BMW Vehicle Models M4 2021-present Torque Specifications
BMW Vehicle Models M4 2021-present

BMW Vehicle Models M4 2021-present Torque Specifications

Complete BMW Vehicle Models M4 2021-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

Convert between different torque units

3.0l Engine

Torque specifications for 3.0L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 23 ft-lbs (31 N·m) 2. 90° 3. 90°
Important Notes
Torque-to-yield (TTY) bolts must be replaced after removal. Tighten in a specific sequence (consult OEM manual), and in multiple steps as noted by the torqueSteps.
2

Cylinder Head Studs

M10 x 1.5
Torque Specification
1. 23 ft-lbs (31 N·m) 2. 90° 3. 90°
Important Notes
Torque-to-yield (TTY) studs must be replaced after removal. Tighten in a specific sequence (consult OEM manual), and in multiple steps as noted by the torqueSteps.

Engine Block

1

Main Bearing Bolts

M12 x 1.5
Torque Specification
1. 22 ft-lbs (30 N·m) 2. 70° 3. 70°
Important Notes
Torque in multiple steps, following the specified tightening sequence. Consult OEM manual for specific sequence.
2

Oil Pan Bolts

M6 x 1.0
Torque Specification
13 ft-lbs (18 N·m)
Important Notes
Tighten bolts in a criss-cross pattern. Ensure the sealing surface is clean and the gasket is installed properly.
3

Oil Filter Housing Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten to specified torque, ensure a new gasket is installed.
4

Oil Drain Plug

M12 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Use a new crush washer. Do not overtighten.

Rotating Assembly

1

Connecting Rod Nuts

M9 x 1.0
Torque Specification
1. 18 ft-lbs (24 N·m) 2. 60°
Important Notes
Tighten in multiple steps using a specific torque and angle. Consult OEM manual for specific sequence.
2

Flywheel Bolts

M12 x 1.5
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Use new bolts. Tighten in a star pattern. Bolts are often torque-to-yield and should be replaced.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Specification
1. 75 ft-lbs (102 N·m) 2. 90°
Important Notes
Use new bolt. Tighten using torque and angle method. Consult OEM manual for specific sequence.

Valve Train

1

Valve Cover Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly in a criss-cross pattern. Do not overtighten, as this can damage the valve cover.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten evenly to ensure proper valve actuation.
3

Camshaft Sprocket Bolt

M10 x 1.25
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Ensure correct valve timing before tightening. Consult OEM manual for specific procedure.
4

VANOS Unit Bolts/Sprocket Bolts

M7 x 1.0
Torque Specification
1. 23 ft-lbs (31 N·m) 2. 70°
Important Notes
Torque-to-yield (TTY) bolts must be replaced after removal. Tighten in a specific sequence (consult OEM manual), and in multiple steps as noted by the torqueSteps.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensure proper tensioner operation after tightening. Consult OEM manual for the specific procedure.

Intake System

1

Intake Manifold Bolts

M6 x 1.0
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Tighten in a criss-cross pattern to prevent leaks. Ensure proper gasket seating.
2

Throttle Body Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten. Use a new gasket or O-ring.
3

EGR Valve Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper seal between the EGR valve and the manifold.

Exhaust System

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Tighten bolts evenly to avoid leaks. Use new gaskets.

Fuel System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper seating and alignment of the fuel rail.
2

Fuel Injector Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten, ensure the injector is properly seated.
3

Fuel Injector Rail Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper seating and alignment of the fuel rail.

Cooling System

1

Water Pump Bolts

M6 x 1.0
Torque Specification
13 ft-lbs (18 N·m)
Important Notes
Tighten evenly. Use a new gasket.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten evenly. Do not overtighten.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Use a new gasket, do not overtighten.

