Piper PA-24 Comanche Service Manual page 341

PIPER
COMA~CH[
SERVICE MA!I'll:AL
• 74A-14. Installation Of Propeller. (McCaule)') (PA-24-250) (Refer to Figure 7A-I.)
CAL'TIO'
Ascertain the Master S\\ itch and Magneto Switch are in the"OFF"
poxitinn and the Mixture Control is in the "IDLE-CL'T-OFF'
position.
a. Position the spinner bulkhead ring (5) against the
starter
ring gear support (4) so that one arrow
lines up with the TC I on the front face of the support.
b. Secure the spinner bulkhead to the starter ring gear support with 12 bolts (I). 12 nuts (3). and 24
washers (2)
(one under the bolt head and one under each nut). Carefully tighten nuts uniformly to torque
limits shown in Table \'IIA·1.
c. Clean the propeller and engine flanges.
d. Observe the starter ring gear to make sure it is mounted properly on the engine crankshaft flange.
The crankshaft flange
is
stamped with "0" mark and the starter ring gear is likewise identified by
an
"0"
mark. L'pon installation of the starter ring gear. the markings shall be mated to insure proper installation.
e. Insert the "0" ring in the groove of the prope\1er (7) hub bore. Make sure that the "0" ring is not
twisted and is liberally coated with clean lubricating oil.
~OTE
•
Some \1cCauley Model 2036CI4 propellers will be found in use
with a
counterbore
in the hub instead of an
"0"
ring groove. When
installing these propellers. always insert the
"0"
ring in the
counterbore and push it to the bottom. Never slide the "0" ring on
the crankshaft pilot.
f.
Raise the propeller and line up the arrows on the hub flange outer diameter with the short bushing
in the crankshaft flange. Engage the pilot in the hub. making sure that face of hub flange is parallel with the
face of the crankshaft flange. then push the propeller in. Make sure that the bolt holes engage the bushings.
CACTIO'
It is important that the propeller be seated against the crankshaft
flange with a straight push. Rotating or cocking it on will cause
damage to the
"0"
ring and oil leakage will result. Particular care
must be taken while installing hubs having a counterbore to prevent
damaging the
"0"
ring or displacing it so that it is lodged between
the flange faces. The latter condition will be indicated by non-
tracking of the blades immediately after installation.
g. Slide washers
(9)
on bolts
(8)
and tighten bolts uniformly all around to the torque limits of Table
'\'IIA~I
and safety wire bolts.
h. Check blade track. (Refer to paragraph 7A-22.)
i.
Slide spinner (10) over the propeller. align screw holes with the nuts in the bulkhead. and install
washers (12) and screws (\
I).
Tighten
to
the torque given in Table VilA-I.
•
ISSt-ED: 8/18/72
2C9
POWER PLA'T