Oil Plug Removal; Crankshaft Idler Gear Shaft Removal - Lycoming IO-390-D Series Maintenance Manual

Oil Plug Removal

M.
Remove the threaded NPT plugs from the accessory housing, oil sump, and crankcase to
facilitate cleaning (Figures 14, 15, and 16).
Oil Plugs in the Accessory Housing

Crankshaft Idler Gear Shaft Removal

N.
(1) Remove the safety wire
(Figure 17) from the nut and
three bolts that attach the
crankshaft idler gear shafts to
the crankcase halves.
(2) Remove the nut and three
bolts (Figure 18) that attach
the crankshaft idler gear
shafts to the crankcase
halves.
(3) Remove the two idler gear
shafts from the rear of the
crankcase halves (Figure 18).
72-20
Page 134
Figure 14
Figure 16
Oil Plugs in the Crankcase
Safety Wire on the
Idler Gear Shaft
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Figure 15
Oil Plugs in the Oil Sump
Figure 17
Crankshaft Idler Gear Shafts
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Figure 18
March 2020