BEECH
CRAFT
Duchess 76
MAGNETOS
section
VIII
Handling,
serv
and
Maint
CAUTION
Before installing a new magneto, it is vitally im-
portant to check the identification plate for the
proper part number to ensure the correct mag-
neto is installed on the proper engine. The mag-
netos are not interchangeable between left and
right engines.
The magneto ignition system should be checked after the
first
50
hours of operation and every 100 hours thereafter.
Contact point clearance for the magneto right main breaker is
.016
± .004, left main breaker is .016 ± .002. Points with
deep
pits or
with
excessively
burned
areas should
be
discarded. Inspect the cam
follower
felt
pad
for
proper
lubrication and clean the breaker compartment with a clean
dry cloth.
WARNING
To
be
safe, treat all magnetos as hot whenever
the ground lead
is
disconnected. To ground the
magneto, disconnect the ignition switch lead wire
at
the capacitor and ground the capacitor pole. If
this is impractical, remove the ignition harness
on
the magneto or disconnect the spark plug
leads.
January 1978
8-25
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