BMW Vehicle Models 745i 2020-present Torque Specifications
BMW Vehicle Models 745i 2020-present

BMW Vehicle Models 745i 2020-present Torque Specifications

Complete BMW Vehicle Models 745i 2020-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 1.75
Torque Specification
1. 18 ft-lbs (24 N·m) 2. 90° 3. 90°
Important Notes
Use a multi-step tightening sequence following a specific pattern. Final torque is achieved through angular tightening. Bolts are typically torque-to-yield and must be replaced when removed.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure even clamping for proper valvetrain operation. Can also be an M6
3

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten using the proper sequence starting from the center and working outwards to ensure even pressure and prevent exhaust leaks.
4

Spark Plugs

M14 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Proper torque is crucial for good electrical and thermal contact. Do not over-tighten.

Crankshaft And Rotating Assembly

1

Main Bearing Bolts

M10 x 1.5
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 50°
Important Notes
Follow a multi-step tightening procedure and proper sequence to ensure proper crankshaft bearing clearances. Final torque is achieved via an angle.
2

Connecting Rod Nuts

M9 x 1.25
Torque Specification
1. 15 ft-lbs (20 N·m) 2. 60°
Important Notes
Must be torqued in multiple stages, with final torque achieved using an angle.
3

Flywheel Bolts

M10 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Ensure proper seating of the flywheel/flexplate against the crankshaft flange. Can also be a M12.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 2.0
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
High torque is essential to secure the pulley. Ensure proper alignment of pulley. Can be an M16 or M20.

Engine Block

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Overtightening can warp the pan or cause leaks. Use the proper gasket.
2

Water Pump Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque is essential to prevent coolant leaks. Ensure the water pump is properly seated to the block.
3

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Use a new crush washer to ensure a proper seal. Do not over-tighten.

Valvetrain

1

Camshaft Sprocket Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Proper torque ensures correct valve timing and prevents damage. Ensure proper sprocket alignment.
2

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Crucial for maintaining proper valve timing, and proper belt/chain tension.
3

Variable Valve Timing (VVT) Actuator Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensure proper actuator alignment and no binding. Can also be an M8.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten using the specified sequence for even clamping and to prevent vacuum leaks.
2

Throttle Body Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Proper seal is needed to prevent vacuum leaks.
3

EGR Valve Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper sealing to prevent vacuum leaks and ensure proper EGR functionality. Can be M6.
4

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Use the specified sequence starting from the center and working outwards to ensure even pressure and prevent exhaust leaks.

Fuel System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Proper torque is essential for preventing fuel leaks. Can also be a 8mm
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensure proper seating and sealing of the fuel injectors. Can be an 8mm.

Cooling System

1

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensure proper sealing to prevent coolant leaks. Can also be an 8mm bolt.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensure the pulley is flush with the pump before tightening. Can also be an 8mm

Engine Sensors

1

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensures proper sensor alignment and reading accuracy. Estimated value, can also be an M8.
2

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Proper torque prevents damage and ensures accurate readings. Estimated value, can also be an M8.
3

Coolant Temperature Sensor

M12 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque is critical to prevent coolant leaks and ensure accurate readings. This is a threaded sensor, not a bolt.
4

Knock Sensor Bolt

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque ensures the sensor works correctly and protects the engine from pre-ignition.

Accessory Drive

1

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Proper torque ensures correct belt tension and system function.
2

Drive Belt Idler Pulley Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure pulley is properly aligned before tightening.

Misc Fasteners

1

Valve Cover Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Proper torque to ensure oil seal is met without damaging the cover.
2

Ignition Coil Bolt

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensure the coil is properly seated. Can be an 8mm.

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
Ensure mating surfaces are clean. Tighten all mounting bolts evenly.

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Use new gasket and follow the specified torque sequence. Tighten bolts in a criss-cross pattern.
2

Transmission Oil Pan Drain Plug

M14 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use a new sealing washer on the drain plug. Do not over-tighten.

Fluid Plugs

1

Transmission Fluid Drain/Fill Plugs

M18 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use new sealing washers. Do not over-tighten these plugs.

