Lycoming IO-320-A1A Operator's Manual page 55

SECTION 5
MAINTENANCE PROCEDURES
e. Assembly of Hydraulic Tappet Plunger Assemblies –
f. Assembly of Valves in Cylinder –
When installing valve springs, place the dampened end of spring (close wound coils marked
with dye or lacquer) toward the cylinder.
d. Assembly of Cylinder and Related Parts –
Before installing cylinder hold-down nuts, lubricate crankcase thru-stud threads with any
one of the following lubricants, or combination of lubricants.
1. 90% SAE 50W engine oil and 10% STP.
2. Parker Thread Lube.
3. 60% SAE 30W engine oil and 40% Parker Thread Lube.
LYCOMING OPERATOR'S MANUAL
NOTE
NOTE
IO-320 SERIES