Sensors

1

Knock Sensor Bolts

M8 x 1.25
Torque Specification
16 ft-lbs (22 N·m)
Important Notes
Ensure proper sensor contact with the engine block.
2

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten. Ensure the sensor is properly seated.
3

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten. Ensure the sensor is properly seated.
4

Coolant Temperature Sensor

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Do not overtighten. Ensure the sensor is properly seated.

Ignition System

1

Spark Plugs

M14 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure proper seating of the spark plugs. Do not overtighten.
2

Ignition Coil Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Do not overtighten. Secure coil to the valve cover or cylinder head properly.

8hp Transmission

Torque specifications for 8hp Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten all mounting bolts evenly. Use a cross-tightening pattern.

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
13 ft-lbs (18 N·m)
Important Notes
Use a cross-tightening pattern when tightening. Ensure the pan gasket is correctly positioned.

Transmission Plugs

1

Transmission Drain Plug

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Always use a new sealing washer. Do not over-tighten.
2

Transmission Fill Plug

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Always use a new sealing washer. Do not over-tighten.

Bellhousing

1

Bellhousing Bolts

M12 x 1.75
Torque Specification
58 ft-lbs (79 N·m)
Important Notes
Use a cross-tightening pattern. Ensure proper alignment before tightening.

Mechatronics Unit

1

Mechatronics Unit Mounting Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten in a criss-cross pattern. Avoid over-tightening due to sensitive electronics.

Valve Body

1

Valve Body Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten in a cross-tightening sequence. Avoid over-tightening, which could damage the valve body.

Oil Cooler Lines

1

Oil Cooler Line Fittings

Varies, estimate M16 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value, confirm specific fitting size. Use a backup wrench to avoid twisting the lines. Always use new O-rings.

Torque Converter

1

Torque Converter Bolts

M10 x 1.25
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Tighten in a star pattern. Check runout to avoid vibrations.

Body

Torque specifications for Body

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure fuel tank is properly aligned before tightening. Tighten evenly to avoid deformation.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Do not over-tighten to prevent damage to the filler neck or fuel door area. Ensure a proper seal with the filler neck gasket.

Exterior Panels

1

Fender Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Start all bolts by hand. Use care to not over-tighten. Check panel alignment after installation.
2

Hood Hinge Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure hood is properly aligned before fully tightening. A second person may be needed to hold the hood.
3

Trunk/Boot Lid Hinge Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure trunk/boot lid is properly aligned before fully tightening. A second person may be needed to hold the lid.
4

Bumper Mounting Bolts/Nuts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper panel alignment before fully tightening. Start all bolts by hand to prevent cross threading.
5

Side Skirt/Rocker Panel Mounting Bolts/Screws

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Tighten screws evenly to prevent panel distortion. Ensure proper panel alignment and that all clips are properly engaged.

Doors

1

Door Hinge Bolts (Body Side)

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the door is properly aligned before tightening. Do not over-tighten these critical safety components.
2

Door Latch Striker Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Adjust striker position for proper door latch engagement. Check for proper door closure.
3

Door Handle Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Tighten evenly. Do not over-tighten to prevent damage to the handle or door.

Lighting

1

Tail Light Assembly Mounting Bolts

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Do not over-tighten to prevent cracking. Ensure proper panel fitment and alignment.
2

Headlight Assembly Mounting Bolts

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Do not over-tighten to prevent cracking. Ensure proper panel fitment and beam alignment.

Grille

1

Grille Mounting Bolts/Clips

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Many grilles use plastic clips, be careful not to over-tighten. Ensure proper panel fitment.

Windshield Wipers

1

Windshield Wiper Motor Mounting Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure proper alignment of wiper motor before tightening. Check for smooth operation after installation.

Interior Panels

1

Door Panel Mounting Bolts/Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Do not over-tighten to prevent damage to plastic panels. Ensure panel is properly seated.
2

Interior Trim Panel Mounting Bolts/Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Do not over-tighten to prevent damage to plastic panels. Ensure panel is properly seated.
3

Sunroof Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Tighten evenly. Ensure proper alignment to prevent leaks and smooth operation.

