BMW Vehicle Models M8 2019-present Torque Specifications
BMW Vehicle Models M8 2019-present

BMW Vehicle Models M8 2019-present Torque Specifications

Complete BMW Vehicle Models M8 2019-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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Search by component name, bolt size, or description

Torque Calculator

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4.4l Engine

Torque specifications for 4.4L Engine

Cylinder Head

1

Cylinder Head Bolts

M12 x 1.75
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 90° 3. 90°
Important Notes
Multi-step torque procedure is critical. The provided values are for the first torque step. Follow OEM procedure for final angle tightening.
2

Cylinder Head Cover Bolts/Nuts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Often aluminum or magnesium, torque carefully. Not to be confused with valve cover.
3

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly seated before tightening.
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper rocker arm/shaft alignment during installation.
5

Spark Plugs

M14 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use anti-seize compound on spark plug threads if recommended by the manufacturer

Engine Block

1

Main Bearing Bolts

M12 x 1.5
Torque Specification
1. 70 ft-lbs (95 N·m) 2. 60°
Important Notes
Multi-step torque procedure with angle tightening. Use new bolts if specified. First torque step provided.
2

Connecting Rod Nuts

M9 x 1.0
Torque Specification
1. 15 ft-lbs (20 N·m) 2. 45°
Important Notes
Multi-step torque procedure including angle. The torque provided is for the first step. Use new nuts if specified.
3

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly aligned with the crankshaft
4

Knock Sensor Bolt

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Torque properly for accurate sensor function.
5

Oil Pump Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper oil pump alignment during installation.
6

Oil Filter Housing Bolt

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper gasket or o-ring seal during installation.
7

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use new crush washer if specified. Do not overtighten.
8

Oil Pan Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket or sealant is used.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper tensioner alignment and operation.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper camshaft timing and sprocket seating.
3

Timing Cover Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket or sealant is used when securing.

External Components

1

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Specification
120 ft-lbs (163 N·m)
Important Notes
Use proper tool to hold crankshaft stationary during tightening.
2

Throttle Body Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper throttle body alignment and gasket is in good condition.
3

Intake Manifold Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper gasket or sealant is used. Tighten in a crisscross pattern.
4

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper gasket or sealant is used, tighten evenly.
5

EGR Valve Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper gasket or sealant is used.
6

Fuel Rail Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure fuel rail is properly seated and aligned.
7

Fuel Injector Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper fuel injector alignment and seating.
8

Fuel Injector Rail Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper alignment and seating.
9

Ignition Coil Bolt

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper coil seating and alignment.

Cooling System

1

Water Pump Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper gasket or sealant is used.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure pulley is properly aligned on the water pump shaft.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper thermostat and gasket installation.
4

Coolant Temperature Sensor Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly seated with a sealing washer if present.

Mounts

1

Engine Mount Bolts

M12 x 1.75
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
May have rubber or hydraulic damping, ensure proper torque.

8hp Transmission

Torque specifications for 8hp Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Use new bolts. Ensure mounting surfaces are clean and free of debris.

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts in a cross pattern. Over-torquing can warp the pan. Use a new gasket if necessary.

Transmission Drain Fill Plugs

1

Transmission Drain Plug

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

Driveshaft Bolts

1

Propeller Shaft Bolts

M10 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Use new bolts and tighten in a cross pattern. Ensure driveshaft is properly aligned.

Mechatronic Unit

1

Mechatronic Unit Mounting Bolts

M6 x 1.0
Torque Specification
1. 6 ft-lbs (8 N·m) 2. 90°
Important Notes
Use new bolts. Tighten to initial torque then turn 90 degrees. Do not over-tighten.

Valve Body

1

Valve Body Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a cross pattern. Ensure valve body is properly aligned.

Oil Cooler Lines

1

Oil Cooler Line Fittings

M14 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated torque. Check specific fitting specs if available. Use new sealing washers/o-rings as required. Do not over-tighten.
2

Oil Cooler Line Fittings

M12 x 1.5
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Estimated torque. Check specific fitting specs if available. Use new sealing washers/o-rings as required. Do not over-tighten.

Output Shaft Flange

1

Output Shaft Flange Bolt

M16 x 1.5
Torque Specification
1. 60 ft-lbs (81 N·m) 2. 90°
Important Notes
Estimated torque. Use new bolt. Tighten to initial torque then turn 90 degrees.

Body

Torque specifications for Body

Door System

1

Door Hinge Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper door alignment before tightening. Apply thread-locker where specified by the manufacturer. Torque in a cross pattern to ensure equal tightening.
2

Door Latch Mounting Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Check latch alignment and operation after tightening. These bolts typically thread into the door structure or a latch reinforcement plate.

