BMW Vehicle Models 745i 2002-2009 Torque Specifications
BMW Vehicle Models 745i 2002-2009

BMW Vehicle Models 745i 2002-2009 Torque Specifications

Complete BMW Vehicle Models 745i 2002-2009 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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

4.4l Engine

Torque specifications for 4.4L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 18 ft-lbs (24 N·m) 2. 90° 3. 90°
Important Notes
These are torque-to-yield bolts. The angle torque is critical for proper sealing. Always replace bolts with new ones. Additional 90 degree angle turn is required after the initial 90 degree turn.

Crankshaft Assembly

1

Main Bearing Bolts

M12 x 1.5
Torque Specification
1. 85 ft-lbs (115 N·m) 2. 70°
Important Notes
These bolts likely require an additional angle torque. Always replace bolts with new ones.
2

Connecting Rod Nuts

M10 x 1.25
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 70°
Important Notes
These nuts likely require an additional angle torque. Always replace nuts with new ones.
3

Flywheel Bolts

M12 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Verify if an angle torque is needed. Bolts should be tightened in a star pattern
4

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Specification
1. 90 ft-lbs (122 N·m) 2. 60°
Important Notes
This bolt likely requires an additional angle torque. Always replace bolt with a new one.

Camshaft System

1

Camshaft Sprocket Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of camshaft and sprockets prior to torquing.
2

Camshaft Bearing Cap Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Estimated value, use proper torque sequence.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure rocker arms are correctly positioned before tightening bolts.

Engine Timing

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure timing components are properly positioned before tightening bolt.

Engine Covers

1

Valve Cover Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten, can damage valve cover.
2

Oil Pan Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten bolts in a cross pattern.

Intake System

1

Intake Manifold Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten bolts in a cross pattern to ensure even seal.
2

Throttle Body Bolts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten, can damage throttle body.

Exhaust System

1

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in a cross pattern to ensure even seal.
2

EGR Valve Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure a proper seal.

Fuel System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure fuel rail is seated correctly before tightening bolts.
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten, can damage injectors.

Ignition System

1

Spark Plugs

M14 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure spark plugs are properly seated before torquing.
2

Ignition Coil Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten, can damage ignition coils.

Cooling System

1

Water Pump Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Use proper torque sequence to ensure even pressure on gasket.
2

Water Pump Pulley Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure pulley is seated correctly before tightening bolts.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten, can damage thermostat housing.

Accessory Drive

1

Serpentine/Accessory Drive Belt Tensioner Bolt

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

Lubrication System

1

Oil Pump Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (13 N·m)
Important Notes
Estimated value, use proper torque sequence.
2

Oil Filter Housing Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment before torquing.
3

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Use new washer when reinstalling to prevent leaks

Engine Mounting

1

Engine Mounting Bolts

M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value, confirm based on specific engine mount.

Vanos System

1

VANOS Solenoid Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated value, do not overtighten these bolts.

6hp Transmission

Torque specifications for 6hp Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure bolts are clean and in good condition before installation. Use a torque wrench for accurate tightening.

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Use a new gasket and tighten bolts in a cross pattern to ensure even pressure and prevent leaks. Overtightening can damage the pan and cause leaks.

Transmission Plugs

1

Transmission Drain/Fill Plugs

M22 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Always use new sealing washers. Ensure proper torque to prevent leaks.

Drive Axle

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
Important Notes
Ensure bolts are in good condition, replace if needed, use thread locker if specified. Always torque all bolts evenly.

Propeller Shaft

1

Propeller/Drive Shaft Bolts

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure bolts are in good condition. Use a thread locker if specified. Torque all bolts evenly to avoid vibration issues.

Bellhousing

1

Bellhousing Bolts

M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Tighten bolts gradually in a cross pattern to avoid uneven pressure. These bolts are critical to alignment and preventing vibration. Estimated value, consult service manual.

Mechatronic Unit

1

Mechatronic Unit Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Tighten bolts in a cross pattern to prevent damage. Estimated value, consult service manual.

Valve Body

1

Valve Body Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Tighten in a cross pattern to ensure uniform clamping. Estimated value, consult service manual.

Cooler Lines

1

Transmission Cooler Line Fittings

M16 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Always use new sealing washers or o-rings. Over tightening can cause leaks. Estimated value, consult service manual.

