W Indshield W Ip E; Cowl Ventilator G Rille - Chevrolet 1977 light duty truck Service Manual

W IN D S H IE L D WIPERS
W indshield wiper units on all models are o f the two-
speed electric type. A single w iper motor unit, mounted
to dash panel at top and to left o f engine cover inside
cab, powers both wiper
operatin g link rods and pivot mountings on these models
are located in the outside air inlet plenum chamber.
Arm Adjustm ent
To adjust sweep o f blades turn on wipers, then note
sweep o f arms. If necessary, remove one or both arms as
follows: Pull outer end of arm away from glass which
will trip lock spring at base of arm and release spring
from undercut o f pivot shaft. W hile holding arm in this
position, pull outward on cap section at base o f arm to
remove arm. Arm can be reinstalled in any one o f
several positions due to serrations on pivot shaft and in
arm cap. See figure 2D-95.
W IP E R ARM PIVO T SHAFTS AND LINK
R O D — FIG. 2D-96
Removal
1. Remove windshield wiper
shafts. Procedure for rem oving
previously under "A rm Adjustments."
2. Remove screws which attach outside air cowl
ventilator grille to cowl. Carefully remove grille from
cowl.
3. At center o f cowl, remove two attaching nuts
which attach link rod to motor drive. Disengage link
rods from pins.
4. Remove screws which attach each arm transm is­
sion pivot shaft assembly to cowl. Remove pivot shaft
assembly with link rod from plenum chamber.
Installation
1. Place pivot shaft assembly with link rod into
position at cowl bracket. Secure assembly to bracket with
two screws.
FRONT END
blades. The wiper blade
arms from pivot
arms is explained
2. Attach end o f link rod to motor drive and arm.
Secure rod with the two attaching nuts.
3. Install outside air cowl ventilator grille to top of
cowl.
4. Before installing wiper arms, operate wiper
motor m om entarily which should rotate pivot shafts to
park position. Install arms.
COWL V E N TILA TO R GRILLE
Replacement
1. Remove windshield wiper blades.
2. Remove screws retaining grille, figure 2D-97.
3. Remove grille and seal.
4. Reverse above steps to install grille.
Fig. 2D-96--W indshield Wiper Linkage