Evinrude 4906B 4HP 1969, Owner'S Manual

Page: 220 / 422

Positive Brushes
7- The positive brush or brushes can
always be identified as the brushes connect-
ed to the field coil.
Obtain an ohmmeter. Connect one lead
of the meter to the end of the brush and the
other
lead to the terminal. The ohmmeter
MUST indicate continuity between the
brush and the terminal. If the meter indi-
cates any resistance, check the lead to the
brush and the lead to the positive terminal
solder connection. If the connection cannot
be repaired, the brushes MUST be replaced.
If the unit being tested has a double set of
positive brushes, repeat the test for the
other positive brush.
Move the test lead from the brush to a
good ground on the frame. If continuity is
indicated, the field coil is grounded to the
case.
Negative Brushes
8- The negative brushes can always be
identified because the lead is connected to
the brush retainer as a ground to the frame.
Obtain an ohmmeter. Make contact with
one lead on the negative brush and make
contact with the other lead on the starter
frame. If the meter does not indicate
continuity, the brush or brush retainer is not
grounded to the frame.
If the unit being tested has a double set
of negative and positive brushes, move the
test lead from the one negative brush to the
other negative brush lead and again check
for continuity. If the meter does not indi-
cate continuity, the brush or brush retainer
is not grounded to the frame.
Check to be sure none of the soldered
connections are touching the frame. The
DELCO-REMY STARTER 6-31
fields would be grounded if the connections
make contact
with the frame.
CLEANING AND INSPECTING
Clean the field coils, armature, commu-
tator, armature shaft, brush-end plate and
drive-end housing with a brush or compress-
ed air. Wash all other parts in solvent and
blow them dry with compressed air.
Inspect the insulation and the unsoldered
connections of the armature windings for
breaks or burns.
Perform electrical tests on any suspect-
ed defective part, according to the pro-
cedures outlined earlier in this Section.
Check the commutator for run-out.
In-
spect the armature shaft and both bearings
for scoring.
Typical brush spring. If the springs have turned blue
in
color, they must
be
replaced.