BMW Vehicle Models i4 2022-present Torque Specifications
BMW Vehicle Models i4 2022-present

BMW Vehicle Models i4 2022-present Torque Specifications

Complete BMW Vehicle Models i4 2022-present 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

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Torque Calculator

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Body

Torque specifications for Body

Exterior Panels

1

Front Bumper Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Ensure proper alignment before tightening.
2

Rear Bumper Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Verify correct bumper alignment.
3

Fender Mounting Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Estimated value. Do not over-tighten to avoid damaging thin metal.
4

Grille Mounting Bolts

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Usually low torque for plastic/light-metal body components. Do not over-tighten.
5

Side Skirt/Rocker Panel Mounting Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Estimated value. Ensure proper alignment before tightening.
6

Headlight Mounting Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated Value. Use care not to crack or stress the headlight housing.
7

Taillight Mounting Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated Value. Use care not to crack or stress the taillight housing.

Door And Hood

1

Door Hinge Bolts

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Estimated value. Ensure proper door alignment and operation.
2

Door Latch Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Estimated value. Correct torque is important for latch functionality and safety.
3

Hood Hinge Bolts

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Estimated value. Ensure proper hood alignment and operation.
4

Hood Latch Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Estimated Value. Correct torque is important for latch functionality and safety.

Interior

1

Seat Mounting Bolts

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Estimated Value. Very important for occupant safety. Use care to ensure all bolts are properly torqued.
2

Dashboard/Instrument Panel Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Estimated value. Prevents squeaks and rattles. Do not overtighten.
3

Interior Trim Panel Bolts/Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5.5 N·m)
Important Notes
Estimated value. Usually lower torque values for plastic or light metal components. Do not over-tighten.

Brakes

Torque specifications for Brakes

Caliper

1

Caliper Mounting Bolts

M12 x 1.75
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Torque to specified value. Ensure bolts are clean and in good condition. Torque in a criss-cross pattern.

Caliper Bracket

1

Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Torque to specified value. These bolts are critical for bracket integrity. Torque in a criss-cross pattern.

Rotor

1

Rotor Retaining Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
These bolts only retain the rotor to the hub, not to secure it, and should not be over-torqued. Torque evenly.

Brake Lines

1

Brake Line Banjo Bolts

M10 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Always refer to specific vehicle manual. New washers are recommended. Do not over-tighten.

Master Cylinder

1

Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure the master cylinder is properly aligned before torquing bolts.

Brake Booster

1

Brake Booster Mounting Bolts/Nuts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Tighten evenly. Ensure booster is flush to firewall.

Brake Pedal

1

Brake Pedal Assembly Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure proper pedal alignment after mounting.

Parking Brake

1

Parking Brake Cable Bracket Bolts

M6 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated value. Do not overtighten as damage can result in the bracket.

Drivetrain

Torque specifications for Drivetrain

Engine Interface

1

Flywheel Bolts

M12 x 1.25
Torque Specification
1. 40 ft-lbs (54 N·m) 2. 60 ft-lbs (81 N·m) 3. 60°
Important Notes
Tighten bolts in a star pattern. Final torque and angle are critical.
2

Flex Plate/Drive Plate Bolts

M10 x 1.25
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 65 ft-lbs (88 N·m)
Important Notes
Tighten bolts in a star pattern.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Specification
95 ft-lbs (129 N·m)
Important Notes
Use new bolt, lubricate threads with clean engine oil. Final torque is critical.

Transmission

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten bolts evenly.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten bolts in a star pattern to ensure even pressure on the gasket.
3

Transmission Drain Plug

M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Use a new crush washer and tighten to specified torque.
4

Transmission Fill Plug

M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Use a new crush washer and tighten to specified torque.

Driveshaft And Axles

1

Drive Axle/Half Shaft Bolts (Transmission Side)

M10 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Tighten bolts evenly. Use new bolts if specified.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
190 ft-lbs (258 N·m)
Important Notes
Use new axle nut and torque to specified value, then stake the nut.
3

Propeller/Drive Shaft Bolts (Transmission Side)

M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Tighten bolts evenly. Ensure proper alignment before final tightening.
4

Propeller/Drive Shaft Bolts (Differential Side)

M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Tighten bolts evenly. Ensure proper alignment before final tightening.
5

Driveshaft Center Support Bearing Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts evenly. Ensure proper alignment before final tightening.

