IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
72-05
March 2020
Page 109
IO-390-D Series Engine Maintenance Manual
Table 1 (Cont.)
Sequence of Engine Disassembly Procedures
Step
Reference
Step
Reference
Step 11
Remove the
oil cooler
bypass
valve,
oil filter,
and oil filter
base
(Figure 11).
Procedures in Chapters 12-10 and 72-
50
Step 14
Remove the
oil pump
and the fuel
pump
plunger
(Figure 14).
“Oil Pump Removal” and “Fuel Pump
Plunger Removal” procedures in
Chapter 72-25
Figure 14
Oil Pump
Figure 11
Oil Cooler Bypass Valve,
Oil Filter, and Oil Filter Base
Step 12
Remove the
propeller
governor oil
line (Engine
with rear-
mounted
propeller
governor)
(Figure 12).
“Propeller Governor Oil Line
Removal” procedure in Chapter 72-50
Step 15
Remove
both
crankshaft
idler gears
(Figure 15).
“Crankshaft Idler Gear and Bushing
Removal” procedure in Chapter 72-20
Figure 15
Crankshaft Idler Gears
Figure 12
Propeller Governor Oil Line
Step 13
Remove any
airframe
components
from the
accessory
housing and
remove the
accessory
housing.
Remove the
propeller
governor
(Figure 13).
“Accessory Housing Removal” in
Chapter 72-25
Remove the propeller governor per
airframe manufacturer’s instructions
Figure 13
Accessory Housing
Step 16
Remove the
oil drain
tubes from
the engine
cylinder
heads and
crankcase
(Figure 16).
“Oil Drain Tube Removal” procedure
in Chapter 72-30
Figure 16
Oil Drain Tubes
