IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
72-05
March 2020
Page 111
IO-390-D Series Engine Maintenance Manual
Table 1 (Cont.)
Sequence of Engine Disassembly Procedures
Step
Reference
Step
Reference
Step 23
Separate the
crankcase
halves
(Figure 23).
“Crankcase Disassembly” procedure in
Chapter 72-20
Step 26
Remove the
oil plugs
(Figure 26).
“Oil Plug Removal” procedure in
Chapter 72-20
Figure 28
Oil Plugs
Figure 22
Crankcase Halves
Step 27
Remove the
crankshaft
idler gear
shafts
(Figure 27).
“Crankshaft Idler Gear Shaft Removal”
procedure in Chapter 72-20
Step 24
Remove the
tappets,
main
bearings,
and O-rings
(Figure 24).
“Tappet, Main Bearing and O-Ring
Removal” in Chapter 72-20
Figure 23
Tappets, Main Bearings and O-Rings
Figure 26
Crankshaft Idler Gear Shafts
Step 30
Remove the
piston
cooling
nozzles
(Figure 30).
“Piston Cooling Nozzle Removal” in
Chapter 72-20
Step 25
Remove the
propeller
governor
drive
(Figure 25).
“Propeller Governor Drive
Removal/Disassembly” in Chapter 72-
20
Figure 24
Propeller Governor Drive
Figure 30
Piston Cooling Nozzles
Step 28
Disassembl
e the
crankshaft
(Figure 28).
“Crankshaft Disassembly” in Chapter
72-20
Figure 28
Crankshaft Disassembled