Differential

1

Differential Mounting Bolts

M14 x 2.0
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Tighten bolts evenly.
2

Differential Drain Plug

M16 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Use a new crush washer and tighten to specified torque.
3

Differential Fill Plug

M16 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Use a new crush washer and tighten to specified torque.
4

Rear Axle Flange Bolts/Nuts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten bolts/nuts evenly.

Transfer Case

1

Transfer Case Drain Plug

M16 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Use a new crush washer and tighten to specified torque.
2

Transfer Case Fill Plug

M16 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Use a new crush washer and tighten to specified torque.

Electric Engine

Torque specifications for ELECTRIC Engine

Electric Motor

1

Electric Motor Mounting Bolts (Motor to Chassis/Subframe)

M14 x 2.0
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Tighten bolts in a star pattern to evenly distribute pressure. Estimated value, always refer to official service manual.
2

Electric Motor Stator Housing Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure bolts are tightened in a cross pattern. Estimated value, always refer to official service manual.
3

Electric Motor Rotor End Cap Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten bolts evenly in a circular pattern. Estimated value, always refer to official service manual.

Power Electronics

1

Inverter/Power Electronics Control Unit (PECU) Mounting Bolts (Module to Chassis)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten all bolts to the specified torque. Estimated value, always refer to official service manual.
2

Power Distribution Unit (PDU) Mounting Bolts

M6 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure secure mounting of the PDU. Estimated value, always refer to official service manual.

High Voltage Battery

1

High Voltage Battery Module Mounting Bolts (Individual Modules within Pack)

M6 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Tighten these bolts evenly to avoid uneven pressure on the battery modules. Estimated value, always refer to official service manual.
2

High Voltage Battery Pack Mounting Bolts (Pack to Chassis)

M12 x 1.75
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Tighten bolts in a star pattern. Ensure even distribution of the pack weight. Estimated value, always refer to official service manual.

Cooling System

1

Cooling System Fittings for Electric Motor and Inverter (Coolant Line Bolts/Nuts)

M8 x 1.25
Torque Specification
13 ft-lbs (18 N·m)
Important Notes
Do not overtighten, to prevent cracking fittings. Estimated value, always refer to official service manual.

High Voltage Connectors

1

High Voltage Connector Bolts/Fasteners (On Motor, Battery, Inverter)

M5 x 0.8
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
These are often plastic, use caution to not over-torque. Estimated value, always refer to official service manual.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure proper seating of coil before tightening. Use a criss-cross pattern for multiple coil bolts on same bank.

Starting System

1

Starter Motor Mounting Bolt

M10 x 1.5
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure the starter motor is properly seated against the engine/transmission before tightening.

Charging System

1

Alternator Mounting Bolt

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment of the alternator before tightening. Make sure the alternator is grounded to the engine.

Battery System

1

Battery Terminal Nut

M8 x 1.25
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten. Ensure terminal is fully seated on the battery post before tightening.

Engine Control Unit

1

ECU Mounting Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Do not overtighten. Ensure proper seating of the ECU on its mount before tightening.

Ground Connections

1

Engine Block Ground Strap Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure contact surfaces are clean and free from corrosion before tightening. Apply a small amount of conductive grease to the contact surface.
2

Chassis/Body Ground Strap Bolt

M6 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure contact surfaces are clean and free from corrosion before tightening. Apply a small amount of conductive grease to the contact surface.

Power Distribution

1

Fuse Box/Power Distribution Module Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Do not overtighten. Ensure proper seating of the module before tightening. Be careful not to damage the module.

Sensors

1

Crankshaft/Camshaft Position Sensor Mounting Bolt

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten. These sensors are delicate. Ensure sensor is properly seated before tightening.
2

Coolant Temperature Sensor Mounting Bolt/Screw

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten. Ensure sensor is properly seated and sealing surface is clean before tightening.
3

MAP (Manifold Absolute Pressure) Sensor Mounting Bolt/Screw

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten. Ensure sensor is properly seated and sealing surface is clean before tightening.

Wiring Harness

1

Wiring Harness Connector Mounting Screw

M4 x 0.7
Torque Specification
0.25 ft-lbs (0.34 N·m)
Important Notes
Tighten by hand to resistance then 1/4 turn (90 degrees), or as specified by connector type. Do not overtighten.

