the propeller mounting bolts with MS20995-C41 wire.
i. Install the spinner and torque attachment screws per Table Vlll-l., the minimum allowable gap between
prop and spinner components is .040 inch.
j. Adjust alternator drive belt as given in Checking Alternator Belt Tension Section Xl.
—NOTE—
If the propeller-engine combination feels rough on initial run-up or
flight, propeller may be rotated 180° from initial installation.
8-9. BLADE TRACK. Blade track is the ability of one blade tip to follow the other, while rotating. in almost the
same plane. Excessive difference in blade track (more than 0.062 inch) may be an indication of bent blades or
improper propeller installation. Check blade track as follows:
a. With the engine shut down and blades vertical. Secure to the aircraft a smooth board just under the tip of
the lower blade. Move the tip fore and aft through its full "blade-shake" travel, making small marks with a pencil
at each position. Then center the tip between these marks and scribe a line on the board for the full width of the
tip.
b. Carefully rotate propeller by hand to bring the opposite blade down. Center the tip and scribe a pencil line
as before and check that lines are not separated more than 0.062 inch.
c. Propellers having excess blade track should be removed and inspected for bent blades. Bent blades will
require repair and overhaul of assembly.
8-10. ENGINE.
8-11. REMOVAL OF ENGINE. (Refer to Figure 8-3.)
a. Turn off all electrical switches in the cockpit and then disconnect the battery ground wire at the battery.
b. Move the fuel selector lever in the cockpit to the OFF position.
c. Remove the engine cowlings by releasing the cowl fasteners and the attachment screws. Be certain that all
electrical leads are disconnected prior to removal of the cowl.
d. Remove the propeller per Paragraph 8-5.
e. Disconnect the starter positive and ground leads at the starter and their attachment clamps.
f. Disconnect the cabin heat and defroster tubes from the muffler.
g. Disconnect the primer line at the tee connection.
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
POWER PLANT
1J9
