LYCOMING OPERATOR’S MANUAL
SECTION 6
IO-320 SERIES
TROUBLE-SHOOTING
TROUBLE
PROBABLE CAUSE
REMEDY
Failure of Engine to Develop Full
Power
Leak in induction system
Tighten all connections and
replace defective parts.
Throttle lever out of adjustment
Adjust throttle lever.
Improper fuel flow
Check strainer, gage and flow at
the fuel inlet.
Restriction in air scoop
Examine air scoop and remove
restrictions.
Improper fuel
Drain and refill tank with
recommended fuel.
Faulty ignition
Tighten all connections. Check
system with tester. Check ignition
timing.
Rough Engine
Cracked engine mount
Replace or repair mount.
Defective mounting bushings
Install new mounting bushings.
Uneven compression
Check compression.
Low Oil Pressure
Insufficient oil
Fill to proper level with
recommended oil.
Air lock or dirt in relief valve
Remove and clean oil pressure
relief valve.
Leak in suction line or pressure
line
Check gasket between accessory
housing and crankcase.
Defective pressure gage
Replace.
Stoppage in oil pump intake
passage
Check line for obstruction. Clean
suction strainer.
High Oil Temperature
Insufficient air cooling
Check air inlet and outlet for
deformation or obstruction.
Insufficient oil supply
Fill to proper level with specified
oil.
6-3
Summary of Contents for AIO-320
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