Kia Vehicle Models Optima 2016-2020 Torque Specifications
Kia Vehicle Models Optima 2016-2020

Kia Vehicle Models Optima 2016-2020 Torque Specifications

Complete Kia Vehicle Models Optima 2016-2020 torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. Essential information for proper assembly and maintenance.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

1.6l Engine

Torque specifications for 1.6L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.25
Torque Specification
1. 22 ft-lbs (30 N·m) 2. 27 ft-lbs (37 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.5 ft-lbs (10 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Follow the specified torque sequence to ensure proper bearing alignment.
2

Connecting Rod Nuts

M8 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.

Timing System

1

Camshaft Sprocket Bolt

M12 x 1.25
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Ensure the timing marks are aligned before tightening.
2

Timing Belt Tensioner Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the tensioner is properly aligned before tightening.

Turbocharger System

1

Turbocharger Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the turbocharger is properly aligned before tightening.
2

Turbocharger Oil Feed Line Bolt

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the oil feed line is properly seated before tightening.

1.6l Turbo I4 Engine

Torque specifications for 1.6L-TURBO-I4 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.25
Torque Specification
1. 22 ft-lbs (30 N·m) 2. 27 ft-lbs (37 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.5 ft-lbs (10 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Follow the specified torque sequence to ensure proper bearing alignment.
2

Connecting Rod Nuts

M8 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.

Timing System

1

Camshaft Sprocket Bolt

M12 x 1.25
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Ensure the timing marks are aligned before tightening.
2

Timing Belt Tensioner Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the tensioner is properly aligned before tightening.

Turbocharger System

1

Turbocharger Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the turbocharger is properly aligned before tightening.
2

Turbocharger Oil Feed Line Bolt

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the oil feed line is properly seated before tightening.

2.0l Engine

Torque specifications for 2.0L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.25
Torque Specification
1. 22 ft-lbs (30 N·m) 2. 27 ft-lbs (37 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to prevent warping or gasket failure.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.5 ft-lbs (10 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Ensure the crankshaft is properly aligned before tightening.
2

Connecting Rod Nuts

M8 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the tensioner is properly aligned before tightening.
2

Camshaft Sprocket Bolt

M12 x 1.5
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Ensure the camshaft is properly aligned before tightening.

Turbocharger System

1

Turbocharger Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the turbocharger is properly aligned before tightening.
2

Turbocharger Oil Feed Line Bolts

M6 x 1.0
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Ensure the oil feed line is properly seated before tightening.

2.0l Turbo I4 Engine

Torque specifications for 2.0L-TURBO-I4 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.25
Torque Specification
1. 22 ft-lbs (30 N·m) 2. 27 ft-lbs (37 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to prevent warping or gasket failure.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.5 ft-lbs (10 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Ensure the crankshaft is properly aligned before tightening.
2

Connecting Rod Nuts

M8 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the tensioner is properly aligned before tightening.
2

Camshaft Sprocket Bolt

M12 x 1.5
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Ensure the camshaft is properly aligned before tightening.

Turbocharger System

1

Turbocharger Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the turbocharger is properly aligned before tightening.
2

Turbocharger Oil Feed Line Bolts

M6 x 1.0
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Ensure the oil feed line is properly seated before tightening.

2.4l I4 Engine

Torque specifications for 2.4L-I4 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.25
Torque Specification
1. 22 ft-lbs (30 N·m) 2. 27 ft-lbs (37 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to avoid warping the cylinder head.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7.3 ft-lbs (10 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure proper alignment.
2

Connecting Rod Nuts

M8 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the connecting rod bearings are properly seated before tightening.
3

Flywheel Bolts

M12 x 1.5
Torque Specification
57.5 ft-lbs (78 N·m)
Important Notes
Ensure the flywheel is properly aligned before tightening.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the tensioner is properly aligned before tightening.
2

Camshaft Sprocket Bolt

M10 x 1.25
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Ensure the sprocket is properly aligned before tightening.

Oil System

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
7.3 ft-lbs (10 N·m)
Important Notes
Ensure the oil pan gasket is properly seated before tightening.
2

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensure the drain plug washer is in good condition before tightening.

A6f Transmission

Torque specifications for A6f Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M14 x 1.5
Torque Specification
37.5 ft-lbs (50.8 N·m)
Important Notes
Estimated average value between 35-40 ft-lbs (47-54 Nm).

