Piper Navajo PA-31 Service Manual page 566

PIPER NAVAJO SERVICE MANUAL
TABLE VIIIB-III. TROUBLESHOOTING CHART (ENGINE) (cont.)
Trouble
Cause
Remedy
Engine is hard
starting. (cont.)
Vibrator-magneto combi-
nation not "putting-
out" electrically.
Turn engine in proper di-
rection of rotation until
retard points just open
No. 1 cylinder position.
Remove input connection
from starter to prevent
engine turning and while
holding No. 1 plug lead
.19 of an inch from
ground energize vibrator
by activating the starter
switch. Plug lead should
throw a .19 of an inch
spark. If spark is weak
or missing try new vi-
brator. If this does not
correct trouble, check
magneto for improper
internal timing or im-
properly meshed distri-
butor gears.
Magneto improperly
timed to engine.
Advance contact assem-
bly out of adjustment
(internal timing off).
Retard points opening
too late.
Check magneto to engine
timing in accordance
with paragraph 8B-20.
Check magneto timing
per paragraph 8B-21.
Check timing of retard
points according to
paragraph 8B-21, g.
POWER PLANT
Reissued: 10/12/79
2L20