3.
Carefully guide magneto gear into engagement with cam gear
--
make sure mark remains
centered and magneto gear remains stationary when installing. Secure magneto to gear
housing with two capscrews.
4. To check for proper timing, rotate engine by hand until a loud click
is
heard
-
-
at this
instant the DC mark on flywheel should be just past the center of the timing sight hole on
engine.
For precision timing of the ignition system use timing light.
Carefully follow light manufacturer's
instructions.
Never connect battery to magneto as this will damage windings.
Time magneto ignition
as follows:
1. Start engine and run at 1200 RPM.
2.
Aim timing light into sight hole on engine. SP mark should be centered in sight hole just
as light flashes. To adjust, loosen two capscrews on magneto mounting flange and shift
position of magneto until SP mark
is
centered
--
on LPG fueled engines it is permissible to
increase advance slightly
-
-
on these engines the SP mark can be set slightly to the left of
center (facing front of engine) when the light flashes.
When proper timing is attained,
secure magneto flange capscrews.
SHIELDED
MAGNRTO (FAIRBANKS
-
MORSE FM-XE1-2B44)
The shielded type of magneto can be identified by the large metal end cap and screw type termi
-
nals.
These magnetos are
preluhricated during assembly and normally require no further lubrication.
After each
500
hours of operation, the end cap should be removed and the condition of the contact
points and carbon brush should be checked.
If the points are dirty, clean with lacquer thinner and
coarse cloth. If slightly pitted, dress with small tungsten file or
a
fine stone.
Badly pitted contact
points must he replaced.
Regap contacts after service or replacement.
The carbon brush in the end car, should be under slieht oressure and should move freelv in its
-.
holder. Replace brush if unevenly
or
excessively worn.
Use
the following procedure to replace
breaker contacts:
1.
To remove breaker arm, remove breaker arm terminal screw (which releases coil, con
-
denser and ground leads and breaker arm spring) then remove snap ring on fulcrum pin
and lift breaker arm off pin.
Discard old breaker arm.
2.
To remove contact support bracket, remove two locking screws (including lock and plate
washers) then remove bracket from bearing support.
3.
Reverse procedure to replace contact support and breaker arm.
Gap must be adjusted
after replacement.
To adjust contact point gap use the following procedure:
1.
Loosen the two locking screws on contact support.
2. Insert screwdriver blade in horizontal slot on support then shift support (pivot blade
between two small bosses) until proper clearance of
,015" (maximum opening)
is
measured
between contacts. Lock support in place with two capscrews then recheck clearance after
support has been secured.
Magnetos are timed to the engine in the factory and
retiming should not be necessary unless mag
-
neto has been removed for reconditioning.
Use
the following procedure for initial timing of the stand
-
ard type magneto to the engine.
1.
Uncover timing sight hole on blower housing of engine. Turn engine over by hand until DC
mark on flywheel is centered in sight hole.
2. Turn magneto gear in clockwise direction (when facing gear end) until impulse coupling
trips
-
-
loud click will be heard.
After coupling trips, back up slightly (turn in counterclock
-
wise direction) on gear until it drags lightly and remains in stationary position.
3.
Place new gasket on flange then while holding gear in timing position attained in Step 2,
carefully guide magneto gear into engagement with cam gear.
4.
After securing magneto to housing, test by turning flywheel in clockwise direction until
impulse coupling trips (loud
click)--DC mark on flywheel should be just past center mark
in sight hole.
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