Battery Ignition - Wiring And Timing Diagram; Distributor - Battery Ignition; Solid State Ignition Distributors; Distributor Timing - Wisconsin vg4d Repair Manual

BATTERY
' II----
I SWITCH
~1~"
I
DISCHARGE j~ CHARGE~ ~_~
~~'(" SPARK
PLUGS
/~
AMMETER
,
~
u.-~ ~ ~ ~ ; ......... ~o~e ....
STARTER
AUTOMATIC ]'
I
~WITCH
SWITCH
CHOKE
i
r~
~ I
SOLENOID STARTING SWITCH
FOR REMOTE STARTING IN PLACE ~
HI-TEMPERATURE ~
~HALF-SPEED DISTRIBUTOR
0F STARTER SWITCH (OPTIONAL)
5~FETY SWITCH
~WHEN SPECIFIEO) "NEGATIVE GROUND CIRCUIT ILLUSTRATED"
Fig. 12, BATTERY IGNITION - WIRING AND TIMING DIAGRAM
flange gasket is in place.
No. 1 terminal is identified on the magneto cap. The other
terminals follow the firing order of 1-3-4-2 in a clockwise
direction viewing cap end. Leads from magneto should be con-
nected to spark plugs of corresponding numbers, see "Firing
Order" paragraph.
When magneto is properly timed the impulse coupling will snap
when 'De'- 'X' marked vane of flywheel lines up with the mark
on flywheel shroud, which indicates the centerline of the No. 1
and 3 cylinders. This can be checked by turning cranlcshaft over
slowly by hand. The impulse will also snap ever}, 180 ° of
flywheel rotation thereafter.
The spark advance is 23 °. To check timing with a neon light, the
rtmning spark advance is indicated by a 1/8" diameter hole on the
flywheel shroud, 23 ° or 3-7/16 inches, before centerline of the
No. 1 and 3 cylinders. See fig. 11. The end of the 'X' marked vane
should be whitened for this operation.
The magneto rotates at crankshaft speed in a clockwise direction
when viewing drive gear end. The rotor turns at half engine speed.
DISTRIBUTOR - BATTERY IGNITION
On engines equipped with Flywheel Alternator o:r direct mounted
Generator, battery ignition is used in place of magnet() ignition.
The distributor is of the automatic advance type, and rotor turns
at one-half engine speed in a counter-clockwise direction. Fig. 15
illustrates an early style distributor which is mom~ted to the end
of the generator. Newer engines with Flywheel Ahemator or belt
driven alternator have the distributor mounted to an adapter
attached to the gear cover.
The spark advance for normal speeds is 23 ° , the same as for
magneto ignition. Engine must be running at 2000 R.P.M. or
over when adjusting spark advance.
ELECTRICAL WIRING CIRCUIT
Note: Beginning with engine serial No. 3979526 the standard
wiring circuits for all 12 volt electrical equipment is negative
ground polarity, in place of the previously furnished positive
ground. All 6 volt systems remain positive ground.
The wiring diagram, Fig. 12, illustrates a negative ground
circuit. If polarity of generator is for a positive ground circuit
(engines built previous to serial No. 3979526, terminal con-
nectlons at ammeter, ignition coil and battery are just reversed
from those illustrated.
SOLID STATE IGNITION DISTRIBUTORS
Many Wisconsin engines are now being equipped with a solid
state ignition distributor. Detailed troubleshooting and repair
information can be found in the rear section of this manual.
For repair parts, see your VG4D Illustrated Parts Catalog.
DISTRIBUTOR TIMING
Remove screen over the flywheel air intake opening. This will
expose the timing marks on flywheel shroud, also the vane on
flywheel, marked by an 'X' and the letters 'De'. See Fig. 13.
Next, remove the spark plug from No. 1 cylinder and turn
engine over slowly by the starting crank, at the same time hold
a finger over the spark plug hole to determine the compression
stroke.
Upon reaching the compression stroke, continue turning
crank until the leading edge of the marked vane on the
flywheel is in line with the centerline mark on the flywheel
shroud of the No. 1 cylinder. See Fig. 13. The No. 1 piston is
on top dead center in this position.
Remove distributor cap. The centerline of the distributor
rotor should be in line with the center of the notch in the
distributor housing. No. 1 cylinder is ready to fire in the
retarded timing position, when the distributor rotor is in this
position, See Fig. 14. If distributor rotor is not in the above
mentioned position, withdraw the entire distributor.
Remove distributor rotor and take off the dust cover to expose
the breaker points. Mount rotor back on distributor shaft.
Assemble distributor with the distributor rotor in line with the
notch in the distributor housing, as shown in Fig. 14, and the
primary terminal pointing toward the generator circuit
breaker. See Fig. 15. Be sure that advance arm lockscrew,
Fig. 14, which is mounted to the distributor clamp is tight, as
a manual spark advance is not used with these engines.
13