Piper PA-28-161, Maintenance Manual

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PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 6
Nov 30/06
5D8
74-20-00
E. Installation
(1) Before installing harness on magneto,
check mating surfaces for cleanliness.
(2) Place har ness ter minal plate on
magneto and tighten nuts around plate
alternately to seat cover squarely on
magneto.
NOTE: The left magneto is wired to fire
all top spar k plugs in this
engine. The right magneto fires
all bottom plugs.
(3) Route ignition wires to their respective
cylinders.
(4) Clamp harness assembly in position
and replace engine baffle plate.
(5) Connect leads to spark plugs.
2. Spark Plugs (Refer to Figure 14.)
A. Removal
CAUTION: WHEN WITHDRAWING IGNITION CABLES LEAD CONNECTION FROM PLUG,
CAREFULLY PULL LEAD STRAIGHT OUT AND IN LINE WITH CENTER LINE OF
PLUG BARREL; OTHERWISE, A SIDE LOAD WILL BE APPLIED WHICH
FREQUENTLY RESULTS IN DAMAGE TO BARREL INSULATOR AND CONNECTOR.
A LEAD CANNOT BE REMOVED EASILY IN THIS MANNER, RESISTING CONTACT
BETWEEN NEOPRENE COLLAR AND BARREL INSULATOR WILL BE BROKEN BY
A ROTARY TWISTING OF COLLAR. AVOID UNDUE DISTORTION OF COLLAR AND
POSSIBLE SIDE LOADING OF BARREL INSULATOR.
(1) Loosen coupling nut on harness lead and remove terminal insulator from spark plug barrel
well.
CAUTION: DUE TO GREATER TORQUE VALUE REQUIREMENTS, TORQUE WRENCHES
SHOULD NOT BE USED TO REMOVE SPARK PLUG.
CAUTION: DO NOT ALLOW FOREIGN OBJECTS TO ENTER SPARK PLUG HOLE.
(2) Remove spark plug from engine.
(a) In the course of engine operation, carbon and other combustion products are deposited
on the end of spark plugs and will penetrate lower threads to some degree. As a result, a
greater torque is required for removing a plug than for installation. Torque limitations given
do not apply to plug removal, as sufficient torque must be used to unscrew plug.
(b) The higher torque required to remove plugs 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 may, if sufficiently severe, produce a failure in this location.
(3) Immediately upon removal, place spark plugs in a tray in a manner that will identify their
position in the engine.
Installation of Spring
Figure 13