Engine Assembly Procedure - Lycoming IO-390-D Series Maintenance Manual

Engine Assembly Procedure

A. Complete the sequence of steps in Table 2.
B. Complete the Engine Assembly Checklist in the chapter.
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.
Step
Review the "General Assembly
Step 1
Practices" in this chapter
Begin the "Crankshaft Assembly" procedure in
Chapter 72-20.
Examine the alignment dowel, and if necessary, replace
the alignment dowel.
"Crankshaft Gear Installation" procedure
Step 2
in Chapter 72-20
Install the
crankshaft
gear on the
crankshaft
(Figure 1).
"Expansion Plug Installation" procedure
Step 3
in Chapter 72-20
Install the
expansion
plug on the
crankshaft
(Figure 2).
"Solid-Ring Crankshaft Oil Seal
Step 4
Installation" procedure in Chapter 72-20
Start install-
ation of the
solid-ring
crankshaft
oil seal on
the
crankshaft
(Figure 3).
(or install
the oil seal
Solid-Ring Crankshaft Oil Seal
later on)
72-10
Page 116
Sequence of IO-390-D Series Engine Assembly Procedures
Reference
Figure 1
Crankshaft Gear
Figure 2
Expansion Plug
Figure 3
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Table 2
Step
"Connecting Rod Installation" procedure
Step 5
in Chapter 72-20
Install the
connecting
rods on the
crankshaft
(Figure 4).
"Counterweight Installation" procedure
Step 6
in Chapter 72-20
Install the
counter-
weights on
the
crankshaft
(Figure 5).
"Piston Cooling Nozzle Installation (if
Step 7
removed)" procedure in Chapter 72-20
Install the
piston
cooling
nozzle (if
removed)
(Figure 6).
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Reference
Figure 4
Connecting Rods
Figure 5
Counterweights
Figure 6
Piston Cooling Nozzles
March 2020