SECTION 6 LYCOMING OPERATOR’S MANUAL
TROUBLE-SHOOTING O-360 AND ASSOCIATED MODELS
TROUBLE PROBABLE CAUSE REMEDY
Critical Altitude Lower Than Exhaust bypass valve sticking Clean and free action.
Specified (Cont.)
Engine Surges or Smokes Air in oil lines or actuator Bleed system.
Controller metering valve stem Replace controller.
seal leaking oil into manifold
Clogged breather Checkbreather for restrictions
to air flow.
NOTE
Smoke would be normal if engine has idled for a prolonged period.
High DeckPressure (Compressor Controller metering valve not Replace controller assembly or
Discharge Pressure) opening, aneroid bellows leaking replace aneroid bellows.
Exhaust bypass sticking closed Shut off valve in return line not
working.
Butterfly shaft binding. Check
bearings.
Replace bypass valve or correct
linkage binding.
Controller return line restricted Clean or replace line.
Oil pressure too high Checkpressure 75 to 85 psi (80
psi desired) at exhaust bypass
actuator desired.
If pressure on outlet side of
actuator is too high, have
exhaust bypass controller
adjusted.
Exhaust bypass actuator piston Remove and disassemble
locked in full closed position. actuator, checkcondition of
(Usually accompanied by oil piston and packing or replace
leakage at actuator drain line.) actuator assembly.
NOTE:Exhaust bypass normally
closed in idle and low power
condition. Should open when
actuator inlet line is disconnected.
Exhaust bypass controller Replace controller.
malfunction
6-6
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