Flex Plate Torque Converter

1

Flex Plate/Drive Plate to Torque Converter Bolts

M10 x 1.5
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Use new bolts, if specified. Torque bolts in a star pattern to prevent vibration. Estimated value, consult service manual.

Body

Torque specifications for Body

Fuel System

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure straps are correctly positioned before tightening. Torque all bolts evenly to prevent stress on the tank.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Do not overtighten to prevent damage to the filler neck or body panel. Ensure a good seal for the fuel system.

Closure Panels

1

Hood Hinge Bolts to Body

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper hood alignment before final tightening. Do not overtighten to prevent deformation of mounting points.
2

Trunk/Boot Lid Hinge Bolts to Body

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper trunk/boot lid alignment before final tightening. Do not overtighten to prevent damage to the hinges or body.

Exterior Panels

1

Fender/Wing Bolts (Front & Rear) to Body

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts gradually, working in a cross pattern to avoid warping or misalignment. Ensure flush mounting with adjacent panels.
2

Bumper Cover/Fascia Mounting Bolts to Body/Frame

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the bumper cover is properly aligned before tightening. Do not over-tighten to prevent damage to the bumper material.

Door System

1

Door Hinge Bolts to Body

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper door alignment and smooth operation before final tightening. Do not overtighten to avoid stressing the hinges or body.
2

Door Latch/Striker Bolts to Body

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Adjust the striker for proper door closure before tightening. Ensure the door closes securely and aligns correctly with the body.

Lighting System

1

Headlight Assembly Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten to avoid damaging the headlight housing or misaligning the beam. Ensure the headlight is correctly positioned.
2

Taillight Assembly Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten to avoid damaging the taillight housing or misaligning the assembly. Ensure the taillight is correctly positioned.

Mirrors

1

Side Mirror Housing Bolts to Door

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Ensure mirror is correctly aligned to door prior to tightening. Do not over tighten, as this can damage the mirror housing.

Interior Components

1

Seat Mounting Bolts to Chassis/Body

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure all bolts are correctly installed and securely torqued for passenger safety. These bolts are critical in the event of a collision.
2

Dashboard/Instrument Panel Mounting Bolts to Body

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten all bolts to prevent vibrations and rattles. Ensure dashboard is flush and properly aligned with the body.

Brakes

Torque specifications for Brakes

Caliper Mounting

1

Caliper Guide Pin Bolts

M10 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Secures the caliper to the mounting bracket. Ensure proper thread engagement. Always replace these bolts when performing brake service.
2

Caliper Mounting Bracket Bolts

M12 x 1.75
Torque Specification
125 ft-lbs (170 N·m)
Important Notes
Secures the caliper mounting bracket to the wheel knuckle or hub assembly. Apply even pressure to all fasteners. Always replace these bolts when performing brake service.

Rotor Mounting

1

Brake Rotor Retaining Bolts

M8 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Secures the brake rotor to the wheel hub. Ensure rotor sits flush against the hub before tightening. Always replace these bolts when performing brake service.

Hydraulic Fittings

1

Brake Line Banjo Bolts

M10 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Used to connect brake lines to the caliper and master cylinder. Always use new copper crush washers and ensure proper alignment. Torque value is estimated, consult the service manual for your application.
2

Brake Line Flare Fittings

3/8-24
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Used to connect steel brake lines. Ensure proper alignment and that the fitting threads smoothly. Torque value is estimated, consult the service manual for your application.
3

Brake Bleeder Screw

M7 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Used to purge air from the brake system. Be careful not to overtighten. Torque value is estimated, consult the service manual for your application.

Abs Sensor Mounting

1

ABS Sensor Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the ABS sensor to the suspension or hub. Do not overtighten as this can damage the sensor. Torque value is estimated, consult the service manual for your application.

Drivetrain

Torque specifications for Drivetrain

Engine Flywheel

1

Flywheel Bolts

M12 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Use a criss-cross pattern for tightening. Apply a small amount of threadlocker.

Transmission Mounting

1

Transmission Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Apply even pressure when tightening, use new bolts if possible.

