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8-80
WINDSHIELD WIPER SYSTEM
(5) Remove
the three nuts that mount the motor
to the dash panel and remove the motor out through
the cowl grille panel opening.
lnttallation
(1) Insert the motor in through the cowl grille pan-
el opening and position the motor on the three studs
on the dash panel. Make certain the rubber gasket,
between the motor and the dash panel,
is
properly
positioned.
(2)
Install the three nuts that mount the motor to
the dash panel and connect wiring to the motor. Make
sure the ground strap is screwed to the switch plate
and under one nut.
(3) Position the drive crank on the motor and in-
stall the mounting nut.
(4)
Install the cowl grille panel.
(5)
Install the windshield lower moulding.
(6) Use a suitable tool and install and adjust the
wiper arm and blade assemblies.
WIPER MOTOR
Dkassembly
(1)
Remove the spring retaining clip and washers
on the motor output shaft, noting the sequence of re-
moval of the washers.
(2)
Remove the switch and cover plate.
(3) Remove the gear and shaft assembly.
(4)
Remove the end head through bolts and pull off
the end head using care to avoid damaging the lead
wire to the brush holder on variable speed motors.
(5)
Remove the armature using care to keep the
commutator free of fingerprints and oil.
Assembly
(1)
Insert the armature into the motor assembly.
(2)
Install the end head and end head through bolts
using care to avoid damaging the lead wire to the
brush holder on variable speed motors.
(3)
Install the gear and shaft assembly.
(4)
Install
the
washers on the motor output shaft,
make certain the washers are installed in the proper
order, and install the spring retaining clip.
(5)
Install the switch and cover plate.
Wiper Motor Inspection
(1) Thoroughly inspect the motor parts for wear,
corrosion or damage.
(2)
Clean the armature commutator with 00
or
000
sandpaper or
if
necessary due to excessive wear re-
place the windshield wiper motor.
(3)
Replace worn or oil soaked brushes.
(4)
Inspect the gears for worn or broken teeth and
replace gears showing damage or excessive wear.
(5) Remove the seal, which
is pressed into the
housing at the output shaft, while being careful not
to damage the inside diameter
of the housing. Press
in a new seal before reassembling the wiper motor.
(6) Replace the gasket under the park switch cover.
WIPER SWITCH
Variable Speed
The switch contains a rheostat which provides a
means of controlling the amount of current which
flows to the motor. The switch is designed to provide
a
circuit to the motor to reverse the current to the
field winding which in turn reverses the direction of
the armature. A circuit breaker, built into the switch,
protects the wiper motor circuitry.
To test the switch, disconnect the wiring to the
switch and remove the switch from the instrument
panel. Using a continuity tester or an ohmeter, test
for continuity, no resistance, between the contact
terminals of the switch as shown in the following
chart. For test purposes the "Park" position is when
the switch is in the
"Off"
position. The "Low" posi-
tion is when the switch is just turned "On." The
"High" position is when the switch knob is rotated
to the high or maximum wiper speed position. In the
test chart the reference "Ground" means to attach
one lead of the continuity tester or ohmeter to the
case of the switch. The bench test of the switch
does
not
require the use of a
12
volt battery.
VARIABLE SPEED SWITCH
CONTINUITY CHART
Park
low
High
B
to
B/U.
B
to
B/U.
B
to B/U.
B/U to P.
B/U
to A.
B/U to
A.
A to
F2.
A
to F1.
*A
through the
F1
to
Ground.
F2 to Ground.
rheostat
to
F1.
P-open.
F2 to ground.
Pspen.
*As the switch knob is rotated the resistance shown
on the ohmeter should vary from a high reading to a
low reading in a smooth rate of change or
if
a con-
tinuity tester is being used the brightness of the test
lamp should vary from bright to dim.
Single Speed
The switch contains
a built-in circuit breaker to pro-
tect the motor circuitry and
is
serviced only as an as-
sembly. To test the switch, refer to the proper wiring
diagram, disconnect the lead wires and remove the
switch from the instrument panel. Connect a test
lamp between
"B"
terminal of the switch and nega-
tive battery post. Connect the positive battery termi-
nal to the "P" terminal of the post. Lamp should re-
main lighted in either
"ON"
or "OFF" position. Fail-
ure to light indicates a faulty circuit breaker.
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