Removal Of Pulse Generator; Installation And Adjustment Of Pulse Generator - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
NOTE
If this point is missed, do not turn the engine backward, start over.
c.
Turn the strobe sensor case clockwise to align the timing mark with the center of the keyway.
This is the phase position. The use of an inspection mirror will be required to view the end of the unit.
d. Tighten the 1 inch hex nut.
e.
Pull the prop through (in the direction of rotation) two complete revolutions and stop at the
phase position. Check timing mark alignment. Reset if necessary.
f.
Connect electrical plug connector to the strobe sensor and install the access panel on top of the
nacelle.
14-141. REMOVALOFPULSEGENERATOR. (RefertofollowingNOTE). Thisunitislocatedintheleft
engine nacelle, aft of the fire wall, at the upper left hand corner in the area between the nacelle skin and the
outboard nacelle bulkhead. (Refer to Figure 14-47.)
a.
Remove the access panel on the outboard side of the nacelle, just above the wing leading edge.
b. Disconnect the electrical connector.
c. Loosen the I inch hex nut. at the front of the pulse generator, that connects it to the dual tach drive and
remove the generator.
NOTE
On S N 31-7852038 and up, a second pulse generator is used in lieu
of a strobe sensor in the right engine nacelle and it is removed as is
described for the strobe sensor in paragraph 14-139.
14-142. INSTALLATION
AND ADJUSTMENT OF PULSE GENERATOR. (Refer to Figure 14-49.)
a. Attach the pulse generator to the dual tach drive by securing loosely with hex nut.
NOTE
The front of the pulse generator can be defined by the square hole
in the center of the unit to accept the square end of a tach shaft.
CAUTION
Before proceeding further, be certain the magneto switches are
OFF.
b. Turn the engine in the direction of rotation to locate No. I piston at T.D.C. on the ignition
stroke. Use the engine timing mark.
NOTE
If this point is missed, do not turn the engine backward, start over.
c. Turn the pulse generator case counterclockwise (viewed from the rear) to align the timing mark
with the center of the keyway. This is the phase position. The use of an inspection mirror will be required
to view the end of the unit.
d.
Tighten the I inch hex nut.
e. Pull the prop through (in the direction of rotation) two complete revolutions and stop at the
phase position. Check timing mark alignment. Reset if necessary.
Reissued: 9/23/80 4J13 ACCESSORIES AND UTILITIES
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