Piper COMANCHE PA-24-180 Service Manual page 380

PIPER COMANCHE SERVICE MANUAL
FIGURE 7A-19. TIMING PLATE INSTALLED
FIGURE 7A-20. BREAKER COMPARTMENT WITH
ON BREAKER COMPARTMENT CAST TIMING MARKS
b. Find neural posriton of the
magero
drive by routing drive coupl ing in left hand direction unol
the red or white chamfered tooth on the distribuor drive gear ppeus through the immng inspection hole.
At the same locaron, the drive should feel to have fallen into a notch or neural position.
c. Hold the magneto drive m the neumia position and bend the timing pointer until it indicates 0
°
on
the timing plate or in the breaker compartment.
d. Rotate the drive coupling from neutral in a left hand direction 10'. Appear through the tmuing
hole and align the chamfered tooth of the distributor ger with the white line of the distributor block.
Ascerain that the main breaker poinr open at ths point and the pointer indicates 100 on the place or "E"
gap in the breaker compartment.
e.
Without moving the dnve coupling from the "E" pp or 10 after.neutral position, bend the points
back to the 00 mark.
f.
Using Data Table VIIA-II determine the degree retard of the magero being checked. Normally the
correct reard setting will be tamped in bottom of breaker compartment for convenience.
g. Turn the drive coupling in the left hand direction until the pointer reaches the required number of
degrees retard. The retard breaker points should open at thu point.
h. Rotate drive coupler until cam follower is on the high point of the cam lobe. Measure contact
clearance. It must be 0.018 ± 0.006 or the points must be replaced.
CAUTION
If cam screw was removed, be sure to reinstail and torque to 25 inch
pounds.
POWER PLANT
ISSUED: 8/18/72
2 D22