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

Page: 1434 / 1956

PAGE 6
Feb 28/07
7G12
74-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(14) On the magneto end of the wire, place
M-3168 Insulator Sleeve over the
silicone insulation. On the spark plug
end of the wire, use K-3300 Insulator
Sleeve Assy (refer to Figure 12).
(15) Turn M-1455 Spring clockwise on the
electrode screw three full turns until the
end is flush with the first large coil of the
spring. This applies to both ends of the
wire (refer to Figure 13).
2. Spark Plugs
A. Removal
(1) Loosen the coupling nut on the harness lead and remove the terminal insulator from the spark
plug barrel well. A crows foot adapter is needed to remove the lower spark plugs and special
spark plug wrench P/N 8160 for upper plug blocked by the intercoolers (see Note).
NOTE: The special spark plug wrench P/N 8160 can be obtained from:
Borroughs Tool and Equipment Corp.
2429 North Burdick St.
Kalamazoo, Ml 49007-1897
NOTE: When withdrawing the ignition cable lead connection from the plug, care must be
taken to pull the lead straight out and in line with the center line of the plug barrel;
otherwise, a side load will be applied which frequently results in damage to the barrel
insulator and connector. If the lead cannot be removed easily in this manner, the
resisting contact between the neoprene collar and the barrel insulator will be broken
by a rotary twisting of the collar. Avoid undue distortion of the collar and possible side
loading of the barrel insulator.
NOTE: Do not use a torque wrench to remove spark plugs.
(2) Remove the spark plug from the engine. In the course of engine operation, carbon and other
combustion products will be deposited on the end of the spark plug and will penetrate the
lower threads to some degree. As a result, greater torque is frequently required for removing a
plug than for installing it. Accordingly, the torque limitations given do not apply to plug removal,
and sufficient torque must be used to unscrew the plug. The higher torque in removal is not as
detrimental as in installation, since it cannot stretch the threaded section. It does, however,
impose a shearing load on this section and, if sufficiently severe, could produce a failure in this
location.
(3) As soon as they are removed, place spark plugs in a tray that will identify their position in the
engine.
NOTE: Spark plugs should not be used if they have been dropped.
(4) Removal of seized spark plugs in the cylinder may be accomplished by application of carbon
dioxide by a conical metal funnel adapter with a hole at the apex just large enough to
accommodate the funnel of a CO2 bottle (refer to Figure 14). When a seized spark plug cannot
be removed by normal means, the funnel adapter is placed over and around the spark plug.
Place the funnel of the CO2 bottle inside the funnel adapter and release the carbon dioxide to
chill and contract the spark plug. Break the spark plug loose with a wrench. A warm cylinder
head at the time the carbon dioxide is applied will aid in the removal of an excessively seized
plug.
(5) Do not allow foreign objects to enter the spark plug hole.
Installation of Spring
Figure 13