Lycoming IVO-540 Series, Operator'S Manual

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SECTION 6 LYCOMING OPERATOR’S MANUAL
TROUBLE-SHOOTING VO, IVO & TIVO-540 SERIES
TROUBLE PROBABLE CAUSE REMEDY
High Deck Pressure (Compressor
Discharge Pressure) (Cont.)
Density controller malfunction. Replace controller.
Low Deck Pressure (Compressor
Discharge Pressure)
Restriction in lines from actuator
to density controller, safety valve
and reservoir.
Remove and clean lines.
Density controller is in need of
adjustment.
Adjust density controller to curve.
Inlet orifice to actuator clogged. Remove inlet line at actuator and
clean orifice.
Density controller malfunction. Replace unit.
Exhaust bypass valve butterfly not
closing
1. Low pressure. Clogged orifice
in inlet to actuator.
2. Butterfly shaft binding. Check
bearings.
Turbocharger impeller binding,
frozen or rubbing housing.
Check bearings. Replace
turbocharger.
Piston seal in actuator leaking.
(Usually accompanied by oil
leakage at drain line.)
Remove and replace actuator or
disassemble and replace packing.
Exhaust Bypass Valve Butterfly
Opens when Engine is Shut Off
Exhaust bypass valve actuator
piston locked in full open
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 and operation of
piston and packing, or replace
actuator assembly.
6-6