Chevrolet 10 Series 1970 Service Manual page 134

BODY IB -56
reposition d ivision channel by loosening appro­
pria te attaching screw s.
DOOR W IN D O W GLASS HO R IZO N TAL
SEAL REPLACEMENT (Fig. 1 2 8 )
1. Rem ove access panel fro m bottom of door. This w ill
rem o ve window stop attached to access panel and
allow top of window to be low ered to a point below
h orizon tal w eath erstrip s.
2. Using a fla t-b la d e s c re w d riv e r, p ry w eath erstrips
fro m door.
3. In stall w eath erstrip s to door, making sure retaining
clip s a re fu lly engaged.
4. R aise window, then in sta ll access panel to bottom
of door.
DOOR VENT W IN D O W TENSION ADJUSTMENT
Cab vent windows a re o f the fric tio n type having a
p o sitive th eft-resistan t latch.
consists of a bushing attached at lo w e r end of vent shaft
which rotates in a stationary fric tio n clamp.
If fric tio n m echanism is adjusted too tight, it w ill be
difficu lt to open o r close vent.
w ill result in a flu tterin g vent or one having a tendency
to close with wind p ressu re.
If n ecessa ry to change vent fric tio n , p e rfo rm p ro ­
cedures as follow s:
1. R em ove a ccess trim
below vent window with fiv e
shows access opening to fric tio n components.
2. Using s c r e w d riv e r, turn clamp s c re w to obtain two
to four pounds torque while m oving vent window
fro m a ten d e g ree open position to a fu ll-op en p o si­
tion. Use eith er a push o r pu ll-type spring scale po­
sitioned at re a r edge of glass.
scre w in crea ses operating tension.
3. A fte r obtaining p ro p e r tension, in stall access trim
panel.
DOOR VENT GLASS REPLACEMENT
Removal
1. Rem ove sm all access panel fro m inner side of door
below vent window.
Vent W indow Glass
Flat Washer
Nylon Friction
F ig . 130— Door V ent W in d o w
The fric tio n mechanism
T oo loose an adjustment
panel attached to door just
screw s. F igu re 133
Tightening clamp
v e m v v m a o w io p
Retaining Screws Channel
Screw
ACCESS HOLE TO PIVOT SCREW
Vent W indow Outer
Frame and Rubber Seal
Division Channel
Frame To Door Screw
Frame To Divisional
Channel Screw
Friction Bushing
and Clamp Removed
F ig . 131—Removing V e n t W in d o w
2. A t bottom of vent glass (fig . 130), place hand to catch
vent fric tio n components, then rem ove sc re w fro m
fric tio n clamp. Slide clamp, fric tio n bushing, and
fla t s te e l w asher fro m vent shaft.
3. A t top of door through sm a ll access opening turn
vent upper pivot s crew fro m vent fra m e.
NOTE: Screw need not be rem oved com pletely,
just enough to becom e disengaged fro m
glass channel.
4. R em ove sc rew s attaching division channel to vent
channel just below vent latch. Using a s c re w d riv e r,
p ry down on vent channel as shown in fig u re 131,
which w ill cause upper part of channel to becom e
disengaged fro m p ivot screw .
lo w er pivot shaft up out of vent channel.
5. R em ove two screw s which attach glass upper channel
to glass lo w e r channel (fig . 132).
6. Apply P re p -S o l o r equivalent on vent glazin g rubber
to soften old rubber.
ficien tly , separate channel, and rem ove glass.
Upper Channel
G la zin g Rubber
F ig . 132—V e n t W in d o w Disassembled
Screws Removed
Channel
vent
Rotate glass channel
When rubber softens suf­
Block
Soft Ham m er
Steel W asher —
Bushing Clam p.___
N ylon Friction Bushing
CHEVROLET TRUCK SERVICE MANUAL