LYCOMING OPERATOR’S MANUAL SECTION 6
O-320 SERIES TROUBLE-SHOOTING
SECTION 6
TROUBLE-SHOOTING
Experience has proven that the best method of trouble-shooting is to decide on the various causes of a
given trouble and then to eliminate causes one by one, beginning with the most probable. The following
charts list some of the more common troubles, which may be encountered in maintaining engines; their
probable causes and remedies.
1. TROUBLE-SHOOTING – ENGINE.
TROUBLE PROBABLE CAUSE REMEDY
Failure of Engine to Start Lack of fuel Check fuel system for leaks. Fill
fuel tank. Clean dirty lines,
strainers or fuel valves.
Overpriming Leave ignition “off” and mixture
control in “Idle Cut-Off”, open
throttle and “unload” engine by
cranking for a few seconds. Turn
ignition switch on and proceed to
start in a normal manner.
Defective spark plugs Clean and adjust or replace spark
plugs.
Defective ignition wire Check with electric tester, and
replace any defective wires.
Defective battery Replace with charged battery.
Improper operation of magneto Clean points. Check internal
breaker timing of magnetos.
Lack of sufficient fuel flow Disconnect fuel line and check
fuel flow.
Water in carburetor Drain carburetor and fuel lines.
Internal failure Check oil screens for metal
particles. If found, complete
overhaul of the engine may be
indicated.
6-1
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