Transmission Oil System

1

Transmission Oil Pan Bolts

M10 x 1.25
Torque Specification
85 in-lbs (9.6 N·m)
Important Notes
Estimated average value between 80-90 in-lbs (9-10 Nm).
2

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Specification
36 ft-lbs (48.8 N·m)
Important Notes
Estimated average value between 29-43 ft-lbs (39-58 Nm).

Transmission Case and Valve Body

1

Transmission Case Bolts

M16 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated average value between 40-50 ft-lbs (54-68 Nm).
2

Valve Body Bolts

M12 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Estimated average value between 20-25 ft-lbs (27-34 Nm).

Torque Converter and Cooler Lines

1

Torque Converter Bolts

M14 x 1.5
Torque Specification
35 ft-lbs (47.4 N·m)
Important Notes
Estimated average value between 30-40 ft-lbs (41-54 Nm).
2

Transmission Cooler Line Fittings

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated average value between 15-20 ft-lbs (20-27 Nm).

Body

Torque specifications for Body

Suspension and Steering

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on similar components.
2

Control Arm Bolts

M16 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
3

Ball Joint Nut

M12 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
4

Tie Rod End Nut

M10 x 1.5
Torque Specification
39 ft-lbs (53 N·m)
5

Sway Bar Link Nut

M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on similar components.
6

Steering Gear/Rack Bolts

M14 x 1.5
Torque Specification
90 ft-lbs (122 N·m)

Body and Frame

1

Body Mount Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on general industry standards.
2

Fender Bolts

M10 x 1.5
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Estimated value based on general industry standards.
3

Hood Hinge Bolts

M10 x 1.5
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Estimated value based on general industry standards.
4

Trunk Lid Hinge Bolts

M10 x 1.5
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Estimated value based on general industry standards.
5

Door Hinge Bolts

M10 x 1.5
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Estimated value based on general industry standards.

Brakes

Torque specifications for Brakes

Brake Caliper

1

Brake Caliper Bolts

M10 x 1.25
Torque Specification
27.5 ft-lbs (37.5 N·m)
Important Notes
Torque value is an average of the specified range (25-30 ft-lbs / 34-41 Nm).
2

Brake Caliper Mounting Bracket Bolts

M12 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Torque value is an average of the specified range (80-100 ft-lbs / 108-136 Nm).

Brake Rotor

1

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Torque value is an average of the specified range (12-18 ft-lbs / 16-24 Nm).

Brake Hydraulics

1

Brake Hose Banjo Bolt

M10 x 1.0
Torque Specification
19 ft-lbs (26 N·m)
Important Notes
Torque value is an average of the specified range (16-22 ft-lbs / 22-30 Nm).
2

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
15.5 ft-lbs (21 N·m)
Important Notes
Torque value is an average of the specified range (13-18 ft-lbs / 18-24 Nm).

Brake Booster

1

Brake Booster Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque value is an average of the specified range (18-22 ft-lbs / 24-30 Nm).
2

Brake Pedal Assembly Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque value is an average of the specified range (18-22 ft-lbs / 24-30 Nm).

Wheel Assembly

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Torque value is an average of the specified range (80-100 ft-lbs / 108-136 Nm). Always use a star pattern for tightening.

D7f Transmission

Torque specifications for D7f Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M10 x 1.5
Torque Specification
37.5 ft-lbs (50.5 N·m)
Important Notes
Torque value is the midpoint of the specified range (35-40 ft-lbs).

Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
7.5 ft-lbs (10.2 N·m)
Important Notes
Torque value is the midpoint of the specified range (80-90 inch-lbs, converted to ft-lbs and N·m).

Fluid Management

1

Transmission Drain Plug

M14 x 1.5
Torque Specification
36 ft-lbs (48.8 N·m)
Important Notes
Torque value is the midpoint of the specified range (29-43 ft-lbs).
2

Transmission Fill Plug

M14 x 1.5
Torque Specification
36 ft-lbs (48.8 N·m)
Important Notes
Torque value is the midpoint of the specified range (29-43 ft-lbs).

Drivetrain Connection

1

Drive Axle/Half Shaft Bolts

M12 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Torque value is the midpoint of the specified range (80-100 ft-lbs).
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
186.5 ft-lbs (253 N·m)
Important Notes
Torque value is the midpoint of the specified range (159-214 ft-lbs).

Starter Motor

1

Starter Motor Mounting Bolts

M8 x 1.25
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Torque value is the midpoint of the specified range (30-40 ft-lbs).

Flywheel

1

Flywheel Bolts

M10 x 1.25
Torque Specification
57.5 ft-lbs (78 N·m)
Important Notes
Torque value is the midpoint of the specified range (54-61 ft-lbs).

