BMW Vehicle Models 440i 2017-present Torque Specifications
BMW Vehicle Models 440i 2017-present

BMW Vehicle Models 440i 2017-present Torque Specifications

Complete BMW Vehicle Models 440i 2017-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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3.0l Engine

Torque specifications for 3.0L Engine

Cylinder Head

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
1. 18 ft-lbs (24 N·m) 2. 90° 3. 90°
Important Notes
Torque in a specific sequence, following manufacturer's specifications. Final torque is achieved with two 90-degree angle torques after initial torque value is met. Lubricate bolt threads with engine oil prior to installation.
2

Camshaft Bearing Cap Bolts/Nuts

M8 x 1.25
Torque Specification
1. 9 ft-lbs (12 N·m) 2. 105°
Important Notes
Initial torque followed by an angle torque for proper camshaft alignment. Torque bolts in sequence, incrementally.
3

Rocker Arms/Shafts Bolts

M6 x 1
Torque Specification
21 ft-lbs (28 N·m)
Important Notes
Ensure proper seating of rocker arms before tightening.
4

VANOS Solenoid Bolts

M6 x 1
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure proper seating of the solenoid before tightening.
5

Valve Cover Bolts

M6 x 1
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque in a criss-cross pattern to ensure even sealing.
6

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
48 ft-lbs (65 N·m)
Important Notes
Ensure the camshaft is properly positioned and aligned before tightening.

Engine Block

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
1. 24 ft-lbs (33 N·m) 2. 70°
Important Notes
Torque in a sequence, typically from the center outward. Initial torque followed by an angle torque. Lubricate threads with engine oil.
2

Connecting Rod Nuts

M9 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper seating of rod cap. Torque in sequence, incrementally.
3

Knock Sensor Bolt

M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Ensure proper sensor alignment.
4

Engine Mount Bolts (to engine block)

M12 x 1.75
Torque Specification
43 ft-lbs (58 N·m)
Important Notes
Use caution to support engine during installation.
5

Oil Pan Bolts

M6 x 1
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque in a criss-cross pattern to ensure even sealing.
6

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Always use a new crush washer when installing.

Intake Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Torque in a criss-cross pattern, starting from the center.
2

Throttle Body Bolts

M6 x 1
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper gasket alignment when installing the throttle body.
3

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Torque in a sequence, starting from the center and working outwards to ensure proper sealing.

Rotating Assemblies

1

Flywheel Bolts

M12 x 1.5
Torque Specification
58 ft-lbs (79 N·m)
Important Notes
Use a flywheel locking tool to prevent crankshaft rotation during tightening.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Specification
110 ft-lbs (149 N·m)
Important Notes
Use a crankshaft holding tool to prevent crankshaft rotation during tightening.

Cooling System

1

Water Pump Bolts

M6 x 1
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque in a criss-cross pattern to ensure even sealing.
2

Water Pump Pulley Bolts

M6 x 1
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper pulley alignment before tightening.
3

Thermostat Housing Bolts

M6 x 1
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper gasket alignment during installation.

Fuel System

1

Fuel Injector Bolts

M6 x 1
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper injector seating and alignment.

Ignition System

1

Spark Plugs

M14 x 1.25
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Use a spark plug socket to prevent damaging the porcelain. Avoid over-tightening.
2

Ignition Coil Bolt

M6 x 1
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the coil is properly seated before tightening.

Lubrication System

1

Oil Filter Cap

N/A
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Hand tighten and use a wrench to torque an additional half turn. Do not overtighten.
2

Oil Filter Housing Bolt

N/A
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Hand tighten and use a wrench to torque an additional half turn. Do not overtighten.

8hp Transmission

Torque specifications for 8hp Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Apply torque evenly to all mounting bolts. Ensure the mounting surfaces are clean and free of debris. It is advisable to use a thread locker, consult service manual.

Bell Housing

1

Bell Housing Bolts

M12 x 1.75
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Tighten bolts in a star pattern, alternating sides of the housing. Verify all bolts are properly seated. It is advisable to use a thread locker, consult service manual.

Oil Pan

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to avoid warping the pan. Ensure gasket is properly seated. Do not overtighten. Use a new gasket for each installation.

Drain Fill Plugs

1

Drain Plug

M18 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Always use a new crush washer when reinstalling the drain plug. Ensure plug threads are clean. Do not overtighten.
2

Fill Plug

M14 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Always use a new crush washer when reinstalling the fill plug. Ensure plug threads are clean. Do not overtighten.

