Daewoo Nubira. Manual - part 248

SECTION : 2A

SUSPENSION DIAGNOSIS

TABLE OF CONTENTS

DIAGNOSIS

2A–1

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GENERAL DIAGNOSIS

2A–1

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TORQUE STEER

2A–5

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TAPERED ROLLER BEARING

2A–6

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TAPERED ROLLER BEARING (OPTIONAL)

2A–6

. . 

DIAGNOSIS

GENERAL DIAGNOSIS

Problems in the steering, the suspension, the tires, and
the wheels involve several systems. Consider all systems
when diagnosing a complaint. Some problems, such as
abnormal or excessive tire wear and scuffed tires, may be
the result of hard driving. Always road test the vehicle first.

If possible, do this road test with the customer.

Proceed with the following preliminary checks. Correct
any substandard conditions.

Preliminary Checks

Checks

Action

Inspect the tires for improper pressure and uneven wear.

Inflate the tires to the proper pressure.

Inspect the joint from the steering column to the steering
gear for loose connections or wear.

Tighten the intermediate shaft pinch bolts. Replace the in-
termediate shaft as needed.

Inspect the front and the rear suspension, the steering
gear, and the linkage for loose or damaged parts.

Tighten the front and the rear suspension. Tighten the
steering gear mounting bracket bolts. Tighten the coupling
flange pinch bolts. Replace the front and the rear suspen-
sion as needed. Replace the steering gear as needed. Re-
place the intermediate shaft as needed.

Inspect forout–of–round tires.

Perform a free runout test. Match–mount the tires.

Inspect for out–of–balance tires, bent wheels, and worn or
loose wheel bearings.

Balance the wheels. Replace the wheels. Replace the
wheel bearings.

Check the power steering pump serpentine belt tension.

Tighten the power steering pump serpentine belt.

Inspect the power steering system for leaks. Check the
power steering fluid level.

Repair any leaks. Perform a power steering gear test. Add
power steering fluid.

Car Lead/Pull

Checks

Action

Inspect for mismatched or uneven tires.

Replace the tires.

Inspect for a broken or a sagging spring.

Replace the spring.

Inspect for a radial tire lateral force.

Check the wheel alignment. Switch the tire and the wheel
assemblies. Replace the tires, as needed.

Check the front–wheel alignment.

Align the front wheels.

2A – 2

I

SUSPENSION DIAGNOSIS

DAEWOO V–121 BL4

Checks

Action

Inspect foran off–centersteering gear.

Reseat the pinion valve assembly. Replace the pinion
valve assembly, as needed.

Inspect for front–brake dragging.

Adjust the front brakes.

Abnormal or Excessive Tire Wear

Checks

Action

Check the front–wheel and the rear–wheel alignment.

Align the front and the rear wheels.

Inspect for excessive toe on the front and the rear wheels.

Adjust the toe on the front and the rear wheels.

Inspect for a broken or a sagging spring.

Replace the spring.

Inspect for out–of–balance tires.

Balance the tires.

Inspect for worn strut dampeners.

Replace the strut dampeners.

Check for a failure to rotate tires.

 Rotate the tires. Replace the tires, as needed.

Check for an overloaded vehicle.

Maintain the proper load weight.

Inspect for low tire inflation.

Inflate the tires to the proper pressure.

Scuffed Tires

Checks

Action

Inspect for incorrect toe on the front and the rearwheels.

Adjust the toe on the front and the rear wheels.

Inspect fora twisted ora bent suspension arm.

Replace the suspension arm.

Wheel Tramp

Checks

Action

Inspect for an out–of–balance tire or wheel.

Balance the tire or the wheel.

Inspect for improper strut dampener action.

Replace the strut dampeners.

Shimmy, Shake, or Vibration

Checks

Action

Inspect for an out–of–balance tire or wheel.

Balance the tire or the wheel.

Inspect for excessive wheel hub runout.

Measure the hub flange runout. Replace the hub, as need-
ed.

Inspect for excessive brake drum or brake rotor imbal-
ance.

Adjust the brakes. Replace the brake rotoror the brake
drum, as needed.

Inspect for worn tie rod ends.

Replace the outer tie rods.

Inspect for wheel trim imbalance.

Balance thewheel.

Inspect for a worn lower ball joint.

Replace the lowerball joint.

Inspect for excessive wheel runout.

Measure thewheel runout. Replace thewheel, as needed.

Inspect for excessive loaded radial runout on the tire and
the wheel assembly.

Match–mount the tire and thewheel assembly.

Hard Steering

Checks

Action

Check the steering gear preload adjustment.

Perform a rack bearing preload adjustment.

Check the hydraulic system. Test the power steering sys-
tem pressure with a gauge.

Replace the seals and the hoses, as needed.

