Chevrolet 70 1969 Series, Shop Manual

Page: 176 / 913

REAR SUSPENSION 4B-37
2. With cross tube and rocker arm safely sup­
ported, remove nuts and lock washers from spring
cap. Remove spring cap and cross tube to spring
cap U-bolts.
3. At axle brackets, remove nuts, washers,
and bolt. Pry adapters from bushings and brackets.
4. Lower the cross tube and rocker arm, then
slide the rocker arm from end of cross tube.
R O C K E R A R M INSPECTION (Fig. 18)
1. Inspect rocker arm end bushings for evi­
dence of damage or deterioration of the rubber. If
damage or deterioration is evident, replace bush­
ings as directed later under "Rocker A rm Bushing
Replacement."
2. Inspect cross tube bushings (Inset, fig. 18)
for evidence of damage or deterioration of rubber.
If damage is evident, replace bushing as directed
later under "Cross Tube Center Bushing Replace­
ment."
R O C K E R A R M BUSHING R E P L A C E M E N T
Press old bushing out, using a suitable driver
to exert force on bushing outer sleeve. Press new
bushing into place, exerting force on bushing outer
sleeve until outer sleeve extends an equal distance
through rocker arm at both sides.
CROSS TUBE C E N T E R BUSHING R E P L A C E M E N T
(Inset, Fig. 18)
1. Remove dowel pin, bolt and washer retain­
ing compression cap to trunnion tube. Remove
compression cap.
2. Using a suitable tool, remove rubber bush­
ing from trunnion mount.
3. Thoroughly wet the rubber bushings, trun­
nion mount, and tube with water, then insert rub­
ber bushings into trunnion mount until bushings
seat against spacer located at center of the trun­
nion mount bore. Slide trunnion mount assembly
onto trunnion tube using a rocking motion. Rotate
assembly until dowel pin engages slot in compres­
sion tube. Install dowel pin.
4. Tighten compression cap bolt until exposed
rubber measures 0.045 to 0.125 inches on both
ends.
N O T E : A minimum of 600 foot-pounds torque
should be required to displace the rubber bushings
to dimensions listed above. If less than 600 foot­
pounds torque is required, disassemble and place
rubber spacer rings against the hub spacer ring
and reassemble.
R O C K E R A R M IN S T A L L A T IO N (Fig. 18)
1. Place rocker arm in position at axle brac­
kets. Install adapters at each side of axle brackets
and into rocker arm bushings.
2. At each end of rocker arm, install bolt with
flat washer through axle bracket and rocker arm.
N O T E : Bolt should be installed from inner side
with nut located toward the wheel. Tighten nuts or
bolts to torque listed in "Specifications" at end of
this section.
3. Position spring cap on spring assembly with
head of center bolt in locating hole in spring cap;
then place U-bolts over cross tube bracket and
through spring cap. Install lock washers and nuts
and tighten to torque listed in "Specifications" at
end of this section.
4. Remove support from under vehicle frame.
T O R Q U E ROD S
Information pertaining to torque rod removal
and installation remains the same as covered under
"Torque Rods" at end of "Hendrickson Tandem
Rear Suspension" section previously.
N O T E : Refer to "P R O P E L L E R S H A F T S "(S E C .
4D) for torque rod and drive line angle adjust­
ment.
IMPORTANT
U-bolts must be retightened to initial torque
listed in "Specifications" after 500 miles.
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L