Standard Practices
Teledyne Continental Motors, Inc.
TM
C-14
IOF-550 Permold Series Engine Maintenance Manual
1 April 2007
WARNING
Helical coils can only be installed where authorized.
4.
A helical coil insert can be used on a cylinder rocker shaft retaining stud provided
that a minimum wall thickness of more than half of the helicoil diameter remains after
tapping for the helical coil insert. Refer to Figure C-7.
5.
If the hole is blind or if the hole goes through to a cavity subject to leakage, coat the
new stud’s course thread with High Strength Adhesive (TCM part number 646941).
6.
Drive the new stud with a tee handle stud driver. Turn it slowly and compare the
torque values listed in Appendix B.
7.
Drive the stud in until it reaches the desired length specified in Appendix D of the IO-
550 Permold Series Engine Overhaul Manual.
Figure C-7.
Minimum material thickness for Helical Coil insertion