Transmission Components

1

Transmission Oil Pan Bolts

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

Transmission Drain and Fill Plugs

M22 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Use a new sealing washer. Do not overtighten.
3

Transmission Output Shaft Flange Nut

M24 x 1.5
Torque Specification
120 ft-lbs (163 N·m)
Important Notes
This is an estimated value. Verify with the factory service manual. Ensure proper alignment.

Driveshaft And Axles

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Specification
59 ft-lbs (80 N·m)
Important Notes
Check bolt type and size as specifications vary.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
180 ft-lbs (244 N·m)
Important Notes
This nut is often a single use item. Replace if it is being removed.
3

Propeller/Drive Shaft Bolts

M12 x 1.25
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Use a criss-cross pattern. Ensure proper alignment before tightening.
4

Driveshaft Center Support Bearing Mounting Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
This is an estimated value. Ensure the bearing is properly aligned before tightening.
5

Guibo (Flex Disc) Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
This is an estimated value. Use a criss-cross pattern for tightening.

Differential

1

Differential Drain/Fill Plug

M18 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Use a new sealing washer.
2

Differential Housing Mounting Bolts

M12 x 1.75
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
This is an estimated value. Use a criss-cross pattern for tightening.

Transfer Case

1

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Use a new sealing washer.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure proper coil alignment before tightening. Over-tightening can damage the coil or mounting threads.

Engine Management

1

Engine Control Unit (ECU/DME) Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the ECU is properly aligned and seated. Over-tightening can damage the ECU housing.
2

Crankshaft Position Sensor Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly seated before tightening. Over-tightening can damage the sensor.
3

Camshaft Position Sensor Mounting Bolt

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

Mass Air Flow (MAF) Sensor Mounting Screw

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure proper seating and seal. Over-tightening can damage the sensor housing. Note: this value is an estimate.
5

Oxygen Sensor Mounting Bolt/Stud

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly seated in the exhaust bung. Over-tightening can damage sensor threads.

Power Generation And Starting

1

Starter Motor Mounting Bolt

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the starter motor is flush against the engine block or transmission housing. Over-tightening can damage threads.
2

Alternator Mounting Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper belt alignment. Over-tightening can damage the alternator housing or engine block threads.
3

Battery Terminal Nut

M8 x 1.25
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Ensure proper cable terminal contact before tightening. Under-tightening can cause poor connections. Over-tightening can damage terminals.

Electrical Distribution

1

Fuse Box/Junction Box Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure proper box alignment and seating. Over-tightening can damage the plastic housing.
2

Ground Strap/Cable Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure good contact between ground strap and mounting surfaces. Use a star washer when applicable. Over-tightening can damage the terminals.

Body Control

1

Body Control Module (BCM) Mounting Bolt/Screw

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Ensure the BCM is aligned properly before tightening. Over-tightening can damage the module's plastic housing. Note: this value is an estimate.

Abs System

1

ABS Control Module Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure proper module seating before tightening. Over-tightening may affect module function.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold/Header to Cylinder Head Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure even tightening to prevent leaks. Apply anti-seize to bolts.
2

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper sealing. Apply anti-seize to bolts.
3

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper alignment and sealing. Apply anti-seize to bolts.
4

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment. Apply anti-seize to bolts.
5

Oxygen (O2) Sensor

M18 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Always use anti-seize compound on the threads. Do not overtighten to prevent damage.

Intake System

1

Throttle Body Bolts

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten. Ensure proper gasket alignment.
2

Mass Air Flow (MAF) Sensor Mounting Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten, as the sensor housing can crack easily. Use even torque across all mounting points.
3

Intake Air Temperature (IAT) Sensor Bolt (if applicable)

M5 x 0.8
Torque Specification
3 ft-lbs (4 N·m)
Important Notes
Many IAT sensors do not have a torque spec and are hand-tight or twist lock. If a bolt exists, use minimal torque as the housing is often plastic. This value is estimated.

Fuel System

1

Fuel Injector Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper injector seating before tightening. Do not overtighten.

Engine Sensors

1

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten the bolt, ensure the sensor is seated correctly before tightening.
2

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten the bolt, ensure the sensor is seated correctly before tightening.

Egr System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the EGR valve is properly aligned and seated against the gasket. Tighten evenly to avoid leaks.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten bolts in a circular, alternating pattern, starting from the center and moving outwards. Always use new gaskets.

