Evinrude 4906B 4HP 1969 Owner's Manual page 230

TEST LEADS
Testing for a Ground
2-
Obtain a test lamp or continuity me-
ter. Make contact with one probe lead on
the armature core and the other probe lead
on the commutator
or the meter indicates continuity, the arma-
ture is grounded and
Checking the Commutator Bar
3- Check between
as shown in the accompanying
The test light should light, or the meter
should indicate continuity.
tor fails the test, the armature
replaced.
Turning the Commutator
4- True the commutator,
a lathe. NEVER undercut the mica because
AC MILLIAMMETER
bar. If the lamp lights,
MUST be replaced.
or check bar-to-bar
illustration.
If the commuta-
MUST be
if necessary, in
PRESTOLITE STARTER
CORRECT
the brushes are harder than the insulation.
Undercut the insulation between
mutator bars 1/32" to the full width of the
insulation and flat at the bottom.
ular groove is not satisfactory.
under-cutting work is completed,
the slots carefully to remove dirt and cop-
per dust. Sand the commutator
No. 00 sandpaper to remove any burrs left
from the undercutting.
a second time on the growler for possible
short circuits.
Positive Brushes
5-
Notice how the positive brush lead is
attached to the terminal on the end of the
frame. This is the same terminal to which
the heavy battery cable is attached.
terminal may be removed from the frame.
Pull the terminal free of the frame.
Obtain an ohmmeter.
lead of an ohmmeter
other test lead to the terminal.
should be indicated
continuity is not indicated,
be replaced. The brush and terminal
sold as an assembly, eliminating
sity for soldering.
Negative Brushes
6-
The complete terminology for Presto-
lite negative brushes is: Field Coil --Nega-
tive Brush.
INCORRECT
the com-
A triang-
After the
clean out
lightly with
Check the armature
The
Connect one test
to the brush and the
Continuity
on the ohmmeter.
the brush must
are
the neces-
6-41
Ci)
If