Wisconsin vg4d Repair Manual page 42

WlCO MODEL XHG-4 MAGNETO
FOR WISCONSIN MODEL VG4D ENGINES
SERVICE INSTRUCTIONS
40
31
42 36 2..9 49
I
58
21
34 41
Y-95 Series
5
TIMING
The magneto is properly timed to the engine at the factory. If it
becomes necessary to retiree the magneto to the engine, refer to the
diagram and insn"uctions in the engine instruction book.
LUBRICATION
The only lubricating point in the magneto is the cam wiper felt (Ref.
No. 19). This felt, which lubricates the breaker arm at point of contact
with the cam, should bereplaced whenever it is necessary to replace the
breaker contacts.
IMPORTANT
Incorrectly adjusted spark plug gaps cause magneto failure more
frequently than any other condition.
Spark plugs should be inspected at frequent intervals, the size of
the gap should be carefully checked and adjusted and the plugs
thoroughly cleaned.
All oil, grease, and din should frequently be wiped off the
magneto, lead wires, and spark plug insulators. Keeping these pans
clean and the spark plugs properly adjusted will improve the engine
performance and at the same time will prolong the life of the magneto.
DISTRIBUTOR CAP AND ARM
The distributor cap (Ref. No. 43) may beremoved by loosening the
4 screws which hold it in place.
Alter the cap has been removed, the distributor arm (Ref No. 57)
may be pulled off the bridge. When replacing the arm make sure the
timing marks on the distributor arm and the pinion gear are in line.
BREAKER CONTACTS m REPLACEMENT AND
ADJUSTMENT
The breaker contacts should be adjusted to .015" when fully
opened. To adjust the contacts, loosen the two clarnp screws (Ref. No.
44) enough so that the contact plate can be moved.
Insert the end of a small screwdriver in the adjusting slot and open or
close the contacts by moving the plate until the opening is .0l 5", measuring
with a feeler gauge of that thickness, tighten the two clamp screws.
To replace the contacts remove the breaker ~fing clamp screw
39
(Ref. No. 48), the breaker arm lock and washer, (Ref No. 14) and (Ref
No. 18), then lift the breaker arm from its pivot. Remove the spacing
washer and the two breaker plate clamp .,;crews (Ref No. 44). The
breaker plate can then be removed.
[f the con tacts need repl acing it i s recom mended that both the fixed
contact and the breaker arm be replaced at the same time, using
replacement breaker set (Ref No. 46).
After assembly, the contacts should be adjusted as described in
Breaker Contacts paragraph. The contacts should be kept clean at all
times. Lacquer thinner is an ideal cleaner for this purpose. Use WICO
tool S -5449, to adjust the alignment of the contac t,~ so that both surfaces
meet squarely.
CONDENSER
To remove the condenser (Ref. No. 35), In-st disconnect the con-
denser lead by removing the breaker arm ,spring screw (Ref No. 48),
then remove the two condenser clamp .screws (Ref. No. 22), and the
condenser clamp (Ref No. 30). When replacing the condenser make
sure it is properly placed between the two locating bosses and that the
clamp screws are securely tightened.
COIL AND COIL CORE
The coil and coil core must be removed from the magneto housing
as a unit. After the distributor cap and distributor ann have been
removed, and the primary wire disconnected from the breaker ann
spring terminal by removing screw (Ref No. 48), take out the two coil
core clamp screws (Ref No. 21), and remove the clamps (Ref. No. 38).
The coil and core can then be pulled from the housing. When replacing
this group make sure that the bare primary wire is connected under the
core clamp screw and that the insulated wire is connected the the breaker
arm spring terminal.
REMOVAL OF COIL FROM CORE
The coil (Ref No. 40) is held tight on the core (Ref. No. 29) by
spring wedge. It will be necessary to press against the coil core with
considerable force to remove it from the coil. The coil should be
supported in such a way that there is no danger of the primary of the coil
being pushed out of the secondary.