PIPER
COMANCHE
SERVICE
MANUAL
J.
Tum
the cnnksh&ft very slowly in direction
of
normal rotation until the riming mark
on
the front
face
of the
liIIs
gear
~
with the drilled bole
in
the
starter
or
the
timinJ
mark on the back
of
the ring
gear dilDs with the crankcase parting surfaces.
At
this point the !isht sbollld
,0
out.
k.
If the lisht does not
go
out
at
this
point. align timmg marks and rotate magnetO
on
mounting
t1an,.
in
the desired direCtIon and repeat the procedure
una!
the !isht goes
OUt
at
.25
degrees before
tOP
dead center.
CAUTION
When timing
rewd
breaker
magnetos
to
the
engine, only main breaker
points are timed. Never artempt
to
rime retard breaker points
to
the
engine.
l.
Tichten the two
mounnr
'un
and replace the inspection plug.
m.
After tia:htening macnetc.
.nountint
nuu.
check timlng
to
mak.e
sure
it
is
still
correa.
n.
Install
the
other
magnetO
and rime using the preoeding instructions A
throulh
M.
o. With
both
magnetos tUned
to
the engine and seoured, check
that
they fire together.
Route
the
c:ranksh&ft
opposite normal
rotanon
to approximately
3S
degrees BTC with No. 1 cylinder on the
compression stroke.
p.
If the magnetOS are nmed correetly, both riming lishts will go
OUt
simllluneously when the
crankshaft
is
turned
in the normal direotion aligning the 25 d
.....
!DIrks witb the drilled hole
in
the starter
housing
or the c:rankase parting ,urfaoes.
q.
DISC:onneCt
timing light. Ascertain
that
the inspection
pilii'
arul
breaker cover are installed and
secure.
r.
Inru.ll harness plate and secure with
",",ws.
s.
Connect
"P"
leads and safety.
t.
Connect starting vibrator lead to the
Left
·200
mqnetos.
u.
Secure engine cowling
7A·H
Startinl Vibrator Cheokinl Procedure.
a.
Measure voltage between vibrator terminal marked
"in"
and the ground teml.lnal while operating
starter. Ou.tput
must
be
a.t
l~t
8·yoLts
on
l2·yoLt systems.
b If voltage is adequate. listen for buzzing of vibrator during starting. If no buzzing
is
heard. eltner
the
vibrator
is
defective or the circuit from the
output
"BO"
terminal on the
vibruor
to the retard (dual
breaker) magneto
is
open. Check
both
switch and retara circuiu. Also check for good elecmcal ground.
c.
Retard
pOintS
may not
be
closmg due to
""TOng
adjusancnt. or may not be clccmcaUy connected
in the
CU'CUlt
due to a poor connection. Inspect
rewd
points to sec if they close. Check for ?roper contact
at
the
SWitch
md
retard terminals of
rcurd
(dual breaker)
mqneto.
and
at
the vibrator. Check
Wiring.
d.
Turn cngtnc
in
proper direction
of
rotation until retard points just open
on
So.
one cylinder
position. Remove input connection from starter to prevent engine turning. Hold
~o.
one plug head
5/16
Inch irom ground; energize \-ibrator by rumlng switch to
start.
Plug
lea.d
should throw a
S/16
Inch spark
Obscrve spark
iilt
plugs
spuk
cap. If spark
is
weak or missing.
try
new
vibrator. If this docs not correct
tfouble. remove magneto and check for Improper internal timing
or
improperly meshed dIStributor
gC3.cs.
2
El
POWER
PLANT
ISSUED:
8118/72
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