Overhaul Manual
O-360 and IO-360 Series Engines
Table 72-00-03.3 • Engine Will Not Start
Probable Cause Correction
No Fuel Fill with fuel
Excessive Priming Leave ignition "Off" and mixture control in "Idle
Cut-Off", open throttle and clear cylinders by
cranking a few seconds. Turn ignition switch
"On" and proceed to start.
Defective ignition wire Check with electric tester, and replace any
defective wires.
Dead battery Replace battery.
Malfunction of magneto breaker Clean points. Check internal timing of
magnetos
Lack of sufficient fuel flow Disconnect fuel line and check fuel flow
Water in fuel injector or carburetor Drain fuel injector or carburetor and fuel lines.
Internal failure Check oil screens for metal particles. If found,
complete overhaul of the engine may be
required.
Table 72-00-03.4 • Rough Idling
Probable Cause Correction
Incorrect idle mixture Adjust mixture
Leak in the induction system Tighten all connections in the induction system.
Replace any damaged parts.
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
Table 72-00-03.5 • Engine Not Able To Develop Full Power
Probable Cause Correction
Leak in the injection system Tighten all connections and replace damaged
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 proper fuel
Faulty ignition Tighten all connections. Check system with
tester. Check ignition timing.
Internal Timing Check rocker arm motion as engine is rotated
on nose stand.
2
© March 2005 Superior Air Parts Inc.
72-00-03
Testing and Fault Isolation
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