Piper Comanche PA-24 Service Manual page 556

PIPER COMANCHE SERVICE MANUAL
TABLE VIIB-II TROUBLESHOOTl1l;G CHART (El'GI1I;E)
Trouble
Failure of engine to
start
ISSUED: 8/18/72
Cause
Lack of fuel.
Underpriming
0,
erprimi ng
Incorrect throttle setting
Defecti,e 'park plugs.
Defecti,e battery.
Improper operation of
magneto breaker points
Air bubbles in fuel system
Fuel pump failure
Fuel line restricted
Lack of sufficient fuel
pressure
Internal failure
Clogged injector nozzles
Defecti,e ignition wire.
2G2
Remedy
Check fuel system for leak,
Fill fuel tank. Clean
dirty
lines. strainer or
fuel cocks
Prime by hold ing boost pump
switch 4 to 10 seconds
Place control in "idle-cut-
off" Open throttle and
unload engine by turning
over with starter
Open throttle to I 8 of its
range.
Clean and adjust or replace
spark plug or plugs
Replace with charged
battery
Clean points Check intanal
timing of magnetos
Check fuel vent
Replace pump
Check inlet line
Check fuel strainer and fuel
adjustments
Check oil sump strainer for
metal panicles. If found.
complete overhaul of the
engine may be required
Remo\e from cylinders. clean
in acetone solvent. blo"
through the inlector noule
opposite direction of fuel
flow with compressed air.
100 psi.
Check with electric tester.
and replace any defect"e
wires.
POWER PLAe