Lycoming IVO-540 Series, Operator'S Manual

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LYCOMING OPERATOR’S MANUAL SECTION 6
VO, IVO & TIVO-540 SERIES TROUBLE-SHOOTING
2. TROUBLE-SHOOTING – TURBOCHARGER
TROUBLE PROBABLE CAUSE REMEDY
Engine Loses Power at Altitude Controller not getting enough oil
pressure to close bypass valve.
Check oil filters and external lines
for leaks or obstructions.
Chips under metering valve in
controller, holding it open.
Replace controller.
Metering jet in actuator plugged. Remove actuator and clean jet.
Actuator piston seal failed and
leaking excessively.
If there is oil leakage at actuator
drain, clean cylinder and replace
piston seal.
Exhaust leaks. Check entire exhaust system.
Insufficient turbine speed due to
excessive carbon on bearings and
shaft.
Replace turbocharger.
Engine Surges Air in oil line or actuator. Bleed system.
Actuator to bypass valve linkage
binding.
Correct cause of binding.
Engine Smokes Controller metering valve stem
seal broken causing oil to leak
into the manifold.
Replace controller.
Turbocharger Noisy Excessive radial and/or axial play. Replace turbocharger.
High Deck Pressure (Compressor
Discharge Pressure)
Controller metering valve not
opening, aneroid bellows leaking.
Replace controller assembly or
replace aneroid bellows.
Exhaust bypass valve sticking
closed.
Replace bypass valve or correct
linkage binding.
Shut off valve in return line not
working.
Butterfly shaft binding. Check
bearings.
Controller return line restricted. Clean or replace line.
Exhaust bypass valve actuator
piston locked in full closed
position. (Usually accompanied
by oil leakage at actuator drain
line.) NOTE: Exhaust bypass
valve normally closed in idle and
low power conditions. Should
open when actuator inlet line is
disconnected.
Remove and disassemble actuator,
check condition of piston and
packing or replace actuator
assembly.
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