Piper Navajo Chieftain PA-31-350 Service Manual page 500

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE VIII-IV. TROUBLESHOOTING CHART (ENGINE) (cont)
Trouble Cause
Remedy
Engine is hard starting.
Low voltage or defective
vibrator.
Measure voltage between vi-
brator terminal marked "IN"
and the ground terminal
while operating starter.
There must be at least 13
volts.
Inoperative or defective
vibrator.
Retard contact assembly in
magneto not operating
electrically. Engine may
kick back during cranking
due to advance timing of
ignition.
If voltage is adequate,
listen for buzzing of vi-
brator during starter. If
no buzzing is heard, either
the vibrator is defective or
the circuit from the "Out-
put" terminal on the vi-
brator to the retard contact
assembly is open. Check both
"Switch and Retard" cir-
cuits. Also check for good
electrical ground.
Retard points may not be
closing due to wrong adjust-
ment, or may not be elec-
trically connected in cir-
cuit due to a poor con-
nection. Inspect retard
points to see if they close.
Check for proper contact
at the "Switch" and "Re-
tard" leads at magneto and
at the vibrator. Check
wiring.
Reissued: 9/23/80 POWER PLANT
2J13