IO-390-D Series Engine Maintenance Manual
72-20
© 2020 Avco Corporation. All Rights Reserved
Page 134
March 2020
IO-390-D Series Engine Maintenance Manual
M.
Oil Plug Removal
Remove the threaded NPT plugs from the accessory housing, oil sump, and crankcase to
facilitate cleaning (Figures 14, 15, and 16).
Figure 14
Oil Plugs in the Accessory Housing
Figure 15
Oil Plugs in the Oil Sump
Figure 16
Oil Plugs in the Crankcase
N.
Crankshaft Idler Gear Shaft Removal
(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).
Figure 17
Safety Wire on the
Idler Gear Shaft
Figure 18
Crankshaft Idler Gear Shafts
