Lycoming IO-390-D Series Maintenance Manual page 158

(3) Push the hollow end of the Tappet Assembly Tool over the hydraulic tappet plunger and
withdraw the plunger.
(4) Bend a right angle in one end of a piece of wire and insert this end into the space between
the plunger assembly and the tappet body. Turn the wire 90º to engage a coil of the spring
and draw out the hydraulic tappet plunger assembly. Refer to Figure 11.
Figure 10
Removing Push Rod Socket
(5) Remove and discard the crankshaft bearings, crankshaft front bearings, and O-rings
(Figure 12).
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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Removing Hydraulic Tappet Plunger Assembly
Figure 12
Main Bearings and O-Rings
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Figure 11
March 2020