Drivetrain

Torque specifications for Drivetrain

Engine And Transmission Mounting

1

Engine Block to Transmission Bellhousing Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on general industry standards.
2

Transmission Crossmember Bolts

M16 x 1.5
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Estimated value based on general industry standards.
3

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
37.5 ft-lbs (50.8 N·m)

Flywheel And Drive Axle

1

Flywheel Bolts

M12 x 1.5
Torque Specification
57.5 ft-lbs (78 N·m)
2

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
3

CV Joint/Axle Nut

M20 x 1.5
Torque Specification
186.5 ft-lbs (253 N·m)

Differential And Axle Shaft

1

Differential Cover Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Estimated value based on general industry standards.
2

Differential Drain/Fill Plug

M12 x 1.5
Torque Specification
36 ft-lbs (48.8 N·m)
3

Axle Shaft Retaining Bolts

M14 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Estimated value based on general industry standards.

Transmission Oil Pan And Drain Plugs

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
9.5 ft-lbs (12.9 N·m)
2

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Specification
36 ft-lbs (48.8 N·m)

Propeller And Drive Shaft

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Specification
16 ft-lbs (21.7 N·m)

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Bolt

M6 x 1.0
Torque Specification
7.25 ft-lbs (10 N·m)
Important Notes
Torque value is critical to ensure proper electrical connection and prevent misfires.

Starting System

1

Starter Motor Mounting Bolt

M10 x 1.5
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Proper torque ensures the starter motor is securely mounted and aligned.

Charging System

1

Alternator Mounting Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Proper torque ensures the alternator is correctly aligned with the drive belt.

Battery System

1

Battery Terminal Nut

M6 x 1.0
Torque Specification
5.4 ft-lbs (7.5 N·m)
Important Notes
Proper torque ensures a reliable electrical connection and prevents corrosion.

Grounding System

1

Ground Strap Bolt

M8 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value based on similar components. Proper torque ensures reliable grounding.

Electrical Control System

1

Fuse Box Mounting Bolt

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N·m)
Important Notes
Estimated value based on similar components. Proper torque prevents vibration damage.
2

ECU Mounting Bolt

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N·m)
Important Notes
Estimated value based on similar components. Proper torque ensures secure mounting.

Wiring System

1

Wiring Harness Clamp Bolt

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N·m)
Important Notes
Estimated value based on similar components. Proper torque prevents wire chafing.

Emissions Sensors

Torque specifications for Emissions_sensors

EGR System

1

EGR Valve Bolts

M10 x 1.5
Torque Specification
15.5 ft-lbs (21 N·m)
Important Notes
Proper torque ensures a leak-free connection and optimal performance.

Oxygen Sensor System

1

Oxygen Sensor Bolts

M12 x 1.25
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's guidelines.

Exhaust System

1

Exhaust Manifold/Headers Bolts

M14 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Proper torque ensures a leak-free connection and optimal performance.
2

Catalytic Converter to Exhaust Pipe Bolts

M14 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Proper torque ensures a leak-free connection and optimal performance.

NOx Sensor System

1

NOx Sensor Bolts

M12 x 1.25
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's guidelines.

Fuel Injection System

1

Fuel Injector Bolts (emissions-related)

M10 x 1.5
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's guidelines.

Emissions Wiring Harness

1

Emissions-related Wiring Harness Bolts

M6 x 1
Torque Specification
7.5 ft-lbs (10 N·m)
Important Notes
Estimated value, may vary depending on manufacturer's guidelines.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold Headers

1

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensures a tight seal to prevent exhaust leaks.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Proper torque ensures a seal and prevents exhaust gas leaks.

Exhaust Pipe Connections

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensures a tight connection, preventing leaks.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensures a secure fit, preventing leaks.
3

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensures a tight connection, reducing noise.

Exhaust Support Components

1

Exhaust Heat Shield Bolts

M6 x 1.0
Torque Specification
12 ft-lbs (17 N·m)
Important Notes
Estimated value. Ensures secure placement without over-tightening.
2

Exhaust Hanger Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensures secure attachment without over-tightening.
3

Exhaust Flange Bolts

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensures a tight seal and prevents leaks.

Sensors

1

Oxygen Sensor (O2 Sensor)

M12 x 1.75
Torque Specification
35 ft-lbs (48 N·m)
Important Notes
Ensures a secure fit and prevents leaks.