Fender System

1

Fender Mounting Bolts

M6 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure proper fender alignment before fully tightening the bolts. These bolts often thread into captive nuts or weld nuts on the vehicle frame. Check for any panel misalignment after tightening.

Bumper System

1

Bumper Cover Mounting Bolts/Fasteners

M6 x 1.0 or self-tapping
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Be careful not to overtighten as these often use plastic retainers or self-tapping fasteners. Hand-tighten in most cases and verify that plastic mounting points are not overstressed.

Hood System

1

Hood Hinge Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper hood alignment before tightening. Apply thread-locker if required. Torque in a cross pattern to ensure even tightening.
2

Hood Latch Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Verify latch alignment and smooth operation. Check the operation of the primary and secondary latch systems after tightening.

Trunk System

1

Trunk/Boot Lid Hinge Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Check trunk lid alignment before fully tightening. Apply thread-locker where specified by the manufacturer. Tighten in a cross pattern for even clamping.
2

Trunk/Boot Latch Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure latch operation is correct after tightening, and verify proper sealing of the trunk.

Seat System

1

Seat Mounting Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Use new bolts if the old ones show signs of wear, or if torque-to-yield type. Always follow manufacturer torque specification. Tighten in a cross pattern for even clamping.

Interior Trim

1

Interior Trim Mounting Bolts/Screws

M4-M6 or Self-Tapping
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Torque varies widely based on the specific fastener size and material. Avoid overtightening as this can damage trim. Many are self-tapping screws. Hand tighten with care.

Brakes

Torque specifications for Brakes

Caliper Assembly

1

Brake Caliper Mounting Bolts

M12 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Secures the brake caliper to the caliper mounting bracket or hub/knuckle. Critical torque for clamping force and preventing loosening.
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
120 ft-lbs (163 N·m)
Important Notes
Attaches the caliper mounting bracket to the vehicle's hub/knuckle. Ensures secure anchoring of the braking assembly.
3

Brake Pad Guide Pin Bolts/Retaining Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Secures the brake pads to the caliper or caliper bracket. Ensures proper pad movement and even force distribution. Some designs may use pins instead of bolts.
4

Brake Hose to Caliper Banjo Bolt

M10 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Secures the brake hose to the caliper using a banjo fitting. Critical for a leak-free seal and proper fluid delivery.

Rotor And Wheel Hub

1

Brake Disc/Drum Retaining Bolts

M6 x 1.0
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Holds the brake disc or drum to the wheel hub, ensuring concentric rotation. These are usually small bolts used during rotor installation, and to hold rotor while installing wheels and calipers.

Brake Lines And Brackets

1

Brake Hose Bracket Bolt

M6 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Secures the brake line to the vehicle's chassis, preventing rubbing or damage from vibrations. Ensure line is correctly positioned and not binding

Master Cylinder And Booster

1

Brake Master Cylinder to Booster Mounting Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the brake master cylinder to the brake booster. Proper alignment and secure fastening are crucial for effective braking.
2

Brake Booster to Firewall/Mounting Bracket Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Secures the brake booster to the vehicle's firewall or mounting bracket. Necessary for correct brake pedal leverage and boosting.

Abs Components

1

ABS Sensor Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (10.8 N·m)
Important Notes
Secures the ABS sensor to the hub. Essential for ABS system functionality. Improper torque can cause misalignment and issues with the ABS system.

Drivetrain

Torque specifications for Drivetrain

Engine To Transmission

1

Flywheel Bolts

M12 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Use new bolts. Ensure threads are clean and lightly lubricated.
2

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Ensure proper alignment before tightening.
3

Transmission Output Shaft Flange Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value. Verify with specific manual.

Transmission

1

Transmission Oil Pan Bolts

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

Transmission Drain and Fill Plugs

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

Driveshaft

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Ensure proper driveshaft alignment. Use new bolts if specified.
2

Driveshaft Center Support Bearing Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Verify with specific manual.

Differential

1

Differential Mounting Bolts

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Estimated value. Verify with specific manual. Tighten to chassis or subframe.
2

Differential Drain/Fill Plug

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Use new sealing washers. Do not over tighten
3

Differential Output Flange Bolts

M10 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Estimated value. Verify with specific manual.

Axles

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Use new bolts. Ensure proper alignment.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
200 ft-lbs (271 N·m)
Important Notes
Use new nut. Ensure proper seating of the axle.

Transfer Case

1

Transfer Case Drain/Fill Plug

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

Electrical

Torque specifications for Electrical

Ignition System

1

Spark Plugs

M14 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure spark plug threads are clean and lubricated with anti-seize compound. Torque to specification to ensure proper heat transfer and sealing.
2

Ignition Coil Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten these bolts, as they secure the coil to the valve cover or cylinder head and can strip easily. Ensure proper seating of the coil.

Starting System

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure proper alignment of the starter motor before tightening the bolts. These bolts should be tightened evenly to prevent misalignment.

