Piper COMANCHE PA-24-180 Service Manual page 434

Flow meter reds high.
Failure of engine to
develop full power.
PIPER COMANCHE SERVICE MANUAL
TABLE VB41-U. TROUBLESHOOTING CHART
(ENGiNE) (coot)
Trouble
Cuse
0
Remedy
Low power and uneven
running. (cont.)
Leak in umnifold line.
Leak in induction sysem.
Poor fuel.
Magneto breaker points
not working properly.
Defective inition wie.
Improper ignition timing.
Defective spark plug
ertninal connectors.
Incorrect valve cleaance.
Tighten firngp.
Tighten all connecions.
Replace defective pats.
Fill tank with fuel of
recommended grade.
Clean point. Check internl
riming of magnetos.
Check wire with elecric
tester. Replace defective
wire.
Check magnetos for timninf
and synchronizaion.
Replace connecors on spark
plug wire.
Adjust valve clearnce by
changing push rods.
Clogged nozzle.
Throttle lever nut out of
adjustment.
Leak in induction system.
Mixture too lean.
Throttle linkage limiting
ravel of throttle valve.
Restrictions in inlet air
scoop.
Improper fuel.
Faulty ignition.
Remove and flush with acetone.
Blow through orifice with
compressed air - 100 psi.
Adjus throttle lever.
Tighten intake pipe mounnng
flange nuts and tighten
intake manifold.
Injector must be recalibred.
Check throttle linkage and
throttle valve opening.
Examine air scoop and
remove resrmctons.
Fill tank with recommended
aviation fuel.
Tighten all connections.
Check system with tester.
Check ignition tuming.
Rough engine.
Cracked engine mount.
Unbalanced propeller.
Defective mounting
bushings.
Replace mount.
Remove propeller and have
it checked for balance.
Install new mounting
bushings.
POWER PLANT
ISSUED: 8/18/72
2 64