Lycoming TEO-540-C1A Maintenance Manual page 280

(f) Turn the threaded portion of the sleeve on the tool within a half-turn from the end of
the coil on the new 0.010 in. oversized Heli-Coil
(g) Use the Inserting Tool P/N 64594 (Figure 53) to install the new 0.010 in. oversized
Heli-Coil
coil engages with the first thread.
(h) Continue to turn the Inserting Tool P/N 64594. As the face of the sleeve on the tool is
1/16-inch away from the face of the boss, be sure to hold the Inserting Tool P/N
64594 tightly with one hand. Use your other hand to simultaneously turn the sleeve
counter-clockwise to free the left half-turn of the new insert.
(i) Slide the sleeve toward the top of the mandrel. The new 0.010 in. oversized Heli-
®
Coil insert is installed correctly at this point if the end of the insert is visible
projecting above the boss.
(j) Continue to turn the mandrel clockwise until the insert is no longer visible above the
boss.
(k) When the top of the insert is approximately a half turn from the face of the boss,
remove the Inserting Tool P/N 64594.
(l) Use the Expanding and Staking Tool P/N 64593 (Figure 54) to stake the new installed
0.010 in. oversized Heli-Coil
1 Fix the stop nut/adjusting screw on the Expanding and Staking Tool P/N 64593 to
limit expansion of the mandrel to within the thread gage.
2 Assemble the staking sleeve of the Expanding and Staking Tool P/N 64593 over
the mandrel until the sleeve meets the boss.
3 Gently tap the top of the staking sleeve with a plastic mallet to make a slight
chamfered edge around the periphery of the tapped hole.
4 Remove the adjusting screw/stop nut on the Expanding and Staking Tool P/N
64593 and remove this tool and its expanding mandrel
5 Use needle-nose pliers to break off the tang at the notch of the newly installed
0.010 in. oversized Heli-Coil
(13) Record replacement in the engine logbook of the standard sized Heli-Coil® insert with a
new oversized Heli-Coil
72-30
Page 250
®
insert into the spark plug hole on the cylinder head. Be sure that the first
®
insert securely in the spark plug hole as follows:
Expanding and Staking Tool P/N 64593
®
insert for the applicable cylinder number.
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
®
insert.
Figure 54
®
insert.
© 2018 Avco Corporation. All Rights Reserved
November 2018