Piper Navajo PA-31 Service Manual page 549

PIPER NAVAJO SERVICE MANUAL
g. 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 over lubricated, remove oil by using a clean, lintless
cloth. If dry, apply one or two drops of Bendix Breaker Felt Lubricant 10-86527.
h. Check the capacitors for looseness in the magneto cover of the harness assembly and
for any physical damage. Using a Bendix 11-1767-1,-2 or-3 condenser tester or equivalent,
check capacitors for capacitance, series resistance and leakage. Capacitance shall be 0.34 to
0.41 microfarads.
i. Check magneto to engine timing per instructions given in paragraph 8B-2 1.
j.
Refer to the latest revision of Lycoming Service Instructions for information regarding
replacement of cam retaining screw.
8B-20. MAGNETO INSTALLATION AND TIMING PROCEDURE. (Timing Magneto to
Engine.)
WARNING
Do not attach harness spark plug ends to the spark plugs until
all magneto to engine timing procedures and magneto to
switch connections are entirely completed.
NOTE
The use of a timing light unit Part No. 1 1-9110 will simplify
the timing procedure. This unit is available from the Bendix
Corporation at Sidney, New York 13838.
a. Remove the spark plug from the No. 1 cylinder and turn the crankshaft in the
direction of normal rotation (for the particular engine being serviced) until the compression
stroke is reached.
b. Continue turning the crankshaft until the 20° advance timing mark is in alignment
with the small hole located on the top face of the starter housing at the two o'clock
position. (Refer to Figure 8B4.)
c. The D-2230 series magneto may be mounted to the engine without removing the
cover from the magneto. The cover also has switch terminal outlets for the right and left
sides of the magneto, located in the center of the harness lead outlet section of the cover.
(Refer to Figure 8B-5.)
NOTE
It is recommended that short adapter leads be fabricated to
facilitate connecting the timing light unit to the switch outlet
terminals of the cover.
Revised: 9/24/81
POWER PLANT
2L3