Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 1435 / 1956

PAGE 7
Feb 28/07 7G13
74-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
B. Installation
Before installing spark plugs, ascertain that the threads within the cylinder are clean and not
damaged.
CAUTION: MAKE CERTAIN THAT 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.
(1) Apply anti-seize compound sparingly on the threads and install the gasket and spark plugs.
Torque the plugs to 420 inch-pounds.
(2) Carefully insert the terminal insulator in the spark plug and tighten the coupling unit.
C. Inspection and Cleaning
(1) Visually inspect each spark plug for the following non-repairable defects:
(a) Severely damaged shell or shield threads nicked up, stripped or cross-threaded.
(b) Badly battered or rounded shell hexagons.
(c) Out-of-round or damaged shielding barrel.
(d) Chipped, cracked or broken ceramic insulator portions.
(e) Badly eroded electrodes worn to approximately 50 percent of original size.
(2) Clean the spark plug as required, removing carbon and foreign deposits.
(3) Set the electrode at 0.016 to 0.021 inches. (See Lycoming Service Instruction No. 1042.)
(4) Test the spark plug, both electrically and for resistance.
Removing Frozen Spark Plug
Figure 14