Piper COMANCHE PA-24-180 Service Manual page 484

TABLE VIICU. TROUBLESHOOTING CHART (cont.)
(ENGINE-TURBOQIARGED)
Worn or broken piston
rnms.
Incorect installiaon
of piston rings.
External oil leakage.
Fulure of nngs to sat.
(New nirided
cylinders.)
Low gade of oil.
Failed or failing turbo-
charger beang or seals.
Faulry oil pressure
reducing valve in
turbocharger oil supply.
PIPER COMANCHE SERVICE MANUAL
I
Truble
Cau
Excesive oil con*
sumpion.
Filed or filing
bearing.
Check sump for meal
particles nd, if
found, oerhaul of
engine is indicated.
Instll new rings.
Intall new rings.
Check engine carefully
for leaking gaskes.
"0" rings or sand
holes.
Use mineral bae oil.
Climb to cruise ali-
rude at full power nd
openre a 75% cruse
power setting until oil
conumpoon stabilizes.
Replace with oil con-
forming to specifi-
catons.
Repluce or rebuild
turbocharger.
Replace valve.
Inaccurate pressure
readings.
Cold weather. High and low pressure
readings due co ex-
tremely cold weather
are not necessarily
I
malfunction. Small
and long oil Lines will
not transfer pressure
readings accurately un-
til engine is quite warm.
POWER PLANT
ISSUED: 8/18/72
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