Piper Navajo Chieftain PA-31-350 Service Manual page 508

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE VIII-IV. TROUBLESHOOTING CHART (TURBOCHARGER) (cont)
Trouble Cause
Remedy
Critical altitude lower
than specified. (cont.)
Actuator piston seal
failed and leaking ex-
cessively.
If there is oil leakage at
actuator drain, clean cyl-
inder and replace piston
seal.
Waste gate valve
sticking.
Clean and free action.
Engine surges or smokes. Air in oil lines or
actuator.
Bleed system.
Controller metering valve
stem seal leaking oil
into manifold.
Actuator to waste gate
linkage binding.
Clogged breather.
Bootstrapping.
Replace controller.
Correct cause of binding.
Check breather for re-
strictions to air flow.
Operate engine within range
outlined in operation manual.
NOTE
Smoke would be normal if engine has idled for a prolonged period.
High deck pressure. (Com-
pressor discharge pres-
sure.)
Controller metering valve
not opening. Aneroid
bellows leaking.
Replace controller assembly
or replace aneroid bellows.
Waste gate sticking
closed.
Shut-off valve in return
line not working.
Butterfly shaft binding.
Check bearings.
Replace bypass valve or
correct linkage binding.
Reissued: 9/23/80
POWER PLANT
2J21