Engine Timing Marks - Piper Navajo PA-31 Service Manual

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PIPER NAVAJO SERVICE MANUAL
b. Continue turning the crankshaft until the 20
°
advance timing mark is in align-
ment with the small hole located on the top face of the starter housing at the two
o'clock position. (Refer to Figure 8-15.)
c. Remove the inspection plug on the left magneto and turn the drive coupling
in direction of normal rotation until the first painted chamfered tooth is aligned
in the center of the inspection hole. (Refer to Figure 8-16.) Without allowing the
gear to turn from this position, assemble gasket and magneto to the engine. Se-
RED OR
WHITE TOOTH
229
Figure 8-15. Engine Timing Marks
Figure 8-16. Magneto Timing Marks
cure in place with washers and nuts; tighten only finger tight.
d. Fasten ground wire of electric timing light to any unpainted portion of the
engine, and one of the positive wires of the timing light to a suitable terminal con -
nected to the ground terminal of the magneto. Then turn the engine crankshaft
several degrees from the advance timing mark in direction opposite to that of
normal rotation.
e. Turn on the switch of the timing light, which should be lit. Turn the crank-
shaft slowly in direction of normal rotation until the mark on the starter gear
aligns with the hole in the starter housing, at which point the light should go out.
If not, turn the magneto in its mounting flange and repeat the procedure until the
light goes out. Repeat the same procedures with the right magneto.
NOTE
Battery powered timing lights operate in the reverse
manner from that described above; the light goes on
when the marks align.
Reissued: 10/12/79 POWER PLANT
2J1