Piper COMANCHE PA-24-180 Service Manual page 306

PIPER COMANCHE SERVICE MANUAL
7-15. 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 0625 inch - may be an indication of bent
blade or improper propeller installation. Check blade track as follows:
a. With the engine shut down and blades vertical. ecure to the aircraft a smooh board just under the
trip of the lower blade. Move the tip fore and aft through it 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 up.
b. Carefully rotate propeller by hand to bring the opposite blade down. Center the tip and scribe a
pencil line a before and check that lines are not separated more thn .0625 inch.
c.
Propellers having excess blade track should be removed and inspected for bent blades or for parts
of sheared "0" ring, or foreign particles. which have lodged between hub and crankshaft mounting faces.
Bent blades will require repair and overhaul of assembly.
7-16. Propeller Governor.
7-17. Removal Of Governor.
a.
Life both engine cowl side panels by loosening the six fsceners.
b. Disconnect control cable from governor control arm.
c.
Remove control cable from cable bracket by removing nuts, washers, screws and clamp.
d. Remove the governor mounting stud nus. It will be necessary to raise the governor as the nuts are
being removed before the nuts can be completely removed.
e.
Remove the mounting gasket If the governor is to be removed for a considerable length of time
and another unit is not substituted, it is advisable to cover the mounting pad to prevent damage caused by
foreign matter.
7-18. Installation Of Governor.
a.
Clean the mounting pad thoroughly making very certain that there are no foreign particles in the
recess around the drive shaft.
b. Place the governor mounting gasket in position with the raised portion of the screen facing away
from the engine.
c.
Install the control cable bracket on the governor.
d. Align the splines on the governor shaft with the engine drive and slide the governor into position.
e. Raise governor off mounting pad enough to install washers and start mounting nuts. Torque nuts
evenly.
f. Connect the control cable end to the governor control arm.
g. Secure control cable to cable bracket.
h. Adjust governor control per paragph 7-19
POWER PLANT
ISSUED: 8/18/72
2 A20