License Plate

1

License Plate Mounting Bolts/Screws

M6 x 1.0
Torque Specification
2 ft-lbs (3 N·m)
Important Notes
Tighten by hand. Only needs to be snug to hold the plate.

Seats And Safety

1

Seat Mounting Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Proper torque is critical for safety. Ensure all bolts are properly tightened. Check seat adjustment after tightening.
2

Safety Belt Anchor Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Proper torque is critical for safety. Ensure all bolts are properly tightened. Check belt function after tightening.

Brakes

Torque specifications for Brakes

Caliper Mounting

1

Brake Caliper Bolt

M14 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Torque these bolts to specified value to ensure the caliper is securely mounted to the bracket. Use a cross pattern when tightening to ensure even clamping.
2

Brake Caliper Mounting Bracket Bolt

M16 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Torque these bolts to specified value to ensure the bracket is securely mounted to the wheel hub. Use a cross-pattern when tightening to ensure even clamping.

Rotor Attachment

1

Brake Rotor Retaining Bolt/Screw

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
This small bolt/screw secures the rotor to the hub during assembly and wheel installation. Do not over-tighten. Torque value is an estimate based on similar components.

Wheel Attachment

1

Wheel Lug Nut

M14 x 1.25
Torque Specification
100 ft-lbs (135 N·m)
Important Notes
Torque wheel lug nuts to the specified value using a star pattern to ensure even distribution of clamping force. Critical for rotor seating.

Brake Lines

1

Brake Line Banjo Bolt

M10 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque the banjo bolt carefully. Do not over-tighten, to avoid crushing the copper washers and causing leaks. Torque value is an estimate based on similar components.

Brake Pads

1

Brake Pad Retaining Pin/Bolt

M8 x 1.25
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Tighten the retaining pin/bolt to specified value to ensure the brake pads are secured and can move freely within the caliper. Torque value is an estimate based on similar components.

Bleeding

1

Brake Bleeder Screw

M7 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten the bleeder screw hand-tight, then a slight additional turn with a wrench. Over-tightening may damage the screw or sealing surfaces and cause leaks. Torque value is an estimate based on similar components.
2

Brake Caliper Bleed Valve

M8 x 1.25
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Close the bleed valve hand-tight, then a slight additional turn with a wrench. Over-tightening may damage the valve or sealing surfaces and cause leaks. Torque value is an estimate based on similar components.

Drivetrain

Torque specifications for Drivetrain

Engine To Transmission

1

Flywheel Bolts

M12 x 1.25
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Use new bolts. Apply a light coating of engine oil to the bolt threads. Tighten in a star pattern.
2

Transmission Mounting Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even clamping.

Transmission Housing

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Tighten in a criss-cross pattern. Use a new gasket or sealant.
2

Transmission Fluid Drain Plug

M18 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.
3

Transmission Fluid Fill Plug

M18 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.
4

Transmission Output Shaft Flange Bolt

M12 x 1.5
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Estimated value based on similar applications.

Driveshaft And Axles

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Apply a small amount of anti-seize compound to the bolt threads. Tighten evenly.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
175 ft-lbs (237 N·m)
Important Notes
Ensure the nut is properly seated and is the correct type for your vehicle. Use a torque wrench capable of measuring high torque.
3

Propeller/Drive Shaft Bolts

M10 x 1.25
Torque Specification
53 ft-lbs (72 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even clamping. Apply a small amount of anti-seize compound to the bolt threads.

Differential

1

Differential Housing Mounting Bolts

M12 x 1.75
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even clamping. Estimated value based on similar applications.
2

Differential Drain Plug

M18 x 1.5
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.
3

Differential Fill Plug

M18 x 1.5
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.
4

Rear Axle Flange Bolt

M12 x 1.5
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Estimated value based on similar applications.

