Propeller Governor Drive Removal/Disassembly (Engines With Front-Mounted Propeller Governor Drives) - Lycoming IO-390-D Series Maintenance Manual

IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Propeller Governor Drive Removal/Disassembly (Engines with Front-Mounted Propeller
L.
Governor Drives)
(1) If not already done, remove the four nuts, lock washers and washers (Figure 13) from the
front-mounted propeller governor or the propeller governor drive cover. Discard the lock
washers.
(2) Remove the propeller governor or the propeller governor drive cover and governor
gasket. Discard the governor gasket.
(3) Cut and remove the safety wire/cable from the idler gear shaft plug (Figure 13).
(4) Remove the idler gear shaft plug and gasket from the crankcase (Figure 13). Discard the
gasket.
(5) Remove and discard the set screw from the propeller governor idler gear shaft. If the set
screw was peened or staked in the hole, remove any debris.
(6) Support the propeller governor idler gear shaft assembly and, at the same time remove the
idler gear shaft, gear assembly, and thrust washer. Discard the thrust washer.
NOTICE: Do not remove the dowels or bushings from the gear assembly. If any part of the
gear assembly is damaged, replace the entire gear assembly.
(7) Pull the propeller governor drive gear away from the crankcase.
© 2020 Avco Corporation. All Rights Reserved
March 2020
Figure 13
Propeller Governor Drive
72-20
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