Piper Comanche PA-24 Service Manual page 440

PIPER COMANCHE SERVICE MANUAL'
I.
Tipt." the twO mounting nua Uld repllct: the inspectiOD pi ....
m. After tightening magnero mounting Dua check timing to make OUR it is
Ki1l correct.
n. lastall the other .......
etO
and time
usiDJ
the preccciiDg iDstnactioas A
tbroup
M.
o. With both ....... cto. timccl
to
the
casiDC
Uld sec:urccl. check that they
rlR
t"lethcr. Rotate tbe
cranksbaft opposite DOnna! rotatiOD to approximately
35
cIcpecs
BTC with No.
1
cylinder OD the
compression molr,e.
p. If the ....... ctOS
aft
timccl COrTectly. both timing /isba will go OUt simulaacously .... hc.n the
cranksbaft
is
tumccl in the normal clirec:tion alipIinl the 25 degree !!WIts with the drillccl bole in the starter
houliDJ or the crankcuc panins swfaces.
q.
DiscoDllect
tiI:aiDJ
lisht. AsecrtaiD that the inspection pi ....
aacI
breaker
cover
an: installccl
ancI
sccurc.
r. Install harncu pwe Uld seCUft with
1CftWS.
s.
COIUICct "P" leads Uld safety.
,. COIlDCct starting vibrator lcad
'0
the left ·200 ....... cto.
u. Secure e"line cowling.
7-45. Stan:iaJ Vibrator CheelWIJ
ProcccIurc.
.. Measure YOlute between vibrator ,enninal marltccl "in"
ancI
the ground terminal while operatiDg
Starter. Output must be
at
least 8 YOla on 12 YOlt systems.
b. If voltqe
is adequate.
listcn for bllZZiDg of vibrator
dllriDs
startiDJ.
If no bllZZiDg is hcarcl. either
the vibrator is clcfective or the circuit from the output "BO" ,cnnina1 on the vibrator
'0
the retard (dual
btcakcr) IIIIJDctO
is
0,.".
Check both swi,ch aacI retard cin:uiu. Also check for
Joo<l
electrial grouDd.
c. Rctarci points may DOt be clo.ing due to WEO", adjUltlll ... ,. or may be electrically cOIlDCctccl in
the circuit due to a poor CODDec:tiOD. lasp..,t retard poinu
'0
see if they close. Cbeck for proper contact
at
the switch and retard ,erminals of retard (dual
breaker)
mapcto iIIld at the vibrator. Check wiring. "
d. Tum engine in proper direction of rotation until retard points just open No.
1
cylinder
position~
Remove inpu, connection from sarter
'0
pment e"line ruming. On the PA·24-!80. PA·24-2'O
.riel
PA·24-260 hold No.
1
pi ... lead
5116
inch spark. On the PA·2+-WO check spark by remo"", spark plug',
connecti", lead
'0
plug and grounding plug. Observe spark at plugs spark cap. If .park is weak or
milling
try
new vibrator. If this does not correct trouble remove magneto and check for improper intcma.l
timing
or
improperly meshed disaibutor gean.
CAUTION
When checking vibrator a.roon. stand clear of propeller or remove spark
pi ... ,ermin&ls.
POWER PLANT
ISSUED:
8/18172
2 814