Piper Navajo PA-31 Service Manual page 524

PIPER NAVAJO SERVICE MANUAL
TABLE VIII-II. TROUBLESHOOTING CHART (TURBOCHARGER) (cont.)
Trouble Cause
Remedy
Engine will not deliver rated
power. (cont.)
Wastegate butterfly not
closing.
Turbocharger impeller binding,
frozen or fouling housing.
Piston seal in actuator leaking.
(Usually accompanied by oil
leakage at drain line.)
I
Critical altitude lower than
specified.
Controller not getting enough
oil pressure to close the
wastegate.
Low pressure. Clogged orifice
in inlet to actuator.
Butterfly shaft binding.
Check bearings.
Check bearings. Replace
turbocharger.
Remove and replace actuator
or disassemble, clean cylinder
and replace packing.
Check pump outlet pressure,
oil filters and external lines
for leaks or obstructions.
Replace controller.
Remove actuator and clean
jet.
If there is oil leakage at
actuator drain, clean cylinder
and replace piston seal.
Clean and free action.
Bleed system.
Chips under metering valve in
controller holding it open.
Metering jet in actuator
plugged.
Actuator piston seal failed
and leaking excessively.
Wastegate valve sticking.
Engine surges or smokes.
Air in oil lines or actuator.
Controller metering valve
stem seal leaking oil
into manifold.
Actuator to wastegate linkage
binding.
Injector nozzle pressure refer-
ence system leaking.
Clogged breather.
Replace controller.
Correct cause of binding.
Repair leak.
Check breather for restric-
tions to air flow.
Revised: 9/24/81
POWER PLANT
2K2