Mechatronic Unit

1

Mechatronic Unit Mounting Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a specific sequence (usually from the center outwards) to avoid warping the unit. Ensure all surfaces are clean and free of debris. Always consult service manual for specific torque sequence.

Valve Body

1

Valve Body Mounting Bolts

M5 x 0.8
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a specific sequence (usually from the center outwards) to avoid warping the valve body. Ensure all surfaces are clean and free of debris. Always consult service manual for specific torque sequence. Use a precision torque wrench.

Oil Cooler Lines

1

Oil Cooler Line Banjo Bolt

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Always use new sealing washers when installing banjo fittings. Ensure proper alignment of the fittings. Do not overtighten.

Body

Torque specifications for Body

Wheel And Tire

1

Wheel Lug Nuts

M14 x 1.25
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Torque in a star pattern. Always refer to the vehicle's service manual for the most accurate values, which may vary.

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment of straps before tightening. Check for leaks after installation.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Do not over-tighten, as this could damage the filler neck or the mounting surface. Check for proper seal.

Body Panels

1

Hood Hinge Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the hood is properly aligned before tightening. May require adjustment shims.
2

Fender Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not over-tighten; these bolts thread into sheet metal. Ensure proper panel alignment before tightening.
3

Bumper Cover/Fascia Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
These are often plastic or thread into plastic, so do not over-tighten. Check for proper fit and alignment.
4

Tail Light Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
These bolts often secure into plastic. Do not over-tighten. Check for proper seal and alignment.

Door System

1

Door Hinge Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper door alignment before final torque. May require shims for adjustment.
2

Door Latch Striker Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Adjust striker position to ensure proper door latching. Do not over-tighten.

Interior

1

Seat Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Tighten in a star pattern. Ensure the seat is correctly positioned before final tightening. Do not over-torque.

Brakes

Torque specifications for Brakes

Front Brake Caliper

1

Front Caliper Mounting Bolts

M14 x 1.5
Torque Specification
95 ft-lbs (129 N·m)
Important Notes
These are often single-use bolts and should be replaced. Torque in a cross pattern.
2

Front Brake Caliper Banjo Bolt

M10 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Use new crush washers. Do not over-torque.
3

Front Brake Pad Retaining Pins/Bolts

M6 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure pins/bolts are properly seated. Do not over-tighten, or damage the caliper.
4

Front Brake Caliper Bleeder Screw

M7 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten gently to seal. Do not over-tighten, or damage the bleeder screw and caliper threads. Estimated value based on common bleeder screw sizes.

Rear Brake Caliper

1

Rear Caliper Mounting Bolts

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
These are often single-use bolts and should be replaced. Torque in a cross pattern.
2

Rear Brake Caliper Banjo Bolt

M10 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Use new crush washers. Do not over-torque.
3

Rear Brake Pad Retaining Pins/Bolts

M6 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure pins/bolts are properly seated. Do not over-tighten, or damage the caliper.
4

Rear Brake Caliper Bleeder Screw

M7 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten gently to seal. Do not over-tighten, or damage the bleeder screw and caliper threads. Estimated value based on common bleeder screw sizes.

Brake Rotor

1

Brake Rotor Retaining Bolt/Screw

M6 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure rotor is properly seated against the hub. Torque to manufacturer's specification. Estimated based on common sizes for this bolt.

Master Cylinder

1

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the master cylinder is properly aligned. Torque in a cross pattern if multiple bolts are used. Estimated based on common sizes for master cylinder mounting bolts.
2

Brake Master Cylinder Line Fittings

M10 x 1.0
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Use care when tightening to avoid damaging the fittings. Ensure fittings are properly aligned before tightening. Estimated value based on common line fitting sizes.

Wheel Mounting

1

Wheel Lug Nuts

M14 x 1.25
Torque Specification
100 ft-lbs (135 N·m)
Important Notes
Torque lug nuts in a star pattern. Always use a calibrated torque wrench. Ensure lug nuts are properly seated.

Drivetrain

Torque specifications for Drivetrain

Engine To Transmission

1

Flywheel Bolts

M12 x 1.5
Torque Specification
58 ft-lbs (79 N·m)
Important Notes
Apply thread locking compound. Torque bolts in a star pattern. Critical for proper power transfer in manual transmissions.
2

Flex Plate Bolts (Automatic Transmission)

M10 x 1.25
Torque Specification
1. 42 ft-lbs (57 N·m) 2. 90°
Important Notes
These are torque-to-yield bolts and must be replaced when removed. Apply thread locking compound. Torque bolts in a star pattern.
3

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Ensure transmission is properly aligned before tightening. These are critical for the structural integrity of the drivetrain.

