MerCruiser 305 CID (5.0L) Service Manual page 304

SERVICE MANUAL NUMBER 24
Rotor / Sensor Wheel
Removal
1. Remove distributor rotor / sensor wheel assembly from distributor shaft using two flat
blade screwdrivers. Position the screwdrivers opposite each other with the blade tips
contacting the shaft. A downward push on both screwdriver handles at the same time
will pry off rotor / sensor wheel assembly. The use of a heat lamp will also aid in the
removal of the rotor / sensor wheel assembly.
Wear protective gloves when handling heated rotor / sensor wheel assembly to
avoid severe burns.
Cleaning and Inspection
1. Inspect the locating key inside the rotor. The locating key will appear as a clean edged,
1/8 in. (3 mm) wide, sloped ramp at the bottom of the splined hole.
NOTE: 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 (toward you). Line up three screw holes and
locating 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.
2. Check rotor for burned or corroded center contact or damaged key.
3. Check rotor for cracks and carbon tracks.
Index
90-861327--1 OCTOBER 1999
a - Locating Key
b - Screws
c - Senor Wheel
d - Locating Pin
WARNING
b
a
d
IGNITION SYSTEM
c
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