Piper SARATOGA PA-32-301 Maintenance Manual page 510

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
ELECTRICAL POWER SUPPLY.
MAGNETOS.
INSPECTION OF MAGNETO.
After the first 50 hour period and every 100 hours thereafter, the magneto ignition system should be
checked. If engine operating troubles develop which appear to be caused by the ignition system, it is advisable
to check the spark plugs and wiring first before working on the magneto. Should trouble appear definitely
associated with the magneto. the most effective measure is to install a replacement magneto which is known to
be in satisfactory condition and send the suspected unit to the overhaul shop for rest and repair. Should this
not be possible. a visual inspection of the following items may disclose the source of trouble.
1. Check the lead terminals for definite contact with spring contacts in outlets.
2. Remove the harness outlet cover from the magneto and inspect for the presence of moisture and
carbon tracking due to moisture.
3. Check contact springs in distributor block for evidence of spark erosion.
4. Check height of contact springs (0.422 maximumfromtopofblocktower tospring). (Referto Figure
74-2.)
5. With the cover and harness separated from the magneto housing, check contact assemblies to see that
cam follower is securely riveted to its spring.
6. Examine the contact points for excessive wear or burning. Figure 74-1 shows how the average contact
point will look when surfaces are separated for inspection.
- CAUTION -
Do not open point contacts more than .0625 of an inch for
examination of contact surfaces. Excessive spreading of the breaker
points will overstress and damage the contact spring.
Desired contact surfaces have a dull gray. sand-blasted (almost rough) or frosted appearance, over the
area where electrical contact is made. This means that points are worn in and mated to each other, thereby
pro iding the best possible electrical contact and highest efficiency of performance. Minor irregularities or
roughness of point surfaces are not harmful. (Referto Figure 74- .center.) Neither are small pits or mounds. if
not too pronounced. If there is a possibility of pit becoming deep enough to penetrate pad (refer to Figure 74-1.
right), reject contact assembly.
-NOTE -
No attempt should be made to stone or dress contact points. Should
contact assembly have bad points or show excessive wear, the
complete contact assembly should be replaced.
7. Check condition of cam follower felts for proper lubrication. If oil has migrated from one follower
felt to another. it may be necessary to remove the lubrication from one felt strip while oiling another. If felt is
overlubricated, remove oil by using a clean, lintless cloth. If dry, apply one or two drops of Bendix Breaker Felt
Lubricant 10-86527.
74-10-02
Page 74-03
Issued:
January 2, 1980
2K3