LYCOMING OPERATOR’S MANUAL SECTION 5
IO-320 SERIES MAINTENANCE PROCEDURES
NOTE
At any time a cylinder is replaced, it is necessary to retorque the thru-studs on the cylinder
on the opposite side of the engine.
(a) Engines Using Hold-Down Plates – Install shims between cylinder base hold-down plates and
cylinder barrel, as directed in Figure 5-3, and tighten ½ inch hold-down nuts to 300 in.-lbs. (25
ft.-lbs.) torque, using the sequence shown in Figure 5-3.
(b) Remove shims, and using the same sequence, tighten the ½ inch cylinder base nuts to 600 in.-
lbs. (50 ft.-lbs.) torque.
NOTE
Cylinder assemblies not using hold-down plate are tightened in the same manner as above
omitting the shims.
Figure 5-3. Location of Shims Between Cylinder Barrel and
Hold-Down Plates (where applicable) and Sequence of Tightening
Cylinder Base Hold-Down Nuts
5-9
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