Transmission

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Use a new gasket or sealant. Torque in a criss-cross pattern to prevent leaks.
2

Transmission Drain Plug

M18 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.
3

Transmission Fill Plug

M18 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.

Driveshaft

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Specification
92 ft-lbs (125 N·m)
Important Notes
Apply thread locking compound. Torque in a cross-pattern.
2

Driveshaft Center Support Bearing Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment of the bearing before tightening. Secures the bearing to the chassis.

Differential

1

Differential Mounting Bolts/Nuts

M14 x 2.0
Torque Specification
68 ft-lbs (92 N·m)
Important Notes
Ensure differential is properly aligned before tightening. Critical for supporting differential weight and torque.
2

Differential Drain Plug

M16 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.
3

Differential Fill Plug

M16 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.

Axles

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Torque bolts in a star pattern. High-strength bolts required for secure power transfer.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
200 ft-lbs (271 N·m)
Important Notes
Always use a new nut. High torque is essential for proper wheel bearing preload and joint stability.

Transfer Case

1

Transfer Case Drain Plug

M16 x 1.5
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten. Values are estimated based on similar components.
2

Transfer Case Fill Plug

M16 x 1.5
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten. Values are estimated based on similar components.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Mounting Bolt

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper coil seating before tightening. Over-tightening can damage the coil or threads.

Starting System

1

Starter Motor Mounting Bolt

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Ensure the starter motor is properly aligned before tightening. Over or under torquing can cause improper engagement or no start issues.

Charging System

1

Alternator Mounting Bolt

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure the alternator is properly aligned and the belt tension is correct before tightening. Over or under-torquing can cause improper belt alignment and damage the alternator. Estimated value.

Battery System

1

Battery Terminal Nut

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Do not over-tighten. Too tight can damage the soft terminal materials and cause corrosion, arcing or poor connections.

Engine Control System

1

Engine Control Unit (ECU) Mounting Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure proper ECU seating before tightening. Over-tightening can damage the circuit board. Estimated value.
2

Sensor Mounting Bolt (Crank/Cam/ABS/Wheel Speed, etc.)

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Values may vary by sensor and size. Ensure proper sensor seating. Over or under torquing can damage the sensor or create poor grounding. Estimated value.

Grounding System

1

Ground Strap/Cable Mounting Bolt (Engine/Chassis)

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure clean and secure connections for proper grounding. Values may vary based on location and bolt size. Over or under torque will cause poor electrical connection. Estimated value.

Lighting System

1

Headlight/Taillight Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Do not over-tighten as this can crack the lens housing. Estimated value.

Power Distribution

1

Fuse Box Mounting Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure proper box seating before tightening. Estimated value.
2

Wiring Harness Bracket Mounting Bolt

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure the harness is properly secured. Estimated value.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust Manifold

1

Exhaust Manifold to Cylinder Head Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Ensure the mating surfaces are clean before installation. Use new gaskets and/or bolts if specified in the service manual.
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Ensure proper alignment of exhaust pipe before tightening. Use new gaskets.
3

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment of catalytic converter. Use new gaskets if required.

Egr System

1

EGR Valve Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Use new gasket and torque to specified value. Over tightening can cause leaks.

Oxygen Sensors

1

Oxygen (O2) Sensor Mounting Bolt/Stud

M18 x 1.5 (Sensor Thread)
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
If the service manual specifies 'hand tight plus 1/4 turn' that can be used in absence of torque value. Always check manufacturer documentation. Use anti-seize compound on threads unless specified otherwise. Do NOT over torque, as this can damage the sensor or threads.

Nox Sensors

1

Nitrogen Oxide (NOx) Sensor Mounting Bolt

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N·m)
Important Notes
Ensure the mating surface on the exhaust pipe is clean, and use a new gasket if present. Over-tightening can damage the sensor.

Egt Sensors

1

Exhaust Gas Temperature (EGT) Sensor Mounting Bolt

M6 x 1.0
Torque Specification
8.5 ft-lbs (11.5 N·m)
Important Notes
Ensure the mating surface on the exhaust pipe is clean, and use a new gasket if present. Over-tightening can damage the sensor.

Differential Pressure Sensors

1

Differential Pressure Sensor Mounting Bolts/Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5.5 N·m)
Important Notes
The sensor housing is often plastic, so do not overtighten. Ensure the sensor is properly seated.

