Piper CHEROKEE WARRIOR PA-28-151 1995 Maintenance Manual page 249

PIPER CHEROKEE WARRIOR SERVICE MANUAL
c. Disconnect the ground lead at the magneto.
d. Remove the nuts and washers and remove the magnetos from the engine.
8-21. INSPECTION OF SLICK 4000, 4200, AND 4300 MAGNETOS.
The 4000 series magnetos require very little inspection. These units are sealed and tampering with
them will void their warranty. (Refer to the latest revision of Textron Lycoming Service Letter No. L177 and
Slick pro rata instruction form (No. 1001).
The 4200 and 4300 series magnetos can be inspected in the field.
Perform the following checks at the time of engine inspection, or when a magneto has been removed
from the engine:
a. Check magneto to engine timing:
1. 4000 series: every 200 hours time-in-service, or at annual inspection, whichever comes first.
2. 4200 and 4300 series: every 100 hours time-in-service, or at annual inspection, whichever
comes first.
b. Inspect the distributor block for cracks and burned areas.
c. Use the following steps to check the contact assemblies on 4200 series for burning and wear every
500 hours time-in-service.
1. Inspect the points for discoloring. If points have a white frosty surface around edges the
points are functioning properly. Apply M-1827 cam grease sparingly to each cam lobe before reassembly.
Point opening for the 4200/4300 series magnetos is critical. To
obtain the most efficient spark set breaker points to
0.008-0.010 inch.
2 . Inspect points for discoloring and pitting. If these conditions are evident replace both
c o ndenser and points.
3. Recheck the gap after retainer screws have been tightened, (Refer to Paragraph 8-26 for
assembly.)
d . Every 500 hours time-in-service, use the following steps to inspect the carbon brush in the distributor
gear for wear, cracks and chipping :
1. Measure carbon brush length from distributor gear shaft to end of brush. Minimum length is
1/32 inch. If the above conditions are evident the distributor gear must be replaced.
2. Check bearing in distributor block and bearing bar for lubrication. If required put a drop of
SAE #20 non-detergent oil in each oilite.
e . Inspect the high tension lead from the coil to ensure it makes contact with the carbon brush on
d i stributor gear shaft.
f. Each 500 hours time-in-service, visually inspect the impulse coupling shell and hub for cracks,
loose rivets or rounded pawls. Replace coupling, if any of these conditions are evident.
g . Look for frayed insulation or broken shielding wire strands in the leads at the back of the
m a g n etos. Check that terminals are secure and properly positioned.
h . Check the lead conduits. A few broken shielding strands are acceptable. If the insulation is
d e t er iorated replace it. The special high temperature coating, used on the harness is provided chiefly for
v i b r ation resistance and mechanical protection. The integrity of the harness is not sacrificed if small areas of
the shielding braid show peeling or flaking of this coating.
i. Check the springs for breaks, corrosion, or deformation. If possible, check continuity from block
with tester or light.
Revised: February 28, 1995
Effectivity
NOTE
1K9
Island Enterprises
POWER PLANT
Magneto (SLICK)