Piper Navajo Chieftain PA-31-350 Service Manual page 504

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE VIII-IV. TROUBLESHOOTING CHART (ENGINE) (cont)
Trouble
Cause
Remedy
Rough engine. (cont.)
Defective plug leads.
Check plug leads for con-
tinuity and break down.
Check distributor block for
moisture and carbon tracking.
Check contact springs in
distributor block.
Check magneto contact assem-
blies for burning or dirt,
(Main and Retard).
Check distributor timing.
Magneto check out-of-
limits.
Check magneto-to-engine
timing.
Inspect contact assemblies
for proper opening.
Check plugs and leads.
Low oil pressure.
Insufficient oil.
Fill sump with recommended
oil.
Air lock or dirt in re-
lief valve.
Leak in suction line or
pressure line.
Dirty oil strainers.
High oil temperature.
Defective pressure gauge.
Stoppage in oil pump
intake passage.
Remove and clean oil pres-
sure relief valve.
Check gasket between acces-
sory housing and crankcase.
Remove and clean oil
strainers.
See "High oil temperature"
in "Trouble" column.
Replace gauge.
Check line for obstruction.
Clean suction strainer.
Reissued: 9/23/80
POWER PLANT
2J17