Mechatronic Unit

1

Mechatronic Unit Mounting Bolts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Tighten in a criss-cross pattern. Do not over-tighten, as this can distort the mechatronic housing.
2

Valve Body Mounting Bolts

M6 x 1.0
Torque Specification
1. 6 ft-lbs (8 N·m) 2.
Important Notes
Tighten bolts in a criss-cross pattern. Torque to 8 N·m.

Fluid Cooler Lines

1

Transmission Fluid Cooler Line Fittings (Banjo Bolts)

M12 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Use new sealing washers. Ensure banjo fitting is properly aligned.
2

Transmission Fluid Cooler Line Fittings (Threaded)

M16 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure fittings are properly threaded and aligned. Do not cross-thread

Torque Converter

1

Torque Converter Bolts

M10 x 1.25
Torque Specification
1. 44 ft-lbs (59 N·m) 2. 90°
Important Notes
Always use new torque converter bolts. Tighten in a star pattern. Angle is after initial torque value is reached. These are Torque to Yield Bolts.

Body

Torque specifications for Body

Fuel System

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Ensure fuel tank straps are properly aligned before tightening. These bolts secure the fuel tank to the vehicle's body or frame.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
These bolts fasten the fuel filler neck to the body. Do not overtighten to avoid damaging the filler neck.

Door System

1

Front Door Hinge Bolts to Body

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper door alignment before tightening. These bolts secure the front door hinges to the vehicle body.
2

Rear Door Hinge Bolts to Body

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper door alignment before tightening. These bolts secure the rear door hinges to the vehicle body.
3

Door Latch/Striker Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the door latch to the door and the striker to the body. Ensure the latch and striker are aligned for proper door closure.

Exterior Panels

1

Fender Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
These bolts attach the fenders to the body. Ensure proper panel alignment.
2

Bumper Mounting Bolts (Front and Rear)

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
These bolts secure the bumper to the vehicle structure. Ensure proper bumper alignment before tightening.
3

Grille Mounting Bolts/Screws

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
These fasteners secure the grille to the body. Do not overtighten to avoid damaging the plastic grille.
4

Side Skirt Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
These bolts attach the side skirts to the body panels. Ensure proper alignment to avoid damage.
5

Rocker Panel Mounting Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
These bolts secure the rocker panels to the vehicle body. Ensure proper alignment for correct seal.

Hood Trunk System

1

Hood Hinge Bolts to Body

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the hood hinge to the vehicle body. Ensure proper hood alignment before tightening.
2

Hood Hinge Bolts to Hood

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the hood hinge to the hood itself. Ensure proper hood alignment before tightening.
3

Hood Latch Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
These bolts secure the hood latch mechanism to the body. Ensure proper latch alignment.
4

Hatch Hinge Bolts to Body

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
These bolts secure the trunk/hatch hinge to the vehicle body. Ensure proper alignment before tightening.
5

Hatch Hinge Bolts to Trunk

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
These bolts secure the trunk/hatch hinge to the trunk/hatch. Ensure proper alignment before tightening.

Lighting System

1

Headlight Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
These bolts secure the headlight assembly to the body. Do not overtighten to avoid damaging the light assembly or the body.
2

Taillight Mounting Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (10 N·m)
Important Notes
These bolts secure the taillight assembly to the body. Do not overtighten to avoid damaging the light assembly or the body.

Mirror System

1

Side Mirror Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (10 N·m)
Important Notes
These bolts secure the side mirror to the door or body. Ensure proper mirror alignment before tightening.

Electrical System

1

Body Control Module (BCM) Mounting Bolts/Screws

M6 x 1.0
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
These bolts/screws secure the BCM to the body. Ensure proper ground contact if applicable. Do not overtighten, or damage may result to the mounting threads.

Interior System

1

Interior Trim Fasteners/Screws

M5 x 0.8
Torque Specification
4.5 ft-lbs (6 N·m)
Important Notes
These fasteners secure various interior trim pieces. Do not overtighten to avoid damaging plastic components.
2

Seat Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
These bolts secure the seats to the vehicle floor. Correct torque is critical for passenger safety.

Roof System

1

Sunroof Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (10 N·m)
Important Notes
These bolts secure the sunroof assembly to the vehicle body. Ensure proper alignment and smooth operation before tightening.
2

Roof Rail Mounting Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
These bolts secure the roof rails to the vehicle body. Ensure proper alignment and smooth operation before tightening.