Lighting

1

Headlight Assembly Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure proper alignment of assembly before tightening. Do not overtighten.
2

Taillight Assembly Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure proper alignment of assembly before tightening. Do not overtighten.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on typical M8 bolt torque. Ensure proper gasket alignment before tightening.
2

Exhaust Manifold/Header Bolts

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Estimated value based on typical M10 bolt torque. Ensure proper flange alignment before tightening.

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Estimated value based on typical M10 bolt torque. Ensure new gasket is used.

Egr System

1

EGR Valve Mounting Bolts

M8 x 1.25
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Estimated value based on typical M8 bolt torque. Use new gasket.

Oxygen Sensors

1

Oxygen (O2) Sensor Mounting Bolt/Stud

M18 x 1.5
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated value. Many O2 sensors are screwed into place and do not have a mounting bolt. If a bolt is used, this is the general specification. Ensure proper seal and do not over-tighten.

Nox Sensors

1

NOx Sensor Mounting Bolt/Stud

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Estimated value based on typical M6 bolt torque for a sensor. Ensure the mounting surface is clean and free of debris.

Maf Sensor

1

Mass Air Flow (MAF) Sensor Mounting Bolts

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value based on typical M5 bolt torque for plastic parts. Be very careful not to over-tighten.

Differential Pressure Sensors

1

Differential Pressure Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Estimated torque value for a typical M6 bolt on plastic housings. Do not over-tighten.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
These bolts secure the manifold/header to the cylinder head. Apply torque in a star pattern, working from the center bolts outward to evenly distribute clamping force. These bolts should be torqued with a calibrated torque wrench. Always use new gaskets.
2

Exhaust Manifold/Header Mounting Flange Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
These bolts connect the exhaust pipe to the manifold/header. Torque evenly to ensure proper seal. Always use new gaskets.

Exhaust Pipe

1

Exhaust Pipe to Catalytic Converter Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Bolts connecting the exhaust pipe to the catalytic converter. Ensure proper alignment and a new gasket is used.
2

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
These bolts secure the muffler to the exhaust piping. Ensure correct alignment and use a new gasket or sealing ring. May be spring loaded, follow procedure for thread engagement when spring loaded.

Exhaust Hangers

1

Exhaust Hanger Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts attach the exhaust hangers to the chassis. Ensure proper alignment and torque to prevent the exhaust system from sagging. Estimated value, consult specific vehicle documentation for exact specs.

Oxygen Sensors

1

Oxygen Sensor Installation

1/2 inch or 1/4 inch
Torque Specification
32 ft-lbs (43 N·m)
Important Notes
Oxygen sensors must be properly torqued. Under-tightening can cause exhaust leaks while over-tightening can damage the sensor or the threads. This torque value is an estimate for a standard size O2 sensor. Consult specific vehicle documentation for exact specs.

Fuel

Torque specifications for Fuel

Fuel Rail And Injectors

1

Fuel Rail Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Ensure proper alignment before tightening. Tighten bolts in a cross pattern.
2

Fuel Injector Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Verify the correct injector seating before tightening. These bolts can be easily over-torqued.

Fuel Pump And Tank

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure the pump gasket is properly positioned. Tighten evenly to avoid damage.
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Ensure proper tank alignment before tightening. Tighten evenly to prevent strain on tank mounts.
3

Fuel Tank Access Panel Bolts/Screws

M5 x 0.8
Torque Specification
4 ft-lbs (5.5 N·m)
Important Notes
Do not over-tighten; these bolts secure an access panel, not a critical seal.

Fuel Lines And Filtration

1

Fuel Line Fittings (Banjo Bolts, Compression Fittings)

Varies
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value for smaller fittings. Adjust for larger sizes. Always use new sealing washers or o-rings.
2

Fuel Filter Bolt/Nut

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure correct filter orientation before tightening. Tighten to ensure no leaks.

Fuel System Accessories

1

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Ensure correct alignment of the filler neck before tightening.
2

Fuel Pressure Sensor Mounting Bolts

M5 x 0.8
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Do not over tighten these bolts to prevent damage to the sensor.
3

Fuel Vapor Line/Purge Valve Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Ensure proper seating before tightening.
4

Fuel Tank Vent Valve Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Ensure proper sealing to prevent tank pressure issues.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure proper bolt engagement before tightening. Use a criss-cross pattern for even clamping.