Fuel

Torque specifications for Fuel

Fuel Rail and Injector System

1

Fuel Rail Bolts

M10 x 1.5
Torque Specification
14.5 ft-lbs (19.7 N·m)
Important Notes
Estimated average value from 13-16 ft-lbs range.
2

Fuel Injector Bolts

M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Estimated average value from 13-15 ft-lbs range.
3

Throttle Body-To-Intake Manifold Bolts

M12 x 1.75
Torque Specification
12 ft-lbs (16.3 N·m)
Important Notes
Estimated average value from 10-14 ft-lbs range.

Fuel Pump and Filter System

1

Fuel Pump Mounting Bolts

M14 x 2.0
Torque Specification
25 ft-lbs (33.9 N·m)
Important Notes
Estimated average value from 23-27 ft-lbs range.
2

Fuel Filter Bolt/Nut

M16 x 2.5
Torque Specification
20 ft-lbs (27.1 N·m)
Important Notes
Estimated average value from 18-22 ft-lbs range.

Fuel Pressure Regulator and Line Fittings

1

Fuel Pressure Regulator Mounting Bolts

M10 x 1.5
Torque Specification
12 ft-lbs (16.3 N·m)
Important Notes
Estimated average value from 10-14 ft-lbs range.
2

Fuel Line Fittings

M8 x 1.25
Torque Specification
12 ft-lbs (16.3 N·m)
Important Notes
Estimated average value from 10-14 ft-lbs range.

Fuel Tank and Drain Plug

1

Fuel Tank Drain Plug Bolt

M18 x 2.5
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Estimated average value from 20-25 ft-lbs range.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.25
Torque Specification
35 ft-lbs (47.5 N-m)
Important Notes
Torque value is estimated based on typical A/C compressor bolt sizes. Always follow the manufacturer's recommended sequence.

Ac Lines

1

A/C Line Fittings

M8 x 1.25
Torque Specification
13.5 ft-lbs (18.3 N-m)
Important Notes
Torque value is estimated based on typical A/C line fitting sizes. Ensure fittings are clean and free of debris before tightening.

Evaporator Core

1

Evaporator Core Housing Bolts

M6 x 1.0
Torque Specification
7.5 ft-lbs (10.2 N-m)
Important Notes
Torque value is estimated based on typical housing bolt sizes. Follow the manufacturer's recommended sequence.

Blower Motor

1

Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
7.5 ft-lbs (10.2 N-m)
Important Notes
Torque value is estimated based on typical blower motor bolt sizes. Ensure the motor is properly aligned before tightening.

Heater Core

1

Heater Core Inlet/Outlet Pipe Bolts

M8 x 1.25
Torque Specification
14 ft-lbs (19 N-m)
Important Notes
Torque value is estimated based on typical heater core bolt sizes. Ensure pipes are properly aligned before tightening.

Hvac Case

1

HVAC Case Assembly Bolts

M6 x 1.0
Torque Specification
7.5 ft-lbs (10.2 N-m)
Important Notes
Torque value is estimated based on typical HVAC case bolt sizes. Follow the manufacturer's recommended sequence.

Suspension

Torque specifications for Suspension

Front Suspension

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
2

Control Arm Bolts

M16 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Tighten the control arm bolts in a star pattern to ensure even torque distribution.
3

Ball Joint Nut

M12 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Tighten the ball joint nut in a star pattern to ensure even torque distribution.
4

Tie Rod End Nut

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Tighten the tie rod end nut in a star pattern to ensure even torque distribution.
5

Sway Bar Link Nut

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten the sway bar link nut in a star pattern to ensure even torque distribution.
6

Upper Control Arm Bushing Bolts

M14 x 1.5
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
7

Lower Control Arm Bushing Bolts

M16 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Tighten the lower control arm bushing bolts in a star pattern to ensure even torque distribution.
8

Steering Knuckle Bolts

M18 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Tighten the steering knuckle bolts in a star pattern to ensure even torque distribution.
9

Coil Spring Mounting Bolts

M14 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

What IS the proper torque specification for the lug nuts on my 2018 Kia Optima?

The lug nuts on your 2018 Kia Optima should be torqued to 81-113 ft-lbs (110-153 Nm).

Q2

What IS the recommended torque for the oil drain plug on a 2017 Kia Optima?

The oil drain plug on your 2017 Kia Optima should be torqued to 29-34 ft-lbs (40-46 Nm).

Q3

What torque wrench should I use for my 2020 Kia Optima brake caliper bolts?

You should use a torque wrench with a range of 22-221 ft-lbs (30-300 Nm) to properly torque the brake caliper bolts on your 2020 Kia Optima.

Q4

IS it safe to use an impact wrench for tightening suspension bolts on my 2019 Kia Optima?