Window System

1

Window Regulator Fasteners

M6 x 1.0
Torque Specification
8 ft-lbs (10 N·m)
Important Notes
These fasteners secure the window regulator to the door. Do not overtighten to avoid binding the regulator.

Brakes

Torque specifications for Brakes

Brake Calipers

1

Brake Caliper Mounting Bolts

M12 x 1.75
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Secures the brake caliper to the mounting bracket. Use new bolts if available. Ensure threads are clean and free of debris.
2

Brake Caliper Guide Pin Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Secures the caliper guide pins. Ensure proper lubrication on guide pins prior to assembly. Estimated torque value.

Caliper Mounting Brackets

1

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Secures the caliper mounting bracket to the steering knuckle or hub carrier. Use new bolts if available. Ensure threads are clean and free of debris.

Brake Rotors

1

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Secures the brake rotor to the wheel hub. These bolts might be smaller in some applications. Ensure mating surfaces are clean and free of rust or debris.
2

Brake Rotor Set Screw

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
This screw is used to hold the brake rotor in place during assembly. Estimated torque value. Do not overtighten.

Brake Lines

1

Brake Line Banjo Bolt

M10 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Connects the brake line to the caliper or brake hose. Always use a new crush washer. Estimated torque value.

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
Tighten in a star pattern in multiple passes. Ensure bolts are clean and lightly oiled before installation. Always replace torque-to-yield bolts with new ones.
2

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Ensure the transmission is properly aligned before tightening. Check for correct thread engagement.

Transmission Housing

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even sealing pressure. Use a new gasket or sealant if required.
2

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use a new sealing washer or crush washer for each plug. Do not overtighten.

Driveshaft And Axles

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure the mating surfaces are clean. Replace any damaged or corroded bolts.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
200 ft-lbs (271 N·m)
Important Notes
Use a new nut. If applicable, stake the nut after torquing to secure it.
3

Propeller/Drive Shaft Bolts

M10 x 1.25
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Tighten bolts in a star pattern. Ensure proper alignment of the driveshaft.
4

Flex Disc (Guibo) Bolts

M12 x 1.5
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Tighten bolts in a star pattern. Replace bolts if they show any signs of stretching.
5

Center Support Bearing Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the bearing is correctly positioned on the vehicle chassis. Use new bolts if necessary.

Differential And Transfer Case

1

Differential Mounting Bolts

M12 x 1.75
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Tighten in a star pattern. Ensure proper alignment.
2

Differential Drain/Fill Plug

M18 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Use a new sealing washer or crush washer for each plug. Do not overtighten.
3

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use a new sealing washer or crush washer for each plug. Do not overtighten.

Wheel Hubs

1

Wheel Hub/Bearing Bolts

M14 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Tighten in a star pattern. Ensure the wheel hub is properly seated before tightening. Some bolts may be torque to yield and should be replaced.

Electrical

Torque specifications for Electrical

Engine Electrical

1

Ignition Coil Mounting Bolt

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensures proper grounding and coil positioning. Do not over-tighten.
2

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensures proper starter alignment and secure mounting for reliable engine starting. Tighten evenly.
3

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensures proper alternator alignment and secure mounting. Important for correct belt tension and grounding. Tighten evenly.
4

Ground Strap Bolt (Engine to Chassis)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensures a good electrical ground connection between the engine and chassis. Important to ensure the serrated teeth are fully engaged.
5

Crankshaft Position Sensor Mounting Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensures proper sensor alignment and secure mounting. Avoid over-tightening which can damage the sensor.
6

Camshaft Position Sensor Mounting Bolt

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

Battery And Charging

1

Battery Terminal Nuts

M8 x 1.25
Torque Specification
4.5 ft-lbs (6 N·m)
Important Notes
Ensures good electrical contact without damaging the battery terminals. Do not over-tighten.

Control Modules

1

Engine Control Unit (ECU) Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensures secure mounting and proper grounding of the ECU. Over tightening can damage the module.
2

Body Control Module (BCM) Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensures secure mounting and proper grounding of the BCM. Over tightening can damage the module.
3

Fuse Box/Module Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensures a secure mount and good electrical contact. Avoid over tightening which can damage the box or mounting location.
4

Wiring Harness Connector Mounting Bolts/Screws

M4 x 0.7
Torque Specification
3 ft-lbs (4 N·m)
Important Notes
Ensures secure connection of the wiring harnesses. Do not over-tighten.

