Piper Navajo PA-31 Service Manual page 518

PIPER NAVAJO SERVICE MANUAL
TABLE VIII-II. TROUBLESHOOTING CHART (ENGINE) (cont.)
Trouble
Cause
Remedy
Engine surges. (cont.)
Plugged breather.
Remove any obstructions.
Defective oil pump.
Prop blades sticking in hub
intermittently.
Carburetor too rich.
Repair or replace.
Remove and overhaul prop.
Repair or replace.
ALSO SEE TURBOCHARGER
TROUBLESHOOTING CHART.
Loss of power going to
altitude.
Leak in turbo system.
Check all clamps and bolts on
induction and exhaust system.
NOTE
Insure that alternate air door closes completely and suck-open door
is properly adjusted and gasket is not damaged.
Density controller does not
follow course to altitude.
Oil line to actuator inlet
kinked or blocked.
Differential controller poppet
valve leaking.
Poor combustion.
Binding turbo.
Lean injector.
Differentail pressure controller
lines hooked up improperly.
Replace controller.
Remove, clean or replace line.
Replace differential controller.
Perform differential pressure
check and borescope inspec-
tion to locate excessively
leaking valves, valve guides or
rings and to locate any broken
rings.
Overhaul or replace.
Replace, recalibrate or over-
haul injector.
Attach controller sensing lines
to proper locations.
POWER PLANT
Added: 9/24/81
2J20