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
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