SECTION 6 LYCOMING OPERATOR’S MANUAL
TROUBLE-SHOOTING O-320 SERIES
TROUBLE PROBABLE CAUSE REMEDY
Failure of Engine to Idle Incorrect idle mixture Adjust mixture.
Properly
Leak in induction system Tighten all connections in the
induction system. Replace any
parts that are defective.
Incorrect idle adjustment Adjust throttle stop to obtain
correct idle.
Uneven cylinder compression Check condition of piston rings
and valve seats.
Faulty ignition system Check entire ignition system.
Insufficient fuel pressure Adjust fuel pressure.
Low Power and Uneven Mixture too rich indicated by Readjustment of carburetor by
Running sluggish operation, red exhaust authorized personnel is indicated.
flame at night. Extreme cases
indicated by black smoke from
exhaust.
Mixture too lean; indicated by Check fuel lines for dirt or other
overheating or backfiring restrictions. Readjustment of
carburetor by authorized person-
nel is indicated.
Leaks in induction system Tighten all connections. Replace
defective parts.
Defective spark plugs Clean and gap or replace spark
plugs.
Improper fuel Fill tank with fuel of recom-
mended grade.
Magneto breaker points not Clean points. Check internal
working properly timing of magnetos.
Defective ignition wire Check wire with electric tester.
Replace defective wire.
Defective spark plug terminal Replace connectors on spark plug
connectors wire.
6-2
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