GMC 1986 P-Truck Service Manual page 242

DIAGNOSIS OF THE STEERING COLUMN (CONT.)
PROBLEM
Lock Cylinder—High
E ffort Between The 2. Distorted rack.
" O ff" and
" O ff-Lock" Positions
Sticks In " S tart"
Position 2. Any high effort condition.
Key Cannot Be
Removed In The 2. Faulty lock cylinder.
" O ff-Lock" Position
The Lock Cylinder
Can Be Removed 2. Burr over the retainer slot in the hous­
W ithout Depressing
The Retainer
Lock Bolt Hits The
Shaft Lock In The
" O ff" And " Park"
Positions
Noise In The Column
2. Column not correctly aligned.
3. One click in Off-Unlock position and
4. Horn contact ring not lubricated.
5. Lack of grease on the bearings or
6. Lower shaft bearing is tight or frozen.
7. Upper shaft bearing is tight or frozen.
8. Lock plate retaining ring is not seated.
9. Steering shaft snap ring is not seated.
10. Shroud or housing is loose.
11. Sheared intermediate shaft plastic
High Steering Shaft
1. Column assembly is misaligned in the
Effort
2. Tight or frozen upper or lower bear­
3. Binding intermediate shaft U-joints.
POSSIBLE CAUSE
1. Burr on tang of shift gate.
1. Actuator rod is deformed.
1. Ignition switch is not set correctly.
1. Faulty retainer.
ing cover.
Ignition switch is not set correctly.
1. Flexible coupling pulled apart.
when the steering wheel is moved.
bearing surface.
joint.
vehicle.
ings.
STEERING COLUMN 3B4-3
CORRECTION
1. Remove the burr.
2. Replace the rack.
1. Straighten or replace the rod.
2. See " correction" under the high ef­
fort diagnosis.
1. Adjust ignition switch.
2. Replace the lock cylinder.
1. Replace the lock cylinder.
2. Remove the burr.
Adjust the ignition switch.
1. Align the column and replace the
flexible coupling.
2. Align the column.
3. Norma! seating of the lock bolt.
4. Lubricate.
5. Lubricate the bearings.
6. Replace the bearing. Inspect the
shaft and replace if scored.
7. Replace the housing assembly.
8. Replace the retaining ring. Inspect
for proper seating in the groove.
9. Replace the snap ring. Inspect for
proper seating in the groove.
10. Tighten mounting screws.
11. Repair or replace the steering shaft.
Align the column.
1. Align correctly.
2. Replace the bearings.
3. Repair or replace the intermediate
shaft.