Teledyne Continental Motors, Inc.
TM
Torque
Specifications
IOF-550 Permold Series Engine Maintenance Manual
B-3
1 April 2007
WARNING
The use of sealants or lubricants other than those specified by
TCM on mating threads and between mating surfaces can
cause incorrect torque application and subsequent engine
damage or failure.
B-2.
Cylinder Torque Procedure
Proper cylinder installation requires the bolts be torqued in multiple stages. Cylinder base
stud threads, through bolt threads and nuts must be lubricated with clean 50 weight
aviation oil. Through bolt nuts at cadmium plated washers require a lower torque value to
achieve the same through-bolt pre-load since the lubricity of the cadmium plating reduces
joint friction.
Procedure
1.
Torque cylinder base nuts to ½ of the specified torque value for the fastener.
2.
Torque the cylinder through bolt nuts and cylinder base nuts to the specified value for
the cylinder base stud nuts. Through bolt nuts must be torqued on both sides of the
engine, even if only one cylinder is being installed.
WARNING
Failure to torque through bolt nuts on both sides of the engine
can result in a loss of main bearing crush with main bearing
shift and subsequent engine failure.
NOTE: Through-bolt nuts P/N 634505 and 649496 have been
superseded by P/N 652541.
Nut P/N 634505 is a flanged six-point (hex) nut requiring a torque
value of 690-710 inch-pounds. Nut P/N 649496 is a flanged six-
point (hex) nut requiring a torque value of 790-810 inch-pounds.
At engine overhaul, all P/N 634505 and P/N 649496 flanged
through bolt nuts must be replaced with 652541 flanged twelve-
point nuts. If replacing P/N 634505 and P/N 649496 with 652541
in less than a complete set prior to engine overhaul, torque the
652541 twelve-point nuts to the torque value of the original
fastener (P/N 634505 or P/N 649496).
3.
Torque through-bolt nuts on both sides of the engine to the specified torque value.
4.
For engines which incorporate the seventh cylinder deck stud, install the seventh stud
cylinder bracket and conical stud nut. Torque the stud nut to the value specified for
the fastener.
