Chevrolet 1980 Light Duty Truck Service Manual page 288

3C-22 FRONT SUSPENSION
Fig. 3C-32~Suspension Unit to Frame
1. Place steering knuckle in position and insert upper
and lower ball studs into knuckle bosses.
Steering knuckle hole, ball stud and nut should be free
of dirt and grease before tightening nut.
2. Install ball stud
specifications. (See Specification Section.)
If necessary, tighten one more notch to insert cotter
pins. Do not loosen nut to insert cotter pin. Refer to Ball
Joint text for proper nut installation sequence.
3. Reverse remaining removal procedure, and tighten
splash shield mounting bolt. Tighten two caliper assembly
mounting bolts to 48 N -m (35 ft. lbs.) torque.
4. Adjust wheel bearings as outlined under Front
Wheel Bearing Adjustment.
5. Tighten wheel nuts to 100 N-m (75 ft. lbs.).
CRO SSM EM BER AND SUSPENSION UNIT
Component parts of the front suspension may be
serviced separately as outlined in the preceding service
operations. However, if extensive service is to be performed
to crossmember, frame, etc., the unit can be removed and
installed as follows:
nuts and tighten nut to
Removal
(Fig. 3C-32)
1. Raise hood and disconnect negative battery cable
from battery.
2. Raise vehicle on hoist.
3. Remove front wheels.
4. Disconnect front brake hose clip from each upper
control arm.
5. Support front of vehicle with jack stands at frame
side rails. Lower front hoist.
6. Clean area adjacent to brake hose fittings.
Disconnect front brake hoses from calipers. Discard special
washers (2 each hose). Cover disconnected end of each hose
with suitable material.
7. Disconnect tie rod ends from steering knuckles.
Discard cotter pins. Refer to Section 3B.
8. If equipped, disconnect front stabilizer from lower
control arms.
9. Disconnect fron shock absorbers from lower control
arms.
10. Remove brake line clip bolts from front suspension
crossmember. On C-Models the clip is located under right
hand engine mount support bracket.
NOTICE: Failure to disconnect these clips from the
front suspension unit will result in severe damage to
the brake line when unit is lowered from vehicle.
11. Remove engine mount support bracket to front
suspension crossmember bolts.
12. Remove crossmember to lower frame rail bolts.
13. Raise hoist to support front suspension unit.
14. Support engine.
adequately before front suspension unit is lowered from
vehicle.
15. Remove upper control arm bracket to frame side
rail bolts. Suspension unit is now disconnected from vehicle.
16. Lower hoist to lower front suspension unit from
vehicle.
Installation
1. Raise hoist to align new suspension unit with frame
rail holes.
See NOTICE, on page 1 of this section
NOTICE:
regarding fasteners referred to in steps 2-14.
2. Assemble (finger-tight) upper control arm bracket
bolts and crossmember bolts to frame rails.
3. Torque upper control arm bracket bolts to frame
side rails to 90 N-m (65 ft. lbs.). Control arm bracket bolts
must be torqued before crossmember bolts are torqued.
Crossmember must be in contact with siderails.
4. Torque crossmember bolts to frame lower rails 100
ft. lbs. Engine support can be removed at this time.
5. Lower hoist.
6. Assemble (finger-tight) engine mount support
bracket to front suspension crossmember bolts.
7. Torque engine mount support bracket bolts to 48
N-m (35 ft. lbs.).
8. Install brake line clip bolt to front suspension
crossmember. Torque to 17 N-m (150 in. lbs.) (C-models),
12 N-m (100 in. lbs.) (G-models).
Engine must be supported
LIG H T T R U C K S ER V IC E M AN UAL