GENERAL. (PA-28RT-201T)
DESCRIPTION AND OPERATION.
The magneto used on this engine is a completely self-contained unit featuring a rotating magnet and a two
lobe cam which operates the main breaker points. This magneto uses an impulse coupling to provide reliable
ignition at engine cranking speed. At low engine cranking speeds the impulse coupling automatically retards
the magneto until the engine is also at its retarded firing position. The spring action of the impulse coupling is
then released to spin the rotating magnet and produce the spark required to fire the engine. When the engine is
running, the impulse coupling acts as a drive coupling for the magneto.
TROUBLESHOOTING.
CHART 7401. TROUBLESHOOTING (MAGNETO)
Trouble Cause Remedy
Failure of engine to start. Defective spark plugs. Clean and adjust or replace
spark plugs.
Defective ignition wire. Check with electric tester and
replace defective wires.
Defective battery. Replace with charged battery.
Improper operation of Check points. Check internal
magneto breaker. timing of magnetos.
Failure of engine to idle Faulty ignition system. Check entire ignition system.
properly.
Low power and uneven run- Defective spark plugs. Clean and gap or replace
ning. spark plugs.
Magneto breaker points not Clean points. Check internal
working properly. timing of magnetos.
Defective ignition wire. Check wire with electric
tester. Replace defective wire.
Defective spark plug termi- Replace connectors on spark
nal connectors. plug wire.
Failure of engine to develop Faulty ignition. Tighten all connections.
full power. Check system with tester.
Check ignition timing.
Effectivity 74-02-00
PA-28RT-201T Page 74-01
December 1, 1978
3D10
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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