W2-880 Tjd, Thd, Th - Repair - Wisconsin Motors

Y-80 Series
MAGNETO SERVICE INSTRUCTIONS
(TYPE FM-X1-2B7-1)
The adjustment of breaker points is made in the following
manner: Lightly loosen the two contact support locking
screws, identified in Fig. 1. Then. with the points at full
separation, move the contact support until the proper breaker
point clearance is obtained. This is accomplished by means
of a screwdriver inserted in the slot at the bottom of the
contact support and pivoted between the two small bosses
onthe bearing support. Lock assembly ’~,a place by tightening
locking screws, and take a final measurement of breaker
point gap after the locking screws are tightened.
//j-
COIL
../CONDENSER
MEASURE BREAKER
POINT GAP WHEN
OPEN. ADJUST TO
j0.0’( 5 INCH
~. FULCRUM PIN
SNAP RING
GENERAL DESCRIPTION
The type FM-XI-2B7-1 magneto is adapted to the models TE, TF
TH and THD engines manufactured by Wis-Con Total Power Corp.
The magneto is of a split-coil design in that there isn’t any distributor,
°
but instead two sparks are provided simultaneously every 360
of rotation. The magneto is flange mounted, clockwise in rotation
and has a lag angle of 20 ° provided by a special impulse coupling.
SERVICE
PROCEDURE
Improper functioning of the magneto is often believed to be
the cause of engine difficulty arising from other sources,
such as a flooded carburetor, insufficient fuel or air, loose
ignition connections, or a defective spark plug. A brief
engine inspection will often locate the trouble before the
magneto is reached, and prevent maladjustment of parts in
good condition. The magneto should be opened only when
it is certain that the ignition spark produced is unsatisfactory.
This condition may be determined by an ignition
spark test, as explained in engine INSTRUCTION MANUAL.
SERVICING BREAKER POINTS
Remove the magneto end cap and inspect the breaker points
for evidence of pitting or pyramiding. A small tungsten file
or fine stone should be used to resurface the points. Badly
worn or pitted points should be replaced. If it is necessary
to restlrface or replace the breaker points, it will also be
necessary to adjust them to their proper clearance which is
0.015 inch at full separation,
SEALING
LOCKING
==’"’SCREWS
BREAKER ARM
___.__TERMINAL
SCREW
Fig. I END VIEW OF MAGNETO.
MAGNETO
Before replacing end cap on the magneto frame, clean the
contact surfaces between cap and frame. Then coat the end
cap contact surface with Fairbanks-Morse FMCO2 Gasket
Varnish, place a new cork gasket in the joint, mount the
end cap on the frame, and tighten the four screws securely.
FURTHER FIELD SERVICE NOT RECOMMENDED
The cam felt wick, if dry or hard, should be replaced by a
new factory-impregnated wick. Other than this, magneto
does not require field lubrication and any attempt to oil or
grease the bearings is inadvisable. The lubricants should
be renewed only during a comptete overhaul of the magneto
by a Factory-Authorized Magneto Service Center. Coil and
condenser replacements, while simple, are not recommended
unless test equipment is avaitable.
TIMING
MAGNETO TO ENGINE
I~dition timing is accomplished by correctly mounting
magneto to the crankcase. Refer to ’MAGNETO TIMING’ in
engine INSTRUCTION MANUAL for assembly procedure.
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