Ac Lines

1

A/C Line Fittings

Various (typically M10 x 1.5 to M14 x 1.5 depending on the connection)
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Use new o-rings when reconnecting lines. Over-tightening can damage the fittings and cause leaks.

Ac Condenser

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not over-tighten as this can damage the condenser. Tighten in a criss-cross pattern to ensure even pressure.

Ac Evaporator

1

A/C Evaporator Housing Bolts/Clips

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
These bolts are small and can be easily over-tightened. Use a small, accurate torque wrench. Estimated value.

Hvac Control Panel

1

HVAC Control Panel Mounting Screws/Bolts

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Over-tightening these small screws can damage the dashboard or the panel itself. Estimated value.

Blower Motor

1

Blower Motor Mounting Screws/Bolts

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Ensure the blower motor sits flush against the housing before tightening. Estimated value.

Expansion Valve

1

Expansion Valve Mounting Bolts/Screws

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the valve sits flush with its mating surface. Use new o-rings and a small amount of refrigerant oil. Estimated value.

Receiver Drier

1

Receiver Drier/Accumulator Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the receiver/drier is aligned properly with mounting bracket before tightening. Estimated value.

Temperature Actuators

1

Temperature and Mode Actuator Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Ensure the actuator sits correctly on the mating surface. Over-tightening can damage the plastic housing or gears. Estimated value.

None Transmission

Torque specifications for None Transmission

Engine

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
17.5 ft-lbs (23.75 N·m)
Important Notes
Estimated value, consult service manual for specific torque specification.
2

Main Bearing Bolts

M14 x 1.5
Torque Specification
60 ft-lbs (81.25 N·m)
3

Connecting Rod Nuts

M10 x 1.5
Torque Specification
47.5 ft-lbs (64.38 N·m)
4

Oil Pan Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (14.93 N·m)

Valvetrain

1

Valve Cover Bolts

M6 x 1
Torque Specification
7.5 ft-lbs (10.13 N·m)
2

Rocker Arms/Shafts Bolts

M10 x 1.5
Torque Specification
22.5 ft-lbs (30.56 N·m)
3

Spark Plugs

14mm x 1.25
Torque Specification
17.5 ft-lbs (23.75 N·m)

Suspension

1

Strut/Shock Absorber Mounting Bolts

M12 x 1.5
Torque Specification
55 ft-lbs (74.57 N·m)
2

Control Arm Bolts

M14 x 1.5
Torque Specification
70 ft-lbs (94.85 N·m)

Brakes

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
75 ft-lbs (101.69 N·m)
2

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20.34 N·m)
3

Wheel Lug Nuts

M14 x 1.5
Torque Specification
95 ft-lbs (128.85 N·m)

Suspension

Torque specifications for Suspension

Front Suspension

1

Strut Lower Mounting Bolts

M14 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
These bolts secure the strut to the steering knuckle. Ensure proper torque for suspension stability. Estimated value, confirm with service manual.
2

Strut Upper Mount Bolts (to Body)

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
These bolts secure the upper strut mount to the body of the vehicle. Do not overtighten. Estimated value, confirm with service manual.
3

Control Arm Mounting Bolts (Frame)

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the control arm to the subframe/chassis. Ensure proper torque for suspension alignment and handling characteristics. Estimated value, confirm with service manual.
4

Control Arm Mounting Bolts (Knuckle)

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the control arm to the steering knuckle. Ensure proper torque for suspension alignment and handling characteristics. Estimated value, confirm with service manual.
5

Lower Control Arm Ball Joint Pinch Bolt

M10 x 1.25
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
This bolt secures the lower control arm ball joint to the steering knuckle. Ensure proper torque for joint stability. Estimated value, confirm with service manual.
6

Ball Joint Nut

M16 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
This nut fastens the ball joint to the steering knuckle/control arm. Proper torque is crucial for joint stability. Estimated value, confirm with service manual.
7

Tie Rod End Nut

M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle. Proper torque maintains alignment and minimizes play. Estimated value, confirm with service manual.
8

Sway Bar Link Nut

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These nuts secure the sway bar link to the sway bar and strut/control arm/chassis. Ensure proper function of sway bar. Estimated value, confirm with service manual.

