Piper COMANCHE PA-24-180 Service Manual page 486

PIPER COMANCHE SERVICE MANUAL
TABLE VIC-UI. TROUBLESHOOTING CHART (cont)
(ENGINE-TURBOCHARGED)
Trouble Cause
I
Loss or reduction of
fuel presre when
curbocharging. (cont.)
Ruptured boost pres-
sure reference line
to fuel pressure
regulating valve.
Remedy
Continue operation until
next landing if engine -
is smooth; otherwse,
reduce power to obtain
smooch engine operation.
Ground check fuel
system.
Engine runs hot (5003
or more) when turbo-
charging or naturally
asprated.
May be due to extreme
hot weat
Cracked or loose cyl-
inder cooling ir
baffles.
Dunng climb.
Over-boost or RPM
too high.
Fuel mixture too lean
during very hot
weather
Mis-timed ignition.
either reclrded or
pre-lgniion.
Detonation due to too
low octane fuel or
Irem ibove.
Faulty cylinder head
temperature gauge.
Defective oil cooling
system.
Combinations of above
Reduce power or open
cowl flaps.
Repair or replace as
required.
Reduce power or open
cowl flaps or increase
Indicated Au Speed
Reduce MAP or RPM
Ennchen mixture.
Check igninon tuning.
adjust as necessary
Fuel mixture set too
lean or fuel octane too
low. Check mixture
and fuel grade
Replace Instrumen
Inspect and repair as
required.
Svstemautcally elimi-
nare by above steps.
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POWER PLANT
ISSUED: 8/18/72
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