Kia Optima: Suspension System

Kia Optima DL3 2019-2020 Service and Repair Manual / Suspension System

Service data
Service Data

Front Suspension

Item
Specification
Suspension type
Macpherson Strut
Shock absorber type
Gas

Rear Suspension

Item
Specification
Suspension type
Multi link
Shock absorber type
Gas

Wheel & Tire

Item
Specification
Steel wheel
6.5J * 16
Aluminum wheel
6.5J * 16
7.0J * 17
7.5J * 18
Tire
205/65 R16
215/60 R16
215/55 R17
235/45 R18
T125/80 D16
T135/80 D17
Tire Pressure
205/65 R16
2.50 kg/cm2 (35psi)
215/60 R16
215/55 R17
235/45 R18
T125/80 D16
4.50 kg/cm2 (60psi)
T135/80 D17

Wheel Alignment

Item
Specification
Front
Rear
Toe-in (Total)
0.12°±0.2°
0.17°±0.2°
Toe-in (Individual)
0.06°±0.1°
0.085°±0.1°
Camber angle
-0.5°±0.5°
-1.0°±0.5°
Caster angle
5.0°±0.5°
-
King-pin angle
14.5°±0.5°
-

Tightening torque
Tightening Torque

Front Suspension

Item
N·m
kgf·m
lb·ft
Tire wheel hub nut
107.9 - 127.5
11.0 - 13.0
79.6 - 94.0
Front strut upper mounting nuts
53.9 - 73.5
5.5 - 7.5
39.8 - 54.2
Brake hose bracket bolt
8.8 - 13.7
0.9 - 1.4
6.5 - 10.1
Stabilizer bar link to strut assembly
98.1 - 117.7
10.0 - 12.0
72.3 - 86.8
Strut assembly to knuckle
196.1 - 215.7
20.0 - 22.0
144.7 - 159.1
Strut assembly self locking nut
107.9 - 117.7
11.0 - 12.0
79.6 - 86.8
Lower arm to sub frame
156.9 - 176.5
16.0 - 18.0
115.7 - 130.2
Stabilizer bar to stabilizer bar link
98.1 - 117.7
10.0 - 12.0
72.3 - 86.8
Stabilizer bar bracket mounting bolts
49.0 - 63.7
5.0 - 6.5
36.2 - 47.0
Universal joint to pinion of steering gear
49.0 - 58.8
5.0 - 6.0
36.2 - 43.4
Roll rod bracket to sub frame
49.0 - 63.7
5.0 - 6.5
36.2 - 47.0
Roll rod bracket to body
107.9 - 127.5
11.0 - 13.0
79.6 - 94.0
Sub frame staybolts
44.1 - 58.8
4.5 - 6.0
32.5 - 43.4
Sub frame mounting bolt and nut
176.5 - 196.1
18.0 - 20.0
130.2 - 144.7
Steering ger box heat protector bolts
7.8 - 11.7
0.8 - 1.2
5.7 - 8.6
Steering gear box to sub frame
107.9 - 127.5
11.0 - 13.0
79.6 - 94.0
Sub frame to dynamic damper
44.1 - 53.9
4.5 - 5.5
32.5 - 39.8

