Piper Arrow IV Turbo Maintenance Manual page 634

INSTALLATION OF SPARK PLUGS.
Before installing spark plugs, ascertain that the threads within the cylinder are clean and not damaged.
1. Apply anti-seize compound sparingly on the threads and install gasket and spark plugs. Torque 360 to
420 inch-pounds.
Make certain the deep socket is properly seated on the spark plug
hexagon as damage to the plug could result if the wrench is
cocked to one side when pressure is applied.
2. Carefully insert the terminal insulator in the spark plug and tighten the coupling unit.
Effectivity
PA-28RT-201T
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
—CAUTION—
THIS SPACE INTENTIONALLY LEFT BLANK
3E6
74-22-03
Page 74-21
December 1, 1978