SUSPENSION DIAGNOSIS  2A – 3

DAEWOO V–121 BL4

Checks

Action

Inspect for binding or catching in the steering gear.

Lubricate the steering gear. Repair or replace the steering
gear, as needed.

Inspect for a loose steering gear mounting.

Tighten the steering gear mounting bracket nuts.

Too Much Play in Steering

Checks

Action

Inspect for worn or loose front wheel bearings.

Tighten the drive axle nut. Replace the wheel bearings as
needed.

Inspect for a loose steering gear mounting.

Tighten the steering gear mounting bracket nuts.

Inspect the joint from the column to the steering gear for
loose connections or wear.

Tighten the intermediate shaft pinch bolts. Replace the in-
termediate shaft, as needed.

Check the steering gear preload adjustment.

Perform a rack bearing preload adjustment.

Poor Returnability

Checks

Action

Inspect for lack of lubrication of the ball joints and the tie
rod ends.

Replace the ball joints and the outer tie rods.

Inspect for binding in the ball joints.

Replace the ball joint.

Inspect for binding in the steering column.

Lubricate the steering column. Replace the steering col-
umn as needed.

Check the front–wheel alignment.

Align the front wheels.

Check the steering gear preload adjustment.

 Perform a rack bearing preload adjustment.

Inspect for a sticking valve.

 Lubricate the pinion valve assembly. Replace the pinion
valve assembly, as needed.

Inspect for binding in the intermediate shaft on the steering
gear.

Replace the intermediate shaft.

Abnormal Noise, Front Suspension

Checks

Action

Inspect for a lack of lubrication of the ball joints and the tie
rod ends.

Replace the ball joints and the outer tie rods.

Inspect for damaged suspension components.

Replace the damaged suspension components.

Inspect for worn control arm bushings or tie rod ends.

Replace the control arm bushings or the tie rods.

Inspect for a loose stabilizer shaft link.

Tighten the stabilizer shaft link.

Inspect for loose wheel bolts.

Tighten the wheel bolts.

Inspect for loose suspension bolts or nuts.

Tighten the suspension bolts or the nuts.

Tighten the wheel covers.

Tighten the wheel covers.

Inspect for worn strut dampeners or strut mountings.

Replace the strut dampeners. Tighten the strut mounting
bolts.

Inspect for an improperly positioned strut spring.

Adjust the strut spring to the proper position.

Wander or Poor Steering Ability

Checks

Action

Inspect for mismatched or uneven tires.

Replace the tires.

Inspect for lack of lubrication of the ball joints and the tie
rod ends.

Replace the ball joints and the outer tie rods.

2A – 4

I

SUSPENSION DIAGNOSIS

DAEWOO V–121 BL4

Checks

Action

Inspect for worn strut dampeners.

Replace the strut dampeners.

Inspect for a loose stabilizer shaft link.

Tighten the stabilizer shaft link.

Inspect for a broken or a sagging spring.

Replace the spring.

Check the steering gear preload adjustment.

 Perform a rack bearing preload adjustment.

Check the front–wheel and the rear–wheel alignment.

Align the front and the rear wheels.

Erratic Steering when Braking

Checks

Action

Inspect for worn or loose front wheel bearings.

 Replace the front wheel bearings.

Inspect for a broken or a sagging spring.

Replace the spring.

Inspect for a leaking wheel cylinder or caliper.

 Replace the wheel cylinder or the caliper.

Inspect for warped rotors.

Replace the rotors.

Inspect for an incorrect or an uneven caster.

If the caster is beyond specifications, check the frame and
repair it, as needed.

Low or Uneven Trim Height

Checks

Action

Inspect for a broken or a sagging spring.

 Replace the spring.

Check for an overloaded vehicle.

Maintain the proper load weight.

Inspect for an incorrect or weak spring.

Replace the spring.

Ride Too Soft

Checks

Action

Inspect for worn strut dampeners.

Replace the strut dampeners.

Inspect for a broken or a sagging spring.

Replace the spring.

Ride Too Harsh

Checks

Action

Inspect for incorrect strut dampeners.

Replace the strut dampeners.

Inspect for an incorrect spring.

Replace the spring.

Body Leans or Sways in Corners

Checks

Action

Inspect for a loose stabilizer shaft link.

Tighten the stabilizer shaft link.

Inspect for worn strut dampeners or strut mountings.

Replace the strut dampeners. Tighten the strut assembly
mounting bolts.

Check for an overloaded vehicle.

Maintain the proper load weight.

Inspect for a broken or a sagging spring.

Replace the spring.

Suspension Bottoms

Checks

Action

Inspect for worn strut dampeners.

Replace the strut dampeners.

Check for an overloaded vehicle.

Maintain the proper load weight.

Inspect for a broken or a sagging spring.

Replace the spring.