Transfer Case

1

Transfer Case Mounting Bolts

M10 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even clamping. Estimated value based on similar applications.
2

Transfer Case Drain Plug

M16 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.
3

Transfer Case Fill Plug

M16 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.

Front Differential

1

Front Differential Mounting Bolts

M12 x 1.75
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even clamping. Estimated value based on similar applications.

Electrical

Torque specifications for Electrical

Ignition System

1

Spark Plug

M14 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Ensure threads are clean and lightly lubricated. Torque is critical for proper heat transfer and electrical contact. Over or under tightening can cause engine misfires, damage or premature failure.
2

Ignition Coil Mounting Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure coil is correctly positioned before tightening bolts. Proper torque maintains ground connection and coil alignment over the spark plug.

Starting System

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
32.5 ft-lbs (44 N·m)
Important Notes
Ensure starter motor is properly aligned with the engine block. Proper torque ensures secure mounting and consistent ground. Improper torque will lead to starting issues.

Charging System

1

Alternator Mounting Bolts

M8 x 1.25
Torque Specification
27.5 ft-lbs (37.5 N·m)
Important Notes
Ensure correct belt tension after mounting. Proper torque is important for alignment, vibration reduction and consistent grounding.

Battery System

1

Battery Terminal Nuts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Over-tightening may damage battery terminals. Apply di-electric grease after connection for corrosion protection. Proper torque ensures good electrical contact and prevents overheating.

Engine Control System

1

Engine Control Unit (ECU) Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
ECU components are sensitive to over-tightening. Proper torque ensures secure mounting and good electrical grounding. This torque is an estimate, verify with factory service manual.
2

Sensor Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Be cautious not to over-tighten the sensor mounting bolts. Ensure the sensor is seated properly. Proper torque ensures proper sensor function and grounding. This torque is an estimate, verify with factory service manual.

Grounding System

1

Ground Strap Bolts to Chassis

M8 x 1.25
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Clean both the ground point on the chassis and the contact point on the ground strap prior to installation. Ensure no corrosion or paint inhibits the connection. Proper torque ensures a secure and low-resistance grounding path. This torque is an estimate, verify with factory service manual.

Body Control System

1

Body Control Module (BCM) Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
BCM components are sensitive to over-tightening. Proper torque ensures secure mounting and good electrical grounding. This torque is an estimate, verify with factory service manual.

Lighting System

1

Headlight Assembly Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure headlight is aligned before tightening. Proper torque is important for secure mounting and alignment. This torque is an estimate, verify with factory service manual.
2

Taillight Assembly Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure taillight is aligned before tightening. Proper torque is important for secure mounting and alignment. This torque is an estimate, verify with factory service manual.

Power Distribution

1

Fuse Box Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure fuse box is seated correctly to prevent damage. Proper torque ensures secure mounting and good ground connection. This torque is an estimate, verify with factory service manual.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold/Headers to Cylinder Head

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even clamping force. Torque value is an estimate based on common M8 bolt applications in exhaust systems.
2

Exhaust Pipe to Exhaust Manifold/Headers

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensure a proper gasket is installed. Torque value is an estimate based on common M10 bolt applications in exhaust systems.
3

Catalytic Converter to Exhaust Pipe

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensure a proper gasket is installed. Torque value is an estimate based on common M10 bolt applications in exhaust systems.

Egr System

1

EGR Valve

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper gasket placement. This is an estimated value based on standard M6 bolt applications.

Fuel System

1

Fuel Injector

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten. Use a new seal or o-ring. This is an estimated value based on standard M6 bolt applications in fuel systems.
2

Fuel Rail

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the fuel rail is properly seated. This is an estimated value based on standard M6 bolt applications in fuel systems.

