THUNDERBOLT IV AND V IGNITION SYSTEM - 4B-790-823225--1 1096
Rotor/Sensor Wheel
1. Remove distributor rotor/sensor wheel assembly
from distributor shaft. Rotor and sensor wheel
are secured to the shaft with Loctite. Use two flat
blade screwdrivers. The screwdrivers are posi-
tioned opposite each other with the blade tips on
the underside of the rotor and sensor wheel as-
sembly. Make sure blade tips are toward distribu-
tor shaft until they come in contact with shaft. A
downward push on both screwdriver handles at
the same time will pry off rotor/sensor wheel as-
sembly. The use of torch lamp will also aid in the
removal of the rotor/sensor wheel assembly.
!
WARNING
Wear protective gloves when handling heated ro-
tor/sensor wheel assembly to avoid severe
burns.
2. With the rotor/sensor wheel assembly removed,
inspect the locating key inside the rotor.
3. The locating key will appear as a clean edged, 1/8
in. (3 mm) wide, sloped ramp at the bottom of the
splined hole.
72730
b
c
d
a
a - Locating Key
b - Screws
c - Senor Wheel
d - Locating Pin
IMPORTANT: If there is any doubt if sensor wheel
is located properly, lay sensor wheel on top of the
figure above with sensor fingers facing up (to-
ward you). Line up three screw holes and locat-
ing pin hole on sensor wheel with the figure. If
wheel is indexed properly all the fingers on wheel
will line up with those in the figure.
4. If there are pieces of material shaved off the key
or if it appears to have been damaged by being
forced down while misaligned with slot in distribu-
tor shaft, the rotor must be replaced.
5. Check rotor for burned or corroded center con-
tact.
6. Check rotor for cracks and carbon tracks using
magneto analyzer and instructions supplied with
analyzer.
7. If rotor is damaged, replace rotor by removing
three hex bolts and separating sensor wheel
from rotor. Reinstall sensor wheel to new rotor
making sure locating pin on rotor is installed in lo-
cating hole in sensor wheel. Tighten three hex
bolts securely.
8. Bend carbon brush tang upward slightly until a
distance of 1/4 in. (6 mm) is obtained between ro-
tor and tang.
72731
a
a - 1/4 in. (6 mm)
9. Put 2 drops of Loctite 271 into the rotor so it lands
on the locating key.
10. Put 2 drops of Loctite 271 in keyway on upper
portion of distributor shaft.
11. Immediately install rotor assembly onto distribu-
tor shaft. Make sure rotor locating key is aligned
with keyway in distributor shaft before pressing
rotor all the way down on the shaft, until it stops,
with the palm of your hand. Let Loctite cure over-
night with distributor in inverted position.
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