Charging System

1

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Ensure proper belt alignment after installing the alternator. Do not over-tighten the bolts to prevent damage to the mounting brackets.

Battery System

1

Battery Terminal Nuts

M8 x 1.25
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Clean terminals and apply anti-corrosion spray. Do not overtighten, as the terminals are sensitive. Estimated value.
2

Battery Hold-Down Bolt/Nut

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secure the battery firmly without excessive force. Ensure that the battery is properly positioned to avoid any movement during operation. Estimated value.
3

Ground Strap Mounting Bolts/Nuts (M6)

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure ground strap connection points are clean and free of corrosion. Tighten securely to ensure good electrical contact. Estimated value.
4

Ground Strap Mounting Bolts/Nuts (M8)

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure ground strap connection points are clean and free of corrosion. Tighten securely to ensure good electrical contact. Estimated value.

Ecu System

1

ECU Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Handle ECU mounting bolts with care. Do not overtighten. Estimated value.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold/Headers to Cylinder Head Bolts

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

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of the manifolds. Use a new gasket if applicable.
3

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of the exhaust pipe. Use new gaskets if applicable.
4

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of the catalytic converter. Use new gaskets if applicable.
5

Oxygen Sensor (O2 Sensor) Mounting

M18 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Apply anti-seize compound to sensor threads. Do not overtighten.
6

NOx Sensor Mounting

M18 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Apply anti-seize compound to sensor threads. Do not overtighten.
7

Differential Pressure Sensor Mounting

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment. Do not overtighten.

Egr System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper alignment of the EGR valve. Use a new gasket if applicable.

Intake System

1

Mass Air Flow (MAF) Sensor Mounting Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten. Ensure the sensor is seated correctly.

Turbocharger System

1

Turbo Wastegate Control Sensor/Actuator Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment of the wastegate actuator. Do not overtighten.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold to Cylinder Head Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even clamping pressure. Use new gaskets. This value may be for bolts closer to the cylinder head, and is likely different sizes than the bolts holding the manifold sections together.
2

Exhaust Manifold Section Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Tighten all bolts evenly. Use new gaskets if applicable.

Exhaust Piping

1

Exhaust Pipe to Exhaust Manifold/Header Bolts/Studs

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use new gaskets. Tighten bolts/nuts evenly to ensure a leak-free seal.
2

Catalytic Converter to Exhaust Pipe Bolts/Studs

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use new gaskets. Tighten evenly to avoid leaks.
3

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the muffler is properly aligned before tightening bolts. Use new gaskets where applicable.

Exhaust Supports

1

Exhaust Support Bracket Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the brackets that support the exhaust system to the chassis. Do not over-tighten.
2

Exhaust Flange Clamp Bolt/Nut

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These clamps are sensitive to over-tightening. Use specified torque. Ensure clamp is properly seated.
3

Exhaust System V-Band Clamp Bolt/Nut

M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
V-band clamps require a specific torque to ensure a seal without damage. Estimated value, may vary by clamp design. Always inspect the clamp for damage before use.

Exhaust Sensors

1

Oxygen Sensor

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure the threads are clean. Do not over-tighten. Use anti-seize compound on threads if not already applied.
2

Exhaust Temperature Sensor

M14 x 1.5
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Sensor is sensitive to over-tightening. Do not exceed the torque specification. Estimated value, may vary by sensor design. Use anti-seize compound on threads if not already applied.

Fuel

Torque specifications for Fuel

Fuel Rail

1

Fuel Rail Mounting Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to prevent distortion. Ensure proper alignment before torquing.
2

Fuel Injector Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure injectors are properly seated before tightening. Do not overtighten to avoid damage.
3

Fuel Rail Banjo Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use new crush washers. Tighten to specified torque to ensure a leak-free seal. Estimated value; verify with service manual.

Fuel Pump

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the fuel pump module is properly seated against the tank surface before tightening. Do not over-tighten
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten all strap bolts evenly to prevent tank shifting. Ensure proper alignment.
3

Fuel Level Sensor Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly seated. Estimated value; verify with service manual.

Fuel Filter

1

Fuel Filter Housing Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Do not over-tighten, especially if the housing is plastic. Ensure proper alignment of the filter housing.
2

Fuel Filter Banjo Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use new crush washers. Tighten to specified torque to ensure a leak-free seal. Estimated value; verify with service manual.

Fuel Lines

1

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts evenly to ensure a proper seal between the filler neck and the body/tank.

Fuel Pressure Regulator

1

Fuel Pressure Regulator Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper seating of the regulator. Estimated value; verify with service manual.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of the compressor before tightening. Apply torque evenly to all bolts.
2

A/C Line Fittings

N/A
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Tighten fittings by hand initially, then snug them carefully using a wrench. Over-tightening can damage seals. Value estimated.