Sensor Mounting

1

Oxygen (O2) Sensor

M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Use a new crush washer or ensure the existing washer is in good condition. Torque value is an estimate, consult a repair manual for exact specifications if needed.
2

Mass Air Flow (MAF) Sensor Mounting

M5 x 0.8
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Be careful not to overtighten. This is an estimated value based on typical M5 bolt applications.
3

NOx Sensor Mounting

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure sensor is correctly seated. This is an estimated value based on standard M6 bolt applications.
4

Differential Pressure Sensor for DPF Mounting

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure proper hose connections before tightening. This is an estimated value based on standard M6 bolt applications.
5

Evap Purge Valve Mounting

M5 x 0.8
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Ensure proper hose connections. This is an estimated value based on standard M5 bolt applications.

Engine Position Sensors

1

Camshaft Position Sensor Mounting

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure sensor is correctly seated. This is an estimated value based on standard M6 bolt applications.
2

Crankshaft Position Sensor Mounting

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure sensor is correctly seated. This is an estimated value based on standard M6 bolt applications.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Headers to Cylinder Head

M8 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque value is an average of the provided range. Ensure even torque distribution by tightening bolts in a criss-cross pattern.
2

Exhaust Pipe to Exhaust Manifold/Headers

M10 x 1.5
Torque Specification
27.5 ft-lbs (37.3 N·m)
Important Notes
Torque value is an average of the provided range. Ensure even torque distribution by tightening bolts in a criss-cross pattern. Use a new gasket for proper sealing.

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe

M10 x 1.5
Torque Specification
27.5 ft-lbs (37.3 N·m)
Important Notes
Torque value is an average of the provided range. Use a new gasket for proper sealing. Tighten bolts in a criss-cross pattern.

Muffler

1

Muffler to Exhaust Pipe

M10 x 1.5
Torque Specification
27.5 ft-lbs (37.3 N·m)
Important Notes
Torque value is an average of the provided range. Ensure a new gasket is used. Tighten bolts in a criss-cross pattern.

Exhaust Clamps

1

Exhaust Clamp Bolts

M8 x 1.25
Torque Specification
32.5 ft-lbs (44.1 N·m)
Important Notes
Estimated torque value based on typical clamp sizes. Actual values may vary; refer to BMW specific documentation. Ensure even pressure is applied by tightening bolts incrementally in a alternating fashion.

O2 Sensors

1

O2 Sensor Installation

M18 x 1.5
Torque Specification
27.5 ft-lbs (37.3 N·m)
Important Notes
Estimated value based on common O2 sensor sizes. Ensure proper alignment to prevent cross-threading. Using an O2 sensor socket is recommended.

Exhaust Supports

1

Exhaust Support Bracket Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated torque value based on typical bracket sizes and applications. Tighten bolts evenly and avoid over-tightening, which can damage the bracket or mounting points. Actual values may vary. Always confirm with BMW specific documents.

Fuel

Torque specifications for Fuel

Fuel Rail

1

Fuel Rail Mounting Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper alignment of the fuel rail before tightening. Tighten bolts in a crisscross pattern to ensure even pressure.
2

Fuel Injector Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly to avoid damaging injectors. Ensure the injectors are seated correctly before tightening.
3

Fuel Injector Rail Mounting Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
These secure the injector rail, and are critical for correct fuel pressure and preventing leaks. Tighten bolts in a crisscross pattern.

Fuel Pump

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensure the fuel pump is correctly aligned to the fuel tank before tightening. Tighten bolts in a crisscross pattern.
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Tighten bolts evenly to ensure proper tank support. Avoid over-tightening to prevent damage to the straps or tank.
3

Fuel Level Sender Mounting Bolts/Screws

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
These are typically low-torque fasteners, over-tightening can damage the sender unit or tank. Estimated value.
4

Fuel Tank Access Panel/Cover Bolts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
These bolts ensure a proper seal on the access panel. Estimated value.

