Technical data

13773-001
71-00
Page 730 Nov 2000
Engine Runs Rough At Speeds
Above Idle
Improper Fuel/Air mixture. Check fuel manifold connections
for leaks. Torque loose connec-
tions. Check fuel control/metering
unit and linkage for setting and
adjustment in accordance with IO-
550 Maintenance Manual Chapter
22, “Fuel System Adjustment.”
(Refer to Model IO-550 Mainte-
nance Manual) Check fuel filters
and screens for debris. Check for
proper fuel pump pressure.
Restricted fuel nozzle jet. Clean. Replace nozzle if obstruc-
tion cannot be cleared by solvent
action.
Ignition system and spark plugs
malfunctioning.
Clean, regap and test spark plugs.
Inspect, test and repair ignition
system. Replace components as
required. (Refer to 74-00)
Engine Lacks Power, Reduction in
Maximum Manifold Pressure
Incorrectly adjusted throttle control
linkage or dirty air filter.
Check movement of linkage by
moving control from idle to full
throttle. Replace worn compo-
nents.(Refer to 76-00]
Service air filter in accordance
with the airplane manufactures
instructions. (Refer to 71-60]
Low Oil Pressure Indication On
Engine Gage
Low oil supply. Oil viscosity too
low.
Replenish. Drain and refill with
correct viscosity. Adjust oil pres-
sure in accordance with IO-550
Maintenance Manual Chapter 22,
“Oil Pressure Adjustment.” (Refer
to Model IO-550 Maintenance
Manual)
Malfunctioning oil pump. Repair or replace oil pump.
Weak or broken oil pressure relief
valve spring.
Replace spring.
High Oil Temperature Indication Prolonged ground operation. Limit ground operation to a mini-
mum.
Malfunctioning gage or bulb unit. Check wiring. Check bulb unit.
Check gage.
TROUBLE PROBABLE CAUSE REMEDY