IO-390-D Series Engine Maintenance Manual
72-20
© 2020 Avco Corporation. All Rights Reserved
Page 132
March 2020
IO-390-D Series Engine Maintenance Manual
(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
Figure 11
Removing Hydraulic Tappet Plunger Assembly
(5)
Remove and discard the crankshaft bearings, crankshaft front bearings, and O-rings
(Figure 12).
Figure 12
Main Bearings and O-Rings