Front Exhaust Pipe

1

Exhaust Pipe to Exhaust Manifold/Header Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper alignment before tightening. Use new gaskets.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment before tightening. Use new gaskets.

Intermediate Exhaust Pipes

1

Exhaust Flange Bolts (M8)

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Use new gaskets. Ensure bolts are evenly tightened. Check for leaks after installation.
2

Exhaust Flange Bolts (M10)

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value. Use new gaskets. Ensure bolts are evenly tightened. Check for leaks after installation.
3

Exhaust Flange Bolts (M12)

M12 x 1.75
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Estimated value. Use new gaskets. Ensure bolts are evenly tightened. Check for leaks after installation.

Muffler

1

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Use new gaskets. Ensure proper alignment before tightening. Check for exhaust leaks after installation.

Oxygen Sensors

1

Oxygen Sensor

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Use anti-seize compound on sensor threads. Ensure sensor crush washer is properly seated. Do not overtighten.

Exhaust Hangers

1

Exhaust Hanger Bolts/Nuts to Chassis

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Do not overtighten these bolts/nuts. Torque value is estimated based on typical M8 bolt size. Check for proper alignment of exhaust after installation.

Fuel

Torque specifications for Fuel

Fuel Rail

1

Fuel Rail Mounting Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even pressure. Always use a calibrated torque wrench.
2

Fuel Injector Bolts

M5 x 0.8
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure injectors are properly seated before tightening. Do not overtighten to avoid damaging the injectors or seals.
3

Fuel Pressure Regulator Mounting Bolts/Screws

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly to prevent leaks and ensure proper regulator function.

Fuel Pump

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the fuel pump is properly aligned with the fuel tank before tightening.
2

Fuel Tank Sending Unit/Lock Ring

N/A - Lock Ring
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Hand-tighten the lock ring, then use a tool to engage the last 1/4 turn or 'notch'. Estimate based on similar lock rings. DO NOT overtighten.

Fuel Tank

1

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the filler neck is correctly positioned and sealed.

Fuel Lines

1

Fuel Line Fittings (General)

Varies - See Notes
Torque Specification
16 ft-lbs (22 N·m)
Important Notes
Torque may vary based on line size and fitting material. Use 14-18 ft-lbs (19-24 Nm) as a general guideline, and use a manual to confirm for specific applications. This is an estimated general value.

Fuel Filter

1

Fuel Filter Mounting Bolt/Nut

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the fuel filter is properly aligned on the mounting bracket before tightening. Do not overtighten.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure bolts are clean and threads are lightly lubricated. Torque values may vary; always check vehicle-specific manual.
2

A/C Line Fittings

Varies by fitting
Torque Specification
16 ft-lbs (22 N·m)
Important Notes
Use new O-rings. Torque is critical for a leak-free seal. Over-tightening can damage fittings or O-rings. Always consult vehicle-specific manual for correct torque value based on the exact fitting used.

Blower Motor

1

Blower Motor Mounting Bolts/Screws

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value; verify by vehicle. These bolts are often securing the blower motor to a plastic housing, so be careful when tightening. Do not overtighten.

Evaporator Assembly

1

Evaporator Housing/Core Bolts/Screws

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated value; verify by vehicle. These are usually low-torque fasteners securing plastic parts of the evaporator housing.

Heater Core

1

Heater Core/Valve Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated value; verify by vehicle. These bolts must seal coolant passages securely. Do not overtighten.

Condenser

1

Condenser Mounting Bolts/Screws

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Estimated value; verify by vehicle. These bolts secure the condenser to the vehicle chassis or mounting brackets. Be careful not to overtighten.

Expansion Valve

1

A/C Expansion Valve Mounting Bolts/Screws

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value; verify by vehicle. This valve is critical for proper refrigerant flow. Do not overtighten the small screws.