Ac Condenser

1

A/C Condenser Mounting Bolts/Nuts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Use care when tightening to avoid damaging the condenser fins. Torque may vary slightly; refer to the vehicle-specific manual if available. Value estimated.

Ac Evaporator

1

A/C Evaporator Housing Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Low torque due to plastic housing. Avoid over-tightening. Value estimated.
2

Expansion Valve Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Low torque due to seals. Ensure valve is properly seated before tightening. Value estimated.

Blower Motor

1

Blower Motor Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Low torque due to plastic housing. Ensure proper seating of the blower motor before tightening. Value estimated.

Hvac Control

1

HVAC Control Module Mounting Bolts/Screws

M4 x 0.7
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Very low torque due to small screws and plastic housing. Over-tightening can damage the module. Value estimated.

Suspension

Torque specifications for Suspension

Strut Shock Assembly

1

Strut/Shock Absorber Mounting Bolts

M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Tighten mounting bolts evenly to ensure proper alignment. Use new bolts if specified by the manufacturer.
2

Strut/Shock Absorber Top Mount Nut

M8 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Torque can vary slightly based on the specific strut top mount design. Do not overtighten.

Control Arms

1

Control Arm Bolts

M14 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Tighten control arm bolts with the vehicle at ride height to ensure correct bushing preload. It is also recommended to replace the bolts after removal.
2

Lower Control Arm Inner Bushing Bolt

M14 x 1.5
Torque Specification
1. 85 ft-lbs (115 N·m) 2. 90°
Important Notes
This is an estimated value. Actual value can vary. Ensure to replace the bolt. The angle is added after the initial torque spec is met.

Steering

1

Ball Joint Nut

M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Ensure the ball joint stud is properly seated in the knuckle before torquing the nut.
2

Tie Rod End Nut

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Hold the tie rod end stud to prevent it from rotating while tightening the nut. Ensure it is flush to the knuckle prior to torquing.
3

Steering Gear/Rack Bolts

M14 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Tighten steering rack bolts evenly to ensure proper alignment and prevent binding.

Sway Bar

1

Sway Bar Link Nut

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Tighten sway bar link nuts evenly. Ensure the sway bar link is properly seated.
2

Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Do not overtighten these bolts to avoid crushing the bushings.

Axle Hub

1

Axle Shaft to Wheel Hub Nut/Bolt

M24 x 1.5
Torque Specification
250 ft-lbs (339 N·m)
Important Notes
Estimated value, torque can vary slightly based on vehicle submodel. This is a critical torque that ensures proper wheel bearing preload.

Ride Height Sensor

1

Ride Height Sensor Linkage Bolt/Nut

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated value. Do not overtighten. Ensure sensor is not preloaded before tightening.

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 recommended torque value for the M8's lug nuts?

140 Nm (103 lb-ft) for both 19-inch and 20-inch wheels

Q2

What type of torque wrench IS best suited for BMW M8 torque specifications?

A precision click-type torque wrench IS recommended for accurate application

Q3

How often should I check and re-torque the M8's bolts?

It IS recommended to check and re-torque all critical bolts after 500-1000 miles, and every 12 months thereafter

Q4

What are the torque specifications for the M8's cylinder head bolts?

10 Nm (7 lb-ft) for the first pass, then 20 Nm (15 lb-ft) for the second pass, and finally 90 degrees for the third and final pass

Q5

How can I ensure proper torque application on the M8?

Always use a calibrated torque wrench, apply force smoothly and evenly, and avoid over-tightening

Q6

What are the torque specifications for the M8's oil filter housing?

25 Nm (18 lb-ft) for the 2019-2020 M8, and 30 Nm (22 lb-ft) for the 2021-Present M8

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

BMW Specific Digital Torque Wrench

BMW vehicles have specific torque specifications and require a wrench designed for them. This wrench will ensure accuracy and prevent overtightening.

  • Pre-programmed torque values for m8
  • Digital display for precise readings
  • Audible alarm when target torque IS reached
  • Reversible ratcheting mechanism
Learn more
Service Procedures

Engine Bolt Torque Specifications

This procedure outlines the necessary steps for tightening the engine bolts to their specified torque values.

  • Locate the engine bolts that need to be tightened.
  • Use the BMW Specific Digital Torque Wrench to tighten the bolts to the specified torque value.
  • Follow the tightening sequence specified in the service manual.
  • Double-check the torque values to ensure accuracy.
View full procedure
Technical Service Bulletins

Torque Value Updates for m8 Suspension Components

2023-05-10

This bulletin provides updated torque values for the suspension components of the m8. These updates are necessary to address potential safety concerns.

2019-Present m8

Resolution: Follow the updated torque values provided in the bulletin when servicing the suspension components of the m8.

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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.
  • 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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