Rear Suspension

Item
N·m
kgf·m
lb·ft
Tire wheel hub nut
107.9 - 127.5
11.0 - 13.0
79.6 - 94.0
Shock absorber to body
49.0 - 63.7
5.0 - 6.5
36.2 - 47.0
Shock absorber to lower arm
137.3 - 156.9
14.0 -16.0
101.3 - 115.7
Rear shock absorber lock nut
19.6 - 24.5
2.0 - 2.5
14.4 - 18.0
Lower arm to knuckle
137.3 - 156.9
14.0 -16.0
101.3 - 115.7
Stabilizer link to lower arm
58.8 - 68.6
6.0 - 7.0
43.4 - 50.6
Upper arm to knuckle
137.3 - 156.9
14.0 -16.0
101.3 - 115.7
Lower arm to sub frame
107.8 - 117.6
11.0 - 12.0
79.5 - 86.8
Assist arm to sub frame
107.8 - 117.6
11.0 - 12.0
79.5 - 86.8
Assist arm to knuckle
137.3 - 156.9
14.0 - 16.0
101.3 - 115.7
Trailing arm to knuckle
98.1 - 117.7
10.0 - 12.0
72.3 - 86.8
Wheel spped sensor bracket bolts
8.8 - 13.7
0.9 - 1.4
6.5 - 10.1
Trailing arm to body
117.7 - 137.3
12.0 - 14.0
86.8 - 101.3
Stabilizer bar to sub frame
44.1 - 53.9
4.5 - 5.5
32.5 - 39.8
Body to sub frame mounting bolts and nuts
176.5 - 196.1
18.0 - 20.0
130.2 - 144.7
Rear sub frame steering
44.1 - 58.8
4.5 - 6.0
32.5 - 43.4

Special service tools
Special Service Tools

Tool Name / Number
Illustration
Description
Ball joint puller
09568-2J100

Use for removal of ball joint
Lower arm ball joint remover
0K545-A9100

Used for removal of front lower arm ball joint
Front strut lock nut removal tool
0K546-F6100

Used for removal and installation of front strut lock nut
Shock absorber lock nut removal tool
09546-3X100

Used for removal and installation the rear shock absorber lock nut

Troubleshooting
Troubleshooting

Symptom
Expected cause
Countermeasure
Heavy weight feeling on steering wheel
Faulty on front wheel alignment
Adjust or repair
Over rotation resistance of lower arm ball joint
Replace
Over rotation resistance of strut bearing
Replace
Too low amount of Tire air pressure
Adjust
Steering wheel recovery trouble
Faulty on front wheel alignment
Adjust or repair
Noise or ride comfort trouble
Faulty on wheel alignment
Adjust or repair
Inappropriated tire air pressure
Adjust
Faulty function of shock absorber
Replace
Damaged coil spring
Replace
Damaged stabilizer
Replace
Damaged lower arm bushing
Replace
Stabilizer link fixing nut got loosen
Retighten
Damaged stabilizer link (dust cover tearing, ring broke away)
Replace
Abnormal worned out of tire
Faulty wheel alignment
Adjust or repair
Inappropriated tire air pressure
Adjust
Unstable steering wheel
Front wheel alignment trouble
Adjust or repair
Lower arm ball joint turning resistance is too small
Replace
Damaged lower arm bushing
Replace
Vehicle pushed aside phenomenon
Wheel alignment trouble
Adjust or repair
Unbalance of right/left tire
Adjust or replace
Damaged or transformed lower arm bushing
Replace
Damaged coil spring
Replace
Steering wheel juddering
Front wheel alignment trouble
Adjust or repair
Wheel balance trouble
Adjust or repair
Lower are ball joint turning resistance is too much or too small
Replace
Damaged stabilizer
Replace
Damaged lower arm bushing
Replace
Shock absorber operating trouble
Replace
Coil spring trouble
Replace

Strange sound type from under body by parts

Conditions for occurrence
Strange sound on uneven ground
Parts
Step bar link
Step bar bushing
Lower arm ball joint
Strut insulator
Trouble area

Type of strange sound
Rattling, Creaking noise
Squeaking noise
Clunking, Knocking noise
Clicking, Creaking noise
Occurring area
Under part
Under part
Under part
Upper part
Driving speed
20 - 40 ㎞/h (12.4 - 24.9 m/h)
While low speed driving (20 - 40 ㎞/h (12.4 - 24.9 m/h))
20 - 40 ㎞/h (12.4 - 24.9 m/h)
-
Condition of road
Uneven road / bump
Uneven road / bump
Uneven road / bump
Uneven road / tough road
Reason
Loosen / leakage (teared down) / corrosion
Separation of bar and bushing / slip
Loosen / leakage (teared down) / corrosion
Tightened (decrease torque) and interference

