Transformer Assembly - Piper PA-24 Comanche Service Manual

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PIPER COMANCHE SERVICE MANUAL.
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" " " ' \ : - - - - - - - TIMING MARK
FIGURE 7B·13. ENGINE TIMING MARKS
iB~l.
TrlQlf'onncr Aucmbly.
a.
Check tn.nsfor:ncr uscmbly for cracks in the casing or for bent or broken mounting brackets.
Inspect outlets for damaged or stripped threads.
b.
l'sing
an ohmmeter, measure the resistance of the primary and secondary winding of the
transfonner uscl'ftbly. Check primary resistance between pin of small connector and transformer housing.
Resistance shall be
1
to 3 ohms. Measure secondary mistance between pin of qe connector and
transformer housing. Resistance shall be 10.000 to 14.000 ohms.
c. If transfonner assembly is damlfed or it fails the test. remove four screws securing it to mqneto
housll\g. Install new transfonner assembly and torque securing screws to Z'·30 lb. in.
iB-U. MqnftO TiminJ. (Timin. MapetO to Enpne) Check each unit for proper magneto rctaeion before
placing either unit on the engine. If the magneto is of the COlTeet rotation. tum magneto rotor shaft in
direction of rotation until the timiftl mark on the drive member is approlrimately in alignment with 1n
indent on drive end of magncco housing. One of the painted
l~nC$
on the distributor block should also be In
alignment when viewed through the opening marked "T" in the housing. When viewed from drive end of
the magneto. the painted line on the right side of distributor finger is for clockwise rotation. and the
painted line on the left side
15
for counterclockwise rotation..\\qneto is now
:'>00.
1 cylinder advance firing
posmon.
~OTE
The lines on the distnburor finger and distributor block as described In
previous parlifaph. arc for reference onlv. Absolutely no adjustment of
contact pome opening from these marks sha.Jl be used
15
an indicanon or
proper internal magneto timing.
POWER PLANT
REVISED: 4/10/81
2
F17