Air Mass Meter

1

Air Mass Meter (MAF/HMA) Mounting Screws

M5 x 0.8
Torque Specification
4 ft-lbs (5.5 N·m)
Important Notes
Do not over-tighten screws to avoid cracking the plastic housing.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure bolts are tightened in a star pattern to evenly distribute pressure.
2

Exhaust Manifold/Header to Cylinder Head Bolts (alternate)

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Applies to some models or aftermarket headers. Use a star pattern to evenly distribute clamping force.

Front Exhaust Section

1

Exhaust Pipe to Exhaust Manifold/Header Flange Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Tighten the flange bolts in a cross pattern to ensure a proper seal. Always use a new gasket.
2

Catalytic Converter to Exhaust Pipe Flange Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten in a cross pattern to ensure even pressure on the gasket.

Mid Exhaust Section

1

Exhaust V-band Clamp Bolt/Nut

M8 x 1.25
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Tighten the nut evenly, ensuring a secure connection.

Rear Exhaust Section

1

Muffler to Exhaust Pipe Flange Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten bolts in a cross pattern to ensure a proper seal with a new gasket.
2

Exhaust Hanger Bracket Bolts to Body

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper alignment and do not overtighten. The bracket is usually mounted to the chassis via a rubber isolator.

Sensors

1

Oxygen Sensor

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure sensor threads are clean. Over-tightening may damage threads or sensor. Apply anti-seize to the threads

Fuel

Torque specifications for Fuel

Fuel Rail And Injectors

1

Fuel Rail Mounting Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper seating of the fuel rail before tightening. Tighten bolts evenly.
2

Fuel Injector Mounting Bolts

M5 x 0.8
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure injectors are properly seated with new seals. Tighten bolts evenly to prevent leaks.
3

Fuel Line Banjo Bolt at Fuel Rail

M12 x 1.5
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Always use new copper crush washers on banjo bolts. Tighten to spec to prevent leaks.
4

Fuel Pressure Sensor Bolt

M4 x 0.7
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Do not overtighten; sensor could be damaged. Check for secure seal.

Fuel Pump

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten bolts evenly to secure the pump to the fuel tank. Ensure the seal is properly seated.
2

High-Pressure Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts evenly to ensure proper pump alignment and seal.
3

Fuel Tank Sending Unit Bolt

M4 x 0.7
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure proper alignment and a tight seal without overtightening. Estimated value.

Fuel Tank

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten to ensure the tank is securely held to the chassis.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure a proper seal to prevent fuel vapor leaks. Tighten evenly.

Fuel Filter

1

Fuel Filter Mounting Bolts/Nuts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure a proper seal to prevent fuel leaks. Do not overtighten.
2

Fuel Line Banjo Bolt at Fuel Filter

M12 x 1.5
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Always use new copper crush washers on banjo bolts. Tighten to spec to prevent leaks.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Apply even torque to all mounting bolts to avoid stress on the compressor housing.

Ac Lines

1

A/C Line Fittings

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten fittings in a staggered sequence to ensure even pressure and proper sealing. Use new o-rings or seals when reassembling. Do not over-torque.

Ac Condenser

1

A/C Condenser Mounting Bolts/Screws

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Avoid over-tightening which can damage the condenser and mounting points. Ensure proper alignment before tightening.

Ac Evaporator

1

A/C Evaporator Housing/Core Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Be careful not to over-tighten, as the housing is often plastic. Ensure alignment before tightening.

Heater Core

1

Heater Core Inlet/Outlet Pipe Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment of the pipes before tightening the bolts. Do not over-torque to prevent damage to seals or pipe connections.

Blower Motor

1

Blower Motor Mounting Bolts

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Care should be taken not to over-tighten, as the mounting surface is often plastic.

Suspension

Torque specifications for Suspension

Front Strut Assembly

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
These bolts secure the strut to the wheel carrier. Final tightening should be performed with the vehicle's weight on the tires.
2

Strut/Shock Absorber Top Mount Nuts/Bolts

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
These nuts/bolts secure the top of the strut assembly to the chassis. Final tightening should be performed with the vehicle's weight on the tires.

Front Control Arms

1

Control Arm Frame Side Bolts

M14 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
These bolts secure the control arm to the vehicle frame. Final tightening should be performed with the vehicle's weight on the tires.
2

Control Arm to Wheel Carrier Bolts/Nuts

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
These bolts/nuts secure the control arm to the wheel carrier. Final tightening should be performed with the vehicle's weight on the tires.