Fuel Lines

1

Fuel Line Fitting/Banjo Bolt

Varies based on application
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Torque values vary based on size. Confirm specific torque for each size. Estimated value based on common M12 Banjo bolts.
2

Fuel Filter Bolt/Nut

M8 x 1.25
Torque Specification
24 ft-lbs (33 N·m)
Important Notes
Ensure the filter is correctly positioned before tightening. Tighten bolts in a crisscross pattern.
3

Inline Fuel Filter Housing Bolts/Retaining Ring

Varies Based on Housing Type
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque value varies based on the housing type. Ensure proper alignment before tightening. Estimated value.

Fuel Delivery

1

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure the filler neck is properly aligned to the tank or body. Tighten bolts evenly to create a proper seal.
2

High-Pressure Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the HPFP is correctly aligned to the engine. Tighten bolts in a crisscross pattern to ensure even pressure.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Specification
32.5 ft-lbs (44 N·m)
Important Notes
Torque evenly in a criss-cross pattern to ensure even pressure on the compressor mount. Always replace bolts if they show signs of wear.
2

A/C Line Fittings

Varying, typically M10 x 1.0 or M12 x 1.5
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Use a flare nut wrench to avoid rounding the fitting. Always use new O-rings and lubricate with refrigerant oil before assembly. Torque value is an average, refer to a model-specific manual for specific values for line sizes.
3

A/C Receiver Drier Mounting Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure the receiver drier is properly aligned and seated. Do not over-tighten.

Ac Condenser

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Do not over-tighten these bolts, as the condenser core is easily damaged. Use a torque wrench to ensure accurate torque. May be different bolt sizes depending on model.

Hvac Blower

1

HVAC Blower Motor Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
The blower motor housing is typically plastic, so do not over-tighten. Tighten evenly to ensure proper seating and to prevent any vibration. This is an estimated value.

Hvac Evaporator

1

HVAC Evaporator Core Housing Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
The evaporator core housing is typically made of plastic, so do not over-tighten the bolts. Ensure even pressure on the housing to maintain a proper seal. This is an estimated value.

Hvac Controls

1

HVAC Control Module/Unit Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
The control module is sensitive to excessive vibration. Tighten to the specified low torque value to avoid damage to the electronic components and ensure proper grounding. This is an estimated value.
2

Blend Door Actuator Mounting Bolts

M4 x 0.7
Torque Specification
5 ft-lbs (6.8 N·m)
Important Notes
These actuators have small plastic housings that can easily crack if over-tightened. Use a torque wrench and proceed with caution. This is an estimated value.

Suspension

Torque specifications for Suspension

Front Suspension

1

Front Strut Top Mount Nut (To Chassis)

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Ensure the strut is properly seated before tightening. Estimated value based on similar applications.
2

Strut/Shock Absorber Mounting Bolts (Lower)

M12 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Tighten evenly. Estimated value based on similar applications.
3

Front Upper Control Arm Bolt

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure the control arm is seated properly before tightening. Estimated value based on similar applications.
4

Front Lower Control Arm Bolt

M16 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Ensure the control arm is seated properly before tightening. Estimated value based on similar applications.
5

Front Lower Control Arm Ball Joint Pinch Bolt

M12 x 1.75
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Ensure the ball joint is seated correctly. Estimated value based on similar applications.
6

Ball Joint Nut (to Knuckle)

M14 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Use a new nut if possible. Estimated value based on similar applications.
7

Tie Rod End Nut

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Ensure proper alignment before tightening. Estimated value based on similar applications.
8

Sway Bar Link Nut (To Strut/Control Arm)

M10 x 1.25
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Tighten evenly on both sides. Estimated value based on similar applications.

Rear Suspension

1

Rear Upper Control Arm Bolt

M14 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Ensure proper alignment before tightening. Estimated value based on similar applications.
2

Rear Lower Control Arm Bolt

M16 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Ensure proper alignment before tightening. Estimated value based on similar applications.
3

Rear Shock/Strut Lower Mounting Bolt

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Tighten evenly. Estimated value based on similar applications.
4

Sway Bar Link Nut (To Strut/Control Arm)

M10 x 1.25
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Tighten evenly on both sides. Estimated value based on similar applications.