Conditions for occurrence
Strange sound while going through uneven road / tough road
Parts
Strut / Shock absorber
Strut / Shock absorber
Strut / Shock absorber
Strut / Shock absorber
Trouble area

Type of strange sound
Rubbing noise
Clicking, Creaking noise
Rubbing noise
Clicking noise
Occurring area
Upper part
Upper part
Upper part (rear)
Upper part (rear)
Driving speed
15 - 25 ㎞/h (9.3 - 15.5 m/h)
15 - 25 ㎞/h (9.3 - 15.5 m/h)
15 - 40 ㎞/h (9.3 - 24.9 m/h)
30 - 50 ㎞/h (18.6 - 31.1 m/h)
Condition of road
Uneven road
Uneven road
Uneven road and tough road
Tough road
Reason
Friction sound from piston load and bumper rubber inner side
Rolled down bumper rubber
(tapping sound of bumper rubber upper part and insulator under part)
Adhesion trouble of upper bracket rubber
Suspension tuning trouble
(damping force, rubber characteristic)

Conditions for occurrence
Strange sound on uneven road
Strange sound while steering
Strange sound while driving
Parts
Lower arm "G" bushing
Cross member bushing
Strut bearing
Wheel / Hub bearing
Trouble area

Type of strange sound
Rubbing noise
Clicking noise
Clicking noise
Roaring noise
Occurring area
Under part
Under part
Upper part
Lower and side part
Driving speed
10 - 40 ㎞/h (6.2 - 24.9 m/h)
-
-
20 - 60 ㎞/h (12.4 - 37.3 m/h)
Condition of road
Bump / tough road
Even road
Even road
Even road
Reason
Dropped off / fallen off
Dropped off / fallen off
Grease leakage
Damaged from outer impact, foreign substance inflow

Wheel and tire diagnosis

Wheel /tire noise, vibration and harshness concerns are directly related to vehicle speed and are not generally affected by acceleration, coasting or deceleration. Also, out-of-balance wheel and tires can vibrate at more than one speed. A vibration that is affected by the engine rpm, or is eliminated by placing the transmission in Neutral is not related to the tire and wheel. As a general rule, tire and wheel vibrations felt in the steering wheel are related to the front tire and wheel assemblies. Vibrations felt in the seat or floor are related to the rear tire and wheel assemblies. This can initially isolate a concern to the front or rear.

Careful attention must be paid to the tire and wheels. There are several symptoms that can be caused by damaged or worn tire and wheel. Perform a careful visual inspection of the tires and wheel assemblies. Spin the tires slowly and watch for signs of lateral or radial runout. Refer to the tire wear chart to determine the tire wear conditions and actions

Wheel and tire diagnosis
Rapid wear at the center
Rapid wear at both shoulders
Wear at one shoulder

Center-tread down to fabric due to excessively over inflated tires

Lack of rotation

Excessive toe on drive wheels

Heavy acceleration on drive

Under-inflated tires

Worn suspension components

Excessive cornering speeds

Lack of rotation

Toe adjustment out of specification

Camber out of specification

Damaged strut

Damaged lower arm

Partial wear
Feathered edge
Wear pattern

Caused by irregular burrs on brake drums

Toe adjustment out of specification

Damaged or worn tie rods

Damaged knuckle

Excessive toe on non-drive wheels

Lack of rotation


Joint Assembly (Wheel side)
Components and components location Components 1. Wheel side joint assembly 2. Wheel side circlip 3. Wheel side boot band 4. Wheel side boott 5. Shaft ...

Front Suspension System
Components and components location Components 1. Strut complete 2. Roll rod bracket 3. Sub frame 4. Stabilizer bar 5. Steering gear box 6. Dynamic da ...

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