Suspension

Torque specifications for Suspension

Front Suspension

1

Strut/Shock Absorber Mounting Bolts

M12 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Secures the strut to the chassis/suspension components. Ensure correct alignment before tightening.
2

Lower Control Arm Bolts

M14 x 1.5
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Connects the lower control arm to the chassis and hub assembly. Tighten with suspension at normal ride height for optimal performance.
3

Upper Control Arm Ball Joint Nut

M12 x 1.5
Torque Specification
48 ft-lbs (65 N·m)
Important Notes
Secures the upper control arm ball joint to the steering knuckle. Ensure the ball joint is properly seated.
4

Tie Rod End Nut

M12 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Attaches the tie rod end to the steering knuckle. Ensure proper alignment for steering accuracy.
5

Sway Bar Link Nut

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Connects the sway bar link to the sway bar and strut/control arm. Ensure the sway bar is correctly positioned for optimal function.
6

Front Subframe Mounting Bolts

M14 x 1.5
Torque Specification
1. 90 ft-lbs (122 N·m) 2. 90°
Important Notes
These are stretch bolts and MUST be replaced upon removal. Tighten to 90 ft-lbs (122 N·m) + 90 degrees. Follow the tightening sequence for even clamping.
7

Front Axle-to-Hub Bolt

M16 x 1.5
Torque Specification
221 ft-lbs (300 N·m)
Important Notes
Secures the axle to the wheel hub assembly. High torque required for proper bearing function and wheel stability.

Rear Suspension

1

Rear Subframe Mounting Bolts

M14 x 1.5
Torque Specification
1. 90 ft-lbs (122 N·m) 2. 90°
Important Notes
These are stretch bolts and MUST be replaced upon removal. Tighten to 90 ft-lbs (122 N·m) + 90 degrees. Follow a cross tightening pattern.
2

Rear Trailing Arm Mounting Bolts

M14 x 1.5
Torque Specification
1. 74 ft-lbs (100 N·m) 2. 90°
Important Notes
These are stretch bolts and MUST be replaced upon removal. Tighten to 74 ft-lbs (100 N·m) + 90 degrees. Ensure trailing arm is aligned correctly.

Wheel Hub

1

Wheel Hub/Bearing Bolts

M12 x 1.5
Torque Specification
125 ft-lbs (170 N·m)
Important Notes
Secures the wheel hub/bearing assembly to the steering knuckle. Use a cross-tightening pattern. Proper torque is critical for the integrity of the wheel bearing.

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 specification for the cylinder head bolts on a 2002-2009 BMW 745i?

The cylinder head bolts must be torqued to 85 ft-lb (115 Nm) in three stages, followed by an additional 90-degree turn.

Q2

What type of torque wrench IS suitable for tightening suspension bolts on this vehicle?

Use a calibrated click-type torque wrench that meets or exceeds industry standards for accuracy and reliability.

Q3

Can I use thread locker on the brake caliper mounting bolts?

No, thread locker should not be used on brake caliper mounting bolts. It can compromise the integrity of the bolts and lead to safety issues.

Q4

What are the torque specifications for the spark plugs on a 2005 BMW 745i?

Spark plugs must be torqued to 22 ft-lb (30 Nm) using a spark plug torque wrench.

Q5

IS it necessary to retorque the exhaust manifold bolts after a few hundred miles of driving?

Yes, it IS recommended to retorque the exhaust manifold bolts to ensure proper sealing and prevent exhaust leaks.

Q6

Can I use an impact wrench to tighten the lug nuts on my BMW 745i?

No, using an impact wrench on lug nuts IS not recommended as it can overtighten them, leading to stripped threads or damaged wheels.

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

Tightening Sequence for Cylinder Head Bolts

Step-by-step procedure for properly tightening cylinder head bolts on the BMW 745i.

  • Clean bolt threads and apply new engine oil.
  • Tighten bolts to specified torque in multiple stages.
  • Follow the correct tightening sequence diagram.
  • Use a torque wrench to achieve accurate torque.
View full procedure

Suspension Component Torque Specifications

Torque specifications and tightening procedures for various suspension components on the BMW 745i.

  • Locate and identify suspension components.
  • Refer to torque specifications provided in the table.
  • Use a torque wrench to tighten fasteners.
  • Ensure proper alignment and orientation of components.
View full procedure
Technical Service Bulletins

Technical Service Bulletin: Incorrect Cylinder Head Bolt Torque

2004-06-01

Acknowledges an error in the original torque specifications for cylinder head bolts. Provides updated torque values.

2002-2004 745i

Resolution: Follow the revised torque specifications for cylinder head bolt tightening.

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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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About the Author

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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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