Piper Navajo PA-31 Service Manual page 519

PIPER NAVAJO SERVICE MANUAL
TABLE VIII-VII. TROUBLESHOOTING
CHART (ENGINE) (cont.)
)uble
Cause
Remedy
Trouble
Cannot reach specified
critical altitude.
Dirty induction air filter.
Damaged compressor or
turbine wheel.
Replace.
Replace or overhaul turbo-
charger.
NOTE
Determine reason for damage and eliminate.
Wastegate does not go to full
closed position.
Bad bearings in turbo.
Suck-open door- on compressor
discharge housing not fully
closed or door gasket damaged
(T10-540 engines).
Faulty or improperly adjusted
controller.
Insufficient oil pressure to
close wastegate.
Damage to compressor or
turbine wheel.
Leaks in exhaust system.
Poor combustion.
Adjust for full travel. If butter-
fly is sticking, work free and
apply corrosion penetrant. If
actuator seal is leaking, dis-
assemble. clean cylinder and
replace seal.
Replace or overhaul turbo.
Adjust magnet so door closes
properly and/or replace
gasket.
Repair, replace or adjust
controller.
Adjust. Check for kinks or re-
strictions in actuator supply
line.
Replace turbocharger.
Repair or replace as required.
Do a diff. comp. check and
borescope inspection to
locate excessively leaking
valves, valve guides or rings
and to locate any broken
rings.
POWER PLANT
Added: 9/24/81
2J21