Steering Components

1

Tie Rod End Nut

M12 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle. Avoid over-tightening.
2

Steering Rack/Gear Mounting Bolts to Subframe

M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the steering rack to the subframe. Ensure proper alignment before tightening.

Sway Bar System

1

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 strut or control arm. Do not over tighten.
2

Sway Bar Mounting Bracket Bolts to Frame

M8 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
These bolts secure the sway bar brackets to the frame. Avoid over-tightening and ensure proper bushing alignment.

Miscellaneous Components

1

Ball Joint Nut

M12 x 1.25
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
This nut secures the ball joint to the control arm or steering knuckle. Ensure proper seating before tightening.
2

Wheel Speed Sensor Mounting Bolt

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
This small bolt secures the wheel speed sensor to the steering knuckle or hub assembly. Do not over-tighten.
3

Brake Caliper Guide Pin Bolts/Nuts

M8 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
These bolts secure the brake caliper guide pins. Ensure smooth movement of the caliper after 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 for the engine cylinder head bolts?

Refer to BMW Technical Document 11 11 9 100 255 for detailed instructions. General torque specifications are: first stage 40 Nm (29.5 lb-ft), second stage 60 Nm (44.3 lb-ft), and third stage 80 Nm (59 lb-ft) + 90°.

Q2

What IS the proper torque sequence for the exhaust manifold bolts?

Tighten the exhaust manifold bolts in the following sequence: 1-5-3-6-2-4. Torque specifications are: first stage 20 Nm (14.8 lb-ft) and second stage 30 Nm (22.1 lb-ft).

Q3

What tools are recommended for accurate torque measurement?

Use a high-quality torque wrench with a traceable calibration certificate. Digital torque wrenches are recommended for precise measurements.

Q4

How do I prevent over-tightening or under-tightening bolts?

Always refer to the BMW Technical Documents for specific torque values. Tighten bolts gradually, using a torque wrench with an audible or visual indicator to signal the desired torque.

Q5

What IS the torque specification for the oil filter housing bolts?

Oil filter housing bolts require two stages of tightening: first stage 15 Nm (11 lb-ft) and second stage 25 Nm (18 lb-ft).

Q6

What are the torque specifications for the suspension components?

Consult BMW Technical Document 31 10 9 000 101 for specific torque specifications for suspension components such as control arms, ball joints, and tie rods.

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 Torque Wrench (10-220 Nm)

Manufacturer-approved tool specifically designed for BMW vehicles, providing precise torque delivery and ensuring optimal performance.

  • Pre-set torque values for various BMW applications
  • Ergonomic design for comfortable use
  • Durable construction for long-lasting performance
  • Ratcheting mechanism for efficient tightening
Learn more

Digital Torque Adapter

Attaches to a standard torque wrench, providing digital precision and real-time torque readings.

  • High-accuracy strain gauge technology
  • Large, easy-to-read LCD display
  • Peak and track modes for different applications
  • Auto-off feature to conserve battery life
Learn more
Service Procedures

Bolt Torque Specifications for Engine Components

Comprehensive guide to tightening engine bolts, including cylinder head, timing chain, and oil pan.

  • Refer to the vehicle-specific service manual for exact torque values.
  • Clean all threads and surfaces before assembly.
  • Apply a small amount of anti-seize compound to prevent future corrosion.
  • Tighten the bolts gradually in a star pattern to ensure even distribution of force.
  • Double-check all torque values using a calibrated torque wrench.
View full procedure

Torque Specifications for Suspension Components

Detailed instructions for tightening bolts related to suspension, including control arms, shock absorbers, and sway bars.

  • Raise the vehicle safely using a jack and jack stands.
  • Remove the necessary components to access the bolts.
  • Clean and inspect the bolts and threads.
  • Apply torque to the bolts as specified in the service manual.
  • Reinstall all components and double-check torque values.
View full procedure
Technical Service Bulletins

Technical Service Bulletin: Engine Bolt Torque Correction

2020-03-15

Important update from BMW regarding revised torque specifications for certain engine bolts.

2017-2020 440i

Resolution: Refer to the updated service manual for the correct torque values and follow the revised tightening procedure.

Technical Service Bulletin: Suspension Bolt Recall

2022-07-01

Safety recall notice regarding potentially loose suspension bolts.

2018-2023 440i

Resolution: Contact an authorized BMW dealer immediately to schedule an inspection and repair.

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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.
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  • 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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