Starting Vibrator Checking Procedure; Removal Of Starting Vibrator; Installation Of Starting Vibrator - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
b. Carefully insert the terminal insulator in the spark plug and tighten the coupling nut.
8-83. STARTING VIBRATOR.
8-84. STARTING VIBRATOR CHECKING PROCEDURE.
a. Disconnect all spark plug leads from the left magneto at the spark plugs.
WARNING
Be sure all magneto spark plug leads are removed, thus preventing
the hazardous condition of plug firing during test.
b. Rotate engine crankshaft until number one cylinder is in its retard firing position. Using the
timing light, check to see that the retard contact assembly and both magneto main contact assemblies are
open.
c. Electrically disconnect starter solenoid or remove battery cable from starter so that the engine
will NOT crank during this test.
WARNING
It is necessary that the starter be electrically removed from the
circuit before the vibrator is put into operation to eliminate
possibility of starter being energized during the test.
d. Place the magneto switch in its "ON" position and actuate the starter switch. At the same time
observe the No. 1 cylinder spark plug lead which is fired by the left magneto circuit. A series of sparks
should be seen when holding the lead approximately .19 of an inch from engine ground.
WARNING
Grasp the spark plug lead far enough away from the connection so
as not to produce any dangerous electrical shock.
e. If the spark does not jump the gap, check the applied voltage to the starting vibrator. This voltage
should be 24 volts.
f. If voltage is correct, check the contact points of the magneto. Both sets of contact points shall be
opened.
g. Reject all units not complying with the preceding requirements or which show any visual defects.
8-85. REMOVAL OF STARTING VIBRATOR.
a. Remove the left access panel to the nose section interior
b. The starter vibrator is attached to the extreme left front side of the forward fuselage bulkhead at
station
c. Disconnect the electrical lead from the vibrator.
d. Remove the vibrator from the bulkhead by removing the attachment screws.
8-86. INSTALLATION OF STARTING VIBRATOR.
a. Position the vibrator on the bulkhead and secure with screws.
b. Connect the electrical leads to the vibrator.
c. Check operation per paragraph 8-84.
d. Install access panel.
Reissued: 9/23/80
POWER PLANT
2J9