Kia Optima: Suspension System

Kia Optima DL3 2019-2024 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	4.50 kg/cm2 (60psi)

Wheel Alignment

Item	Specification
Item	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

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
Abnormal worned out of tire	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

Front Suspension System

Rear Suspension System

Tires/Wheels

Tire Pressure Monitoring System

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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