Lighting

1

Headlight Module Mounting Bolts

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Ensures secure mounting of the headlight module. These are often plastic and should not be over tightened.
2

Tail Light Module Mounting Bolts

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Ensures secure mounting of the tail light module. These are often plastic and should not be over tightened.

Emissions Sensors

Torque specifications for Emissions_sensors

Egr System

1

EGR Valve Mounting Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper gasket alignment before tightening. Tighten all bolts evenly to avoid leaks.

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten in a cross pattern to ensure even pressure and prevent warping. Use new gaskets when reassembling.
2

Exhaust Pipe to Exhaust Manifold/Header Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Use new gaskets or sealing rings to ensure a leak-free connection. Torque bolts evenly.

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper alignment and use new gaskets. Tighten evenly to prevent leaks.

Oxygen Sensors

1

Oxygen (O2) Sensor Mounting Bolt/Stud (M18 Threads)

M18 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use an anti-seize compound on the threads if required. Ensure sensor is properly seated before tightening.
2

Oxygen (O2) Sensor Mounting Bolt/Stud (M12 or M14 Threads)

M12 x 1.5 / M14 x 1.5
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Use an anti-seize compound on the threads if required. Ensure sensor is properly seated before tightening.

Nox Sensors

1

Nitrogen Oxide (NOx) Sensor Mounting Bolt/Stud

M8 x 1.25
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensure sensor is properly seated. Do not overtighten.

Mass Airflow Sensors

1

Mass Air Flow (MAF) Sensor Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten as this may damage the sensor or the plastic housing. Ensure no air leaks around the mounting point.

Intake Air Temp Sensors

1

Intake Air Temperature (IAT) Sensor Mounting Screw

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Be careful not to over tighten since it mounts to plastic.

Exhaust Gas Temp Sensors

1

Exhaust Gas Temperature (EGT) Sensor Mounting Bolt

M8 x 1.25
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensure the sensor is properly seated and use an anti-seize compound if necessary.

Particulate Matter Sensors

1

Particulate Matter (PM) Sensor Mounting Bolts/Studs

M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure sensor is properly seated before tightening. Use new gaskets/seals if applicable.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M8 x 1.25
Torque Specification
1. 18 ft-lbs (24 N·m)
Important Notes
Torque bolts in a criss-cross pattern, working from the center outwards. Ensure a proper seal to prevent leaks.
2

Exhaust Manifold/Header Bolts (General)

M8 x 1.25
Torque Specification
1. 18 ft-lbs (24 N·m)
Important Notes
Torque bolts in a criss-cross pattern, working from the center outwards. Some applications may require a higher torque spec, always refer to the vehicle-specific service manual.

Downpipe

1

Exhaust Pipe to Exhaust Manifold/Header Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Ensure proper alignment of exhaust pipe to the manifold/header flange and use new gaskets when installing
2

Exhaust Flange Bolts (General)

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
This is a general torque for M8 exhaust flange bolts, if a different size is present, adjust torque values accordingly.

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the catalytic converter and exhaust pipe flanges are properly aligned. Use new gasket if applicable.

Muffler

1

Muffler to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Inspect for any wear or damage in the exhaust system before installation, especially the rubber exhaust hangers.

Turbocharger

1

Turbocharger Exhaust Outlet Flange Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
This torque spec is an estimate for a typical M10 exhaust flange bolts at a turbocharger. Always verify the specific torque value with the manufacturer. Ensure proper sealing to prevent leaks.

General Components

1

Exhaust Hanger Bracket Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure the hanger is properly positioned to support the exhaust system. Check for any damaged rubber hangers.
2

Exhaust Clamp Bolts (General)

M8 x 1.25
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
This is a general torque for an exhaust clamp. Always check manufacturer specifications for the specific clamp used on the vehicle. Over-tightening can damage the clamp and/or pipes.
3

Oxygen (O2) Sensor

M18 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Do not over-tighten. Ensure the sensor threads smoothly into the bung. Use anti-seize if necessary, taking care not to contaminate the sensor tip.

Fuel

Torque specifications for Fuel

Fuel Rail

1

Fuel Rail Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensure mating surfaces are clean before installation. Tighten evenly to prevent leaks.
2

Fuel Injector Retaining Bolts/Clips

M5 x 0.8
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
These may be small screws or clips. Be careful not to overtighten.

