Piper COMANCHE PA-24-180 Service Manual page 488

TABLE VIC-4I. TROUBLESHOOTING CHART (con)
(ENGINE-TURBOCARGED)
Clue
Fouled oil pressure
reducing valve in
turbo oil upply.
Faulty scavenger pump
or restricion in
scavenge synem.
PIPER COMANCHE SERVICE MANUAL
Trouble Remdy
Oil leaking out of
engme induction
drin. NOTE: care
should be taken
to make are oil
is from inside
engine inlet dran,
not on the outside
from some other point
on engine.
Oil sump or intake
valve guide Ieaking
into induction
rystem.
Failed Turbocharger
bearings and com-
preror seal.
Repair or replace sump
or valve guide.
Replace Turbocharger.
NOTE: The Turbo-
charger seal will
have co be in very
poor condition to
r it oil to pass
the compreror im-
peller seal.
Reroute for clear flow
or remove obsruction
from line.
Turbocharger drain
line murouted or
plugged.
Noisy Turbocharger
rotating asembly.
Damaged bearings.
Rotating unit rbbing
housing s a result
of damaged bearings
distorted housings,
dirt accumulation on
impeller, carbon
buid-up on turbine
or foreign object
damage.
Replace unit.
Replace unit. NOTE:
Allowable shaft play
L
.017 to .028 inch due
to semi-floaing bear-
ings. Allowable shaft
axial play s .004 to
.009 inch.
0
Oil leaking out of
exhaust pipes.
Badly worn or failed
turbocharger shaft
oil seal.
Replace turbocharger.
Replace valve.
Replace pump or
remove obstruction
In system.
POWER PLANT
ISSUED: B/1/72
0
2 110