Engine Disassembly - Lycoming IO-390-D Series Maintenance Manual

IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Engine disassembly begins after the oil has been drained from the engine per instructions in Chapter
12-10, and the engine is removed from the airframe (per instructions in this manual and the
applicable Airframe Maintenance Manual).
NOTICE: In this chapter the term "magneto" can refer to either the Lycoming Electronic Ignition
System (EIS) or optional, traditional magnetos, depending on the type of system
installed on the engine.
Follow the procedures for engine disassembly for the IO-390-D engine in the sequence identified in
Table 1.
Sequence of IO-390-D Series Engine Disassembly Procedures
Step
"Spark Plug Removal" procedure in
Step 1
Chapter 74-20
Remove the
spark plugs
(Figure 1).
"Ignition Harness Removal" procedure
Step 2
in Chapter 74-20
Remove the
ignition
harness and
ignition
leads
(Figure 2).
© 2020 Avco Corporation. All Rights Reserved
March 2020

72-05- ENGINE DISASSEMBLY

Reference
Figure 1
Spark Plugs
Figure 2
Ignition Harness
Table 1
Step
"EIS Removal" or "Magneto Removal"
Step 3
procedure in Chapter 74-30
Remove the
two
Lycoming
Electronic
Ignition
Modules or
magnetos
(Figure 3).
"Oil Level Gage Tube and Assembly
Step 4
Removal" procedure in Chapter 72-50
Remove the
oil level
gage
assembly
and oil level
gage tube
(Figure 4).
Reference
Figure 3
EIS/Magnetos
Figure 4
Oil Level Gage Tube
72-05
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