Rear Suspension

1

Rear Control Arm Mounting Bolts (Frame)

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the rear control arm to the vehicle frame/subframe. Ensure proper torque for stability. Estimated value, confirm with service manual.
2

Rear Control Arm Mounting Bolts (Knuckle)

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the rear control arm to the rear knuckle. Ensure proper torque for stability and alignment. Estimated value, confirm with service manual.
3

Rear Toe Arm Mounting Bolts (Frame)

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the rear toe arm to the frame/subframe. Proper torque ensures proper rear wheel alignment. Estimated value, confirm with service manual.
4

Rear Toe Arm Mounting Bolts (Knuckle)

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the rear toe arm to the rear knuckle. Proper torque ensures proper rear wheel alignment. Estimated value, confirm with service manual.

Steering System

1

Steering Rack Mounting Bolts

M12 x 1.75
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
These bolts secure the steering rack to the subframe. Essential for proper steering function. Estimated value, confirm with service manual.

Subframe

1

Front Subframe Mounting Bolts

M14 x 2.0
Torque Specification
1. 50 ft-lbs (68 N·m) 2. 95 ft-lbs (129 N·m) 3. 90°
Important Notes
These bolts secure the front subframe to the vehicle chassis. Use a multi-step torque process to properly preload the bolts. Estimated value, confirm with service manual.
2

Rear Subframe Mounting Bolts

M14 x 2.0
Torque Specification
1. 50 ft-lbs (68 N·m) 2. 95 ft-lbs (129 N·m) 3. 90°
Important Notes
These bolts secure the rear subframe to the vehicle chassis. Use a multi-step torque process to properly preload the bolts. Estimated value, confirm with service manual.

Wheel Hub

1

Wheel Hub/Bearing Mounting Bolts

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
These bolts secure the wheel hub to the steering knuckle/axle carrier. Ensure proper torque for wheel and bearing integrity. Estimated value, confirm with service manual.

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 are the torque specifications for the rear axle bolts on a 2022 BMW i4?

Tighten the bolts to 120 Nm (89 lb-ft) in a star pattern, followed by an additional 90 degrees.

Q2

Can I use an impact wrench to tighten the engine mount bolts?

No. Engine mount bolts must be tightened using a torque wrench to the specified torque of 45 Nm (33 lb-ft).

Q3

What IS the proper way to torque the suspension control arm bolts?

First, tighten the bolts to 60 Nm (44 lb-ft). Then, use a torque angle wrench to tighten the bolts an additional 90 degrees.

Q4

What torque should be applied to the brake caliper bolts on the BMW i4?

The front brake caliper bolts should be tightened to 180 Nm (133 lb-ft), while the rear brake caliper bolts should be tightened to 120 Nm (89 lb-ft).

Q5

How often should the lug nuts on the wheels be torqued?

BMW recommends checking and torquing the lug nuts to 140 Nm (103 lb-ft) every 5,000 miles (8,000 km) or after any wheel or tire service.

Q6

Can I use a socket wrench instead of a torque wrench?

No. Torque wrenches are calibrated to deliver a specific torque value, ensuring proper bolt tightness. Using a socket wrench without a torque wrench can lead to over- or under-tightening.

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 i4.

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

Engine Mount Replacement Procedure

Step-by-step instructions for removing and replacing an engine mount on the BMW i4

  • Safety: Disconnect the negative battery terminal.
  • Locate the engine mount to be replaced.
  • Using a socket wrench, remove the bolts securing the mount.
  • Carefully lift the engine and remove the old mount.
  • Install the new mount and tighten the bolts to the specified torque of 75 Nm.
  • Reconnect the battery terminal and start the engine to verify proper operation.
View full procedure

Suspension System Inspection Procedure

Guidelines for inspecting the suspension components of the BMW i4

  • Safety: Park the vehicle on a level surface and engage the parking brake.
  • Visually inspect the suspension components for any signs of damage or wear, such as cracks, rust, or leaks.
  • Check the tires for proper inflation and tread depth.
  • Using a torque wrench, tighten the suspension bolts to the specified torque according to the BMW i4 service manual.
View full procedure
Technical Service Bulletins

TSB No. SIB 10 18 06

2022-05-20

Technical Service Bulletin regarding a potential issue with incorrect torque values on the i4 rear axle.

2022-2023 BMW i4

Resolution: Instructions for identifying and correcting the affected vehicles, including proper torque specifications.

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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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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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