Hartzell HC-E4 3 Series Owner's Manual page 191

3 Leaks from the front of the cylinder or through
the start lock units
a
4 Leaks between the hub and the engine
a
(2) Inspection Procedure
(a) Remove the spinner dome.
CAUTION:
(b) Perform a visual inspection of the hub, blades, and
blade retention areas to locate the source of the
grease leak.
1 If the source of the grease leak is a lubrication
fitting, blade O-ring, or the hub parting line,
repairs can be accomplished during scheduled
maintenance as long as flight safety is not
compromised.
a
2 If the source of the grease leak is a component
or location other than a lubrication fitting, blade
O-ring, or the hub parting line, the propeller must
be disassembled and inspected at a certified
propeller repair station with the appropriate
rating before further flight.
INSPECTION AND CHECK
Propeller Owner's Manual
Faulty seal(s) between the piston and
cylinder, or piston and pitch change rod
(1) Refer to a certified propeller repair
station with the appropriate rating
for seal replacement.
Faulty or missing seal between the propeller
hub and the engine flange
PERFORM A VISUAL INSPECTION
WITHOUT CLEANING THE PARTS. A
TIGHT CRACK IS OFTEN EVIDENT
DUE TO TRACES OF GREASE
EMANATING FROM THE CRACK.
CLEANING CAN REMOVE SUCH
EVIDENCE AND MAKE A CRACK
VIRTUALLY IMPOSSIBLE TO SEE.
To repair a grease leak from a lubrication
fitting, blade O-ring, or hub parting line,
the propeller must be disassembled and
inspected at a certified propeller repair
station with the appropriate rating.
147
61-00-47
Rev. 17 Sep/20
Page 5-21