Cessna SKYMASTER 336 1964 Service Manual page 163

der, No. 2 magneto outlet to the next cylin-
der to fire, etc. Cylinder firing order is
1-6-3-2-5-4.
2 ¼ I N.
SOFT WIRE
SOLDER 3/4IN.
CAM WASHER
Figure 10-20. Timing Pointer
Figure 10-21. Template and Pointer
Attached to Breaker Compartment
should break at the advance firing position of No. 1
cylinder listed above. Rotate magneto case to make
contacts break at correct position.
CAUTION
Do not adjust contacts to compensate for in-
correct magneto-to-engine timing. Breaker
contact adjustment is for internal timing only,
and any readjustment after internal timing
has been accomplished will result in a weaker
spark, with reduced engine performance.
f. After tightening magneto mounting clamps and
rechecking magneto-to-engine timing, remove tim-
ing equipment. Install and connect any spark plugs
that were removed.
g. Install timing inspection plug, breaker compart-
ment cover, any noise filters that were removed,
and magneto "P" lead.
h. If right magneto is being installed, connect
tachometer pick-up coil installed in bottom of mag-
neto.
i. Install high-tension outlet plate.
NOTE
The No. 1 magneto outlet is identified with
the number "1."
The magneto fires at each
successive outlet in direction of rotation.
No. 1 magneto outlet routes to No. 1 cylin-
j. Reinstall cowling removed for access.
10-104. MAINTENANCE. At the first 25-hour in-
spection and at each 100-hour inspection thereafter,
the breaker compartment should be inspected. Mag-
neto-to-engine timing should be checked at each
100-hour inspection. If timing is 20° (plus zero,
minus 2 °), internal timing need not be checked. If
timing is out of tolerance, remove the magneto and
set internal timing, then reinstall and time to the
engine.
NOTE
If ignition trouble should develop, spark plugs
and ignition wiring should be checked first.
If the trouble appears definitely to be associ-
ated with a magneto, the following may be
used to help disclose the source of trouble
without overhauling the magneto.
a. Moisture Check.
1. Remove the high-tension outlet plate, cables,
and grommet, and inspect for moisture.
2. Inspect distributor block high-tension outlet
side for moisture.
3. If any moisture is evident, lightly wipe with
a soft, dry, clean, lint-free cloth.
CAUTION
Do not use gasoline or other solvents, as
these will remove the wax coating on some
parts and could cause electrical leakage.
b. Breaker Compartment Check.
1. Remove breaker cover.
2. Check all parts of the breaker assembly for
security.
3. Check breaker contacts for excessive wear,
burning, deep pits, and carbon deposits.
Contacts
may be cleaned with a hard-finish paper. Replace
defective breaker assemblies.
Make no attempt to
stone or dress contacts. Clean new contacts with
clear, unleaded gasoline before installing.
4. Check cam follower oiling felt. If it appears
dry, re-oil with 2 or 3 drops of lubricant (Scintilla
10-86527, or equivalent).
Allow about 30 minutes
for the felt to absorb the oil, then blot off excess
with a clean cloth. Too much oil may result in foul-
ing and excessive burning of contacts.
5. Check that the condenser mounting bracket
is not cracked or loose. If equipment is available,
check condenser for a minimum capacitance of .30
microfarads. If equipment for testing is not avail-
able and a defective condenser is suspected, replace
with a new one.
c. If the trouble has not been corrected after
accomplishing steps "a" and "b," check magneto-
to-engine timing. If timing is not within prescribed
tolerance, remove magneto and set internal timing,
then reinstall and time to the engine.
d. If the trouble has still not been corrected, mag-
neto overhaul or replacement is indicated.
10-47