Fuel Pump

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Ensure the fuel pump is correctly seated before tightening. Access may be difficult. Do not over-tighten.
2

Fuel Level Sender Mounting Screws

M4 x 0.7
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
These are often small screws, usually attaching to the plastic fuel tank. Do not over-tighten. Estimated value.

Fuel Tank

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These bolts are load bearing, use caution. Proper torque is critical to prevent tank shifting.
2

Fuel Tank Access Panel Screws

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
These screws secure the fuel tank access panel; do not overtighten. Estimated value.

Fuel Lines

1

Fuel Line Fitting (Banjo Bolt)

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque values vary based on fitting size and type; this is a generalized value. Always consult your specific repair manual for accurate torque values.
2

Fuel Filter Bolt/Nut

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure that all sealing washers are in place prior to installation. Cleanliness is important at these connection points.

Fuel Filler

1

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Do not over-tighten, these bolts often have small heads and are easy to overtighten.

Fuel Pressure

1

Fuel Pressure Sensor Bolt/Nut

M5 x 0.8
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
The fuel pressure sensor is a sensitive component. Be careful not to overtighten. Estimated value.

High Pressure Pump

1

High Pressure Fuel Pump Mounting Bolts/Nuts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
It is important to ensure these bolts are installed to the manufacturers specifications to prevent vibrations, oil leaks, and proper installation. Estimated value.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure mounting surfaces are clean and free of debris before installation. Tighten evenly.

Ac Lines

1

A/C Line Fittings

varies, typically M8-M10 threads
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Use two wrenches to prevent twisting of the lines and fittings when tightening. Overtightening can damage the fitting. Value is for typical fittings; verify specifications for specific sizes.

Ac Condenser

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Ensure the condenser is properly aligned with its mounting points. This value is an estimate, please verify with the manufacturer’s service manual for the specific vehicle.

Ac Evaporator

1

A/C Evaporator Housing Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure the evaporator housing is properly aligned before tightening bolts. This value is an estimate, please verify with the manufacturer’s service manual for the specific vehicle.

Ac Expansion Valve

1

A/C Expansion Valve Bolts/Screws

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten as this could damage the valve or mating surfaces. This value is an estimate, please verify with the manufacturer’s service manual for the specific vehicle.

Blower Motor

1

HVAC Blower Motor Mounting Bolts/Screws

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Tighten evenly to prevent distortion of the blower motor housing. This value is an estimate, please verify with the manufacturer’s service manual for the specific vehicle.

Hvac Control Module

1

HVAC Control Module/Actuator Bolts

M4 x 0.7
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Avoid over-tightening, as this can damage the module/actuator housing or mounting points. This value is an estimate, please verify with the manufacturer’s service manual for the specific vehicle.

Suspension

Torque specifications for Suspension

Front Struts

1

Strut Lower Mounting Bolts

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
These bolts secure the lower end of the strut to the steering knuckle. Ensure proper alignment during installation.
2

Strut Top Mount Nuts

M8 x 1.25
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
These nuts secure the top of the strut assembly to the vehicle's chassis. Estimated value, confirm with service manual.

Front Control Arms

1

Control Arm Mounting Bolts (Chassis Side)

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
These bolts secure the control arm to the vehicle's frame/subframe. Tighten with suspension loaded in normal ride height when possible.
2

Lower Control Arm Ball Joint Mounting Bolt

M12 x 1.5
Torque Specification
1. 40 ft-lbs (54 N·m) 2. 90°
Important Notes
This bolt secures the ball joint to the steering knuckle. First torque, then angle tighten. Consult specific service manual for exact angle.
3

Ball Joint Nut

M12 x 1.25
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Secures the ball joint to the control arm. Ensure correct thread engagement before tightening.

Steering

1

Tie Rod End Nut

M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Secures the tie rod end to the steering knuckle. Ensure proper alignment during installation.

Sway Bar

1

Sway Bar Link Nut

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Secures the sway bar link to the strut or control arm. Do not over-tighten these nuts.
2

Sway Bar Mounting Bracket Bolts

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Secures the sway bar mounting brackets to the vehicle frame or subframe. Estimated value, confirm with service manual.

