Piper Comanche PA-24 Service Manual page 417

PIPER COMANCHE SERVICE MANUAL
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Exaggerated view of nicks in
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Exaggerated view of nick
leading edge
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in face of blade.
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Recommended method for re-
SeCTION AA-
moving nicks by riffle file and
Nick in face of blade removed
aocus cloth Blend
deepest
portIOn
by file and crocus cloth as
of nick
Into
leading edge align-
ment with smooth CUNes
recommended
FIGURE 7-2. TYPICAL NICKS AND REMOVAL METHOD
7-10. Cleaning, Inspection And Repair Of Propeller.
a. Check for oil and grease leaks.
b. Clean the spinner. propeller hub interior and exterior. and blades with a noncorrosive solvent.
c. Inspect the hub parts for cracks.
d. Steel hub parts should not be pennilled to rust. Use aluminum paint to toueh up if necessary. or
rep late during overhaul.
e. Check all visible parts for wear and safety.
f.
Check blades to determine whether they tum freely on the hub pivot tube. This can be done by
rocking the blades back and forth through the slight freedom allowed by the pitch change mechanism. If
they appear tight and are properly lubricated, the propeller should be disassembled by an authorized service
center.
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 7-2 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 manufacturer or Certified Repair Station.
i. Grease blade hub through zerk fillings (Hartzell propeller only). Remove one of
t~e
tWO
fillings
for each propeller blade. alternate the next time. Apply grease through the zerk filling until fresh grease
appears at the filling hole of the removed filling. Care should be taken to avoid blowing out hub gaskets.
ISSUED: 8/18/72
2A15
POWER PLANT