Overhaul Manual
O-360 and IO-360 Series Engines
Table 72-00-03.6 • Rough Engine Operation
Probable Cause Correction
Broken engine mount Replace or repair mount.
Mounting bushings worn Install new mounting bushings.
Unstable compression Check compression.
Table 72-00-03.7 • Low Power & Engine Runs Rough
Probable Cause Correction
Mixture too rich; indicated by sluggish engine
operation, red exhaust flame at night. Extreme
cases indicated by black smoke from exhaust
Readjustment of fuel injector or carburetor may
be required by authorized personnel.
Mixture too lean; indicated by overheating or
back firing
Check fuel lines for dirt or other restrictions.
Readjustment of fuel injector or carburetor may
be required by authorized personnel.
Leaks in induction system Tighten all connections. Replace damaged
parts.
Defective spark plugs Clean and gap or replace spark plugs.
Improper fuel Drain and refill tank with proper grade.
Magneto breaker points not working properly Clean points. Check internal timing of
magnetos.
Defective ignition wire Check wire with electric tester. Replace
defective wire.
Defective spark plug terminal connectors Replace connectors on spark plug wire.
Table 72-00-03.8 • Low Oil Pressure On Engine Gage
Probable Cause Correction
Lack of oil Add to proper level.
Air lock or dirty relief valve Clean relief valve.
Leak in line Inspect gasket between accessory housing and
crankcase.
High oil temperature See Table 72-00-03.9, “High Oil Temperature”.
Defective pressure gage. Replace defective gage.
Stoppage in oil pump intake passage Check line for obstruction. Clean suction
strainer.
3
© March 2005 Superior Air Parts Inc.
72-00-03
Testing and Fault Isolation
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