Wheel And Hub

1

Wheel Lug Nuts

M14 x 1.25
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Secures the wheel to the hub. Torque in a star pattern. Ensure proper thread engagement before tightening.
2

Wheel Hub/Bearing Bolts

M12 x 1.5
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Secures the wheel hub/bearing to the steering knuckle. Ensure proper bearing preload if applicable.

Steering Knuckle

1

Steering Knuckle/Upright Mounting Bolts

M12 x 1.75
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
These bolts secure the steering knuckle to the suspension. This is an estimated average and may vary. Check specific manual. Tighten with suspension loaded in normal ride height if possible.

Rear Suspension

1

Rear Axle Control Arm Bolts

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
These bolts secure the rear control arms to the frame and hub/upright. Tighten with suspension loaded in normal ride height when possible. If different sized bolts are used, check service manual for correct torque.

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 torque specification for the engine head bolts on a 2020-Present BMW 745i?

The torque specification for the engine head bolts IS 80 ft-lb (108 Nm) plus an additional 90 degrees.

Q2

What type of torque wrench should I use for critical components like the cylinder head bolts?

Always use a properly calibrated torque wrench that meets or exceeds the accuracy requirements specified by BMW. Click-type torque wrenches and torque angle gauges are recommended for precise torque application.

Q3

IS it necessary to replace the bolts after torquing them to specification?

Yes, it IS highly recommended to replace any bolts that have been torqued to yield, especially critical bolts like engine head bolts. Reusing yield bolts can compromise their structural integrity and lead to failure.

Q4

What are the consequences of over-torquing or under-torquing bolts?

Over-torquing can stretch or break the bolt, while under-torquing can lead to insufficient clamping force, resulting in loose components or potential leaks. Both scenarios can compromise the safety and reliability of the vehicle.

Q5

Where can I find additional torque specifications for my 2020-Present BMW 745i?

Refer to the BMW workshop manual or official BMW technical documentation for comprehensive torque specifications covering all components of your vehicle.

Q6

IS it safe to use impact wrenches for torque-critical applications?

No, impact wrenches should not be used for torque-critical applications. They can apply excessive force and damage the bolts or components. Use a properly calibrated torque wrench instead.

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 745i.

  • 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 Component Torque Specifications

Tightening torque values and procedures for various engine components on the 2020-Present BMW 745i.

  • Cylinder head bolts: 80 Nm + 90 degrees + 90 degrees
  • Intake manifold bolts: 25 Nm
  • Exhaust manifold bolts: 30 Nm
  • Oil pan bolts: 12 Nm
  • Timing chain cover bolts: 10 Nm
View full procedure

Suspension Component Torque Specifications

Tightening torque values and procedures for various suspension components on the 2020-Present BMW 745i.

  • Control arm bolts: 120 Nm
  • Sway bar links: 60 Nm
  • Strut bolts: 50 Nm
  • Lower ball joint bolts: 80 Nm
  • Tie rod bolts: 45 Nm
View full procedure

Brake Component Torque Specifications

Tightening torque values and procedures for various brake components on the 2020-Present BMW 745i.

  • Brake calipers: 110 Nm
  • Brake rotors: 30 Nm
  • Brake pads: 25 Nm
  • Brake lines: 10 Nm
  • ABS module bolts: 20 Nm
View full procedure
Technical Service Bulletins

Service Bulletin: Incorrect Engine Bolt Torque Specifications

2021-03-15

This bulletin addresses an error in the factory service manual regarding torque specifications for certain engine bolts. The incorrect torque values can lead to premature bolt failure and engine damage. Refer to this bulletin for updated torque specifications.

2020-2021 745i

Resolution: Follow the revised torque specifications provided in the bulletin. Replace any bolts that have been overtightened according to the incorrect specifications.

Service Bulletin: Suspension Noise Investigation

2022-05-10

This bulletin provides guidance on diagnosing and repairing suspension noise issues that may be encountered on the 745i. The bulletin includes specific torque values that may need to be adjusted to eliminate noise.

2022-Present 745i

Resolution: Perform the diagnostic steps outlined in the bulletin. Adjust torque values as necessary to eliminate noise. Refer to the service procedures section for specific torque specifications.

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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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  • Always follow the manufacturer's recommended procedures and safety precautions.
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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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