Chevrolet 1980 Light Duty Truck Service Manual page 220

3B4-6 STEERING CO LUM NS
IG N IT IO N SYSTEM - ELECTRICAL SYSTEM -
W ILL NOT FU N C TIO N (CONT'D.)
Cause
D. Defective ignition switch.
E. Ignition switch not adjusted properly.
SWITCH W ILL NOT ACTU A TE M EC H A N IC A LLY
Cause
A. Defective ignition switch.
SWITCH CAN NOT BE SET CORRECTLY
Cause
A. Switch actuator rod deformed.
B. S ecto r to rack engaged in w ro n g to o th (ti lt ).
NOISE IN COLUM N
Cause
A. Coupling bolts loose.
B. Column not correctly aligned.
C. Coupling pulled apart.
D. Sheared interm ediate shaft plastic joint.
E. Horn contact ring not lubricated.
F. Lack of grease on bearings or bearing surfaces.
G. Lower shaft bearing tight or frozen.
H. Upper shaft tight or frozen.
I. Shaft lock plate cover loose.
J. Lock plate snap ring not seated.
K. Defective buzzer dog cam on lock cylinder.
L. One click when in " off-lock" position and the steering
wheel is moved.
Fig. 3B 4 -5~ A utom a tic T ransm ission Colum n D iagnosis C hart C
Solution
D. Replace ignition switch.
E. Readjust ignition switch.
Solution
A. Replace igntion switch.
Solution
A. Repair or replace switch actuator rod.
B. Engage sector to rack correctly.
Solution
A. Tighten pinch bolts to specified torque.
B. Realign column.
C. Replace coupling and realign column.
D. Replace or repair steering shaft and realign column.
E. Lubricate with lubriplate.
F. Lubricate bearings.
G. Replace bearing. Check shaft and replace if scored.
H. Replace housing assembly.
I. Tighten three screws or, if missing, replace.
CAUTION: Use specified screws. (1 5 in. lbs.)
J. Replace snap ring. Check for proper seating in groove.
K. Replace lock cylinder.
L. Normal condition - lock bolt is seating.
L IG H T T R U C K S ER V IC E M ANUAL