No, it IS not recommended to use an impact wrench for tightening suspension bolts on your 2019 Kia Optima. Excessive force from an impact wrench can damage the bolts or threads.

Q5

How often should I check the torque on my Kia Optima's wheel bolts?

It IS recommended to check the torque on your Kia Optima's wheel bolts every 6 months or 6,000 miles, whichever comes first.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Digital Torque Wrench (10-100 Nm)

Essential for tightening fasteners to precise torque specifications, preventing damage and ensuring proper assembly. This range IS suitable for many applications on the Kia Optima.

  • Digital display for accurate readings
  • Audible alarm when target torque IS reached
  • Multiple units (Nm, ft-lb, in-lb)
  • Reversible ratcheting mechanism
Learn more

Torque Stick

An alternative to a digital torque wrench, a torque stick provides a preset torque value when tightening fasteners. Suitable for applications where precise torque IS crucial.

  • Preset torque value engraved on the stick
  • Easy to use, no batteries or calibration required
  • Compact size for accessing tight spaces
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets IS necessary for removing and tightening bolts on the Kia Optima. Choose a set with a range of sizes to cover most applications.

  • Durable chrome vanadium steel construction
  • Variety of socket sizes to accommodate various bolt heads
  • Organizer case for easy storage and transportation
Learn more

Safety Glasses

Protecting your eyes IS crucial when working on vehicles. Safety glasses prevent debris or metal shards from entering your eyes.

  • Shatterproof polycarbonate lenses
  • Lightweight and comfortable to wear
  • Meets ANSI Z87.1 safety standards
Learn more
Service Procedures

Engine Bolt Torque Specifications

Follow these torque specifications when tightening bolts related to the engine components, including the cylinder head, intake manifold, and more.

  • Refer to the vehicle's service manual for specific torque values for each bolt location.
  • Clean all bolts and threads before applying torque.
  • Use a torque wrench to ensure proper tightening.
  • Re-tighten bolts to the specified torque after the engine has cooled down.
View full procedure

Suspension Bolt Torque Specifications

Tightening suspension bolts to the correct torque IS crucial for maintaining proper alignment and handling. Follow these specifications when working on suspension components.

  • Locate the torque specifications for the specific suspension component you are working on.
  • Clean all bolts and threads before applying torque.
  • Use a torque wrench to tighten the bolts to the specified value.
  • Double-check the tightness of the bolts after completing the repair.
View full procedure

Brake Bolt Torque Specifications

Properly torquing brake bolts IS essential for ensuring the safety and effectiveness of your vehicle's braking system. Refer to these specifications when performing brake repairs.

  • Identify the correct torque specifications for the brake component you are working on.
  • Clean all bolts and threads before applying torque.
  • Use a torque wrench to tighten the bolts to the specified value.
  • Double-check the tightness of the bolts after completing the repair.
View full procedure

Wheel Bolt Torque Specifications

Properly tightening wheel bolts ensures the safety and stability of your vehicle. Follow these torque specifications when installing or removing wheels.

  • Refer to the vehicle's service manual for the specified torque value for your wheel size and type.
  • Clean all bolts and threads before applying torque.
  • Use a torque wrench to tighten the bolts to the specified value.
  • Double-check the tightness of the bolts after completing the installation.
View full procedure
Technical Service Bulletins

2016-2020 Kia Optima: Engine Bolt Torque Specification Update

2023-03-14

This technical bulletin provides updated torque specifications for certain engine bolts on 2016-2020 Kia Optima vehicles. Failure to use the correct torque could lead to engine damage.

2016-2020 Kia Optima

Resolution: Refer to the technical bulletin for the updated torque specifications and follow the service procedures outlined in the bulletin.

2016-2020 Kia Optima: Suspension Bolt Torque Specification Error

2022-08-01

This technical bulletin corrects an error in the suspension bolt torque specifications for 2016-2020 Kia Optima vehicles. Using the incorrect torque could affect suspension performance and safety.

2016-2020 Kia Optima

Resolution: Refer to the technical bulletin for the corrected torque specifications and follow the service procedures outlined in the bulletin.

2016-2020 Kia Optima: Brake Caliper Bolt Torque Specification Update

2021-12-15

This technical bulletin provides updated torque specifications for the brake caliper bolts on 2016-2020 Kia Optima vehicles. Incorrectly torqued caliper bolts could lead to brake system failure.

2016-2020 Kia Optima

Resolution: Refer to the technical bulletin for the updated torque specifications and follow the service procedures outlined in the bulletin.

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The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
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We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
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About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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