Subframe

1

Rear Subframe Mounting Bolts

M14 x 1.5
Torque Specification
1. 90 ft-lbs (122 N·m) 2. 90°
Important Notes
Tighten bolts in a cross pattern. Apply thread locker if specified in the service manual. Estimated value based on similar applications.

Miscellaneous

1

Wheel Speed Sensor Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Do not over-tighten to avoid damage to the sensor. Estimated value based on similar applications.

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 recommended torque specifications for the cylinder head bolts on a 2021 BMW M4?

The cylinder head bolts on a 2021 BMW M4 should be tightened to a torque of 80 Nm (59 ft-lb) in three stages. Refer to BMW Technical Document S14B20 for detailed instructions.

Q2

What type of torque wrench should I use for critical components on my BMW M4?

BMW recommends using a calibrated digital torque wrench with a range of 20-200 Nm (15-150 ft-lb) for critical components. Ensure the torque wrench IS properly calibrated per BMW Technical Standard 342-0045.

Q3

How do I properly lubricate bolts and threads before applying torque?

Apply BMW Engine Oil Part No. 83 21 2 362 533 to the threads and under the bolt head. Ensure even coverage and wipe away excess lubricant to avoid compromising torque accuracy.

Q4

What are the torque specifications for the spark plugs on a BMW M4 S58 engine?

The spark plugs on a 2021+ BMW M4 S58 engine require a torque of 25 Nm (18 ft-lb). Refer to BMW Repair Manual SI B12 01 18 for detailed installation instructions.

Q5

What IS the proper torque for the oil drain plug on a BMW M4?

The oil drain plug on a 2021 BMW M4 should be tightened to a torque of 25 Nm (18 ft-lb). Use a new washer and apply a small amount of BMW Engine Oil to the washer before installation.

Q6

How often should I check the torque on critical bolts and fasteners on my BMW M4?

BMW recommends checking the torque on critical bolts and fasteners during regular maintenance intervals as specified in the BMW Service Schedule. Refer to your vehicle's owner's manual or consult an authorized BMW technician for specific intervals.

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 m4.

  • 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 Cylinder Head Bolt Tightening Procedure

Technical procedure for tightening the cylinder head bolts on the BMW m4 engine.

  • Clean the cylinder head bolt threads and bolt holes.
  • Lubricate the cylinder head bolts with engine oil.
  • Tighten the cylinder head bolts to 20 Nm (15 ft-lb) in the sequence specified in the service manual.
  • Tighten the cylinder head bolts to 40 Nm (30 ft-lb) in the same sequence.
  • Tighten the cylinder head bolts to 60 Nm (45 ft-lb) in the same sequence.
  • Tighten the cylinder head bolts to 80 Nm (60 ft-lb) in the same sequence.
  • Tighten the cylinder head bolts to 100 Nm (75 ft-lb) in the same sequence.
View full procedure

Suspension Component Torque Specifications

Torque specifications for suspension components on the BMW m4.

  • Control arm bolts: 120 Nm (89 ft-lb)
  • Sway bar end links: 60 Nm (44 ft-lb)
  • Tie rod ends: 50 Nm (37 ft-lb)
  • Strut bolts: 100 Nm (74 ft-lb)
  • Shock absorber bolts: 90 Nm (66 ft-lb)
View full procedure
Technical Service Bulletins

Technical Service Bulletin: Loose Cylinder Head Bolts

2022-05-10

This bulletin addresses a potential issue with loose cylinder head bolts on the BMW m4 engine. It provides instructions for inspecting and tightening the cylinder head bolts to the correct torque specifications.

2021-2022 m4

Resolution: Inspect the cylinder head bolts for proper torque. If any bolts are loose, tighten them to the specified torque of 100 Nm (75 ft-lb) in the sequence specified in the service manual.

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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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