Chevrolet 70 1969 Series, Shop Manual

Page: 71 / 913

CAB A N D BODY MOUNTINGS 1-44
Figure 22— Cross Section of W indow Regulator
C h a n n e l
4. Raise window, then install access panel to
bottom of door.
F ig u r e 2 3
— D o o r V e n t
Window
In s ta lle d
DOOR WINDOW RUN
CHANNEL REPLACEMENT
1. Remove door window as explained previ­
ously under "Door Window Glass Replacement,"
2. Remove applicable screws which attach
either division channel or run channel to door
framing (fig. 16) and lower channel(s) through
access opening at bottom of door.
3. Install channel(s) in reverse order of the
removal procedures.
4. Install and adjust window glass as explained
previously under "Door Window Glass Replace­
ment.”
If friction mechanism is adjusted too tight, it
will be difficult to open or close vent. Too loose
an adjustment will result in a fluttering vent or
one having a tendency to close with wind pressure.
If necessary to change vent friction, perform
procedures as follows:
1. Remove access trim panel attached to door
just below vent window with five screws. Figure
23 shows access opening to friction components.
2. Using screwdriver, turn clamp screw (fig.
23) to obtain two to four pounds torque while mov­
ing vent window from a ten degree open position
to a full-open position. Use either a push or pull-
type spring scale positioned at rear edge of
glass. Tightening clamp screw increases oper­
ating tension.
3. After obtaining proper tension, install ac­
cess trim panel.
DO O R VENT W IN D O W
TENSION
ADJUSTMENT
Cab vent windows are of friction type having
a positive theft-resistant latch. Friction mecha­
nism consists of a bushing attached at lower end
of vent shaft which rotates in a stationary friction
clamp.
DOOR VENT W IN D O W ASSEMBLY
REPLACEMENT
N O T E : Door division channel is not part of the
door vent window assembly. However, instructions
CHEVROLET SERIfrS 70-80 HEAVY DUTY TRUCK SH OP M ANUAL