BMW Vehicle Models 550i 2011-2016 Torque Specifications
BMW Vehicle Models 550i 2011-2016

BMW Vehicle Models 550i 2011-2016 Torque Specifications

Complete BMW Vehicle Models 550i 2011-2016 torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. Essential information for proper assembly and maintenance.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

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Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

4.4l Engine

Torque specifications for 4.4L Engine

Cylinder Head and Valvetrain

1

Cylinder Head Bolts

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
2

Rocker Arms/Shafts Bolts

M10 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
3

Valve Cover Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)

Engine Block and Crankshaft

1

Main Bearing Bolts

M14 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
2

Connecting Rod Nuts

M12 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
3

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Specification
85 ft-lbs (115 N·m)

Camshaft and Timing System

1

Camshaft Sprocket Bolt

M14 x 1.5
Torque Specification
65 ft-lbs (88 N·m)
2

Timing Belt/Chain Tensioner Bolt

M10 x 1.25
Torque Specification
15 ft-lbs (20 N·m)

Engine Accessories

1

Alternator Mounting Bolts

M10 x 1.25
Torque Specification
24 ft-lbs (33 N·m)
2

A/C Compressor Mounting Bolts

M10 x 1.25
Torque Specification
24 ft-lbs (33 N·m)
3

Starter Motor Mounting Bolts

M12 x 1.5
Torque Specification
30 ft-lbs (41 N·m)

Engine Mounting and Transmission

1

Engine Mounting Bolts

M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
2

Engine Block to Transmission Bellhousing Bolts

M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.

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 all mating surfaces are clean and free of debris. Use a calibrated torque wrench.

Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even sealing. Avoid over-tightening to prevent damage to the pan or gasket.

Drain Fill Plugs

1

Transmission Drain Plug

M18 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Always use a new sealing washer. Do not over-tighten.
2

Transmission Fill Plug

M18 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Always use a new sealing washer. Do not over-tighten.

Mechatronics Unit

1

Mechatronics Unit Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Tighten in a criss-cross pattern to avoid distorting the mechatronics unit. These bolts require low torque. Estimated value.

Valve Body

1

Valve Body Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Tighten in a criss-cross pattern. These bolts require low torque. Estimated value.

Cooler Line Fittings

1

Transmission Cooler Line Fittings to Transmission Case

M16 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure fittings are properly aligned. Do not over-tighten.

Output Shaft Flange

1

Output Shaft Flange Bolt

M12 x 1.5
Torque Specification
52 ft-lbs (70 N·m)
Important Notes
Apply threadlocker if specified by the manufacturer.

Torque Converter

1

Torque Converter Bolts to Flex Plate

M10 x 1.25
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Tighten in a star pattern. May require new bolts. Estimated value.

Body

Torque specifications for Body

Wheels And Tires

1

Wheel Lug Nuts

M14 x 1.25
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Tighten lug nuts in a star pattern to ensure even clamping force. Recheck torque after 50-100 miles of driving.

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the straps are properly aligned before tightening. Do not overtighten to avoid damaging the fuel tank.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the fuel filler neck is correctly aligned to prevent leaks. Do not overtighten.

Bumper Covers

1

Front Bumper Cover Bolts/Screws

M6 x 1.0 (estimated, some screws)
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Estimated value. A mix of bolts and plastic screws are typically used. Tighten gradually and evenly. Be careful not to overtighten.
2

Rear Bumper Cover Bolts/Screws

M6 x 1.0 (estimated, some screws)
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Estimated value. A mix of bolts and plastic screws are typically used. Tighten gradually and evenly. Be careful not to overtighten.

Fenders

1

Fender Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment of the fender before tightening the bolts. Tighten in a criss-cross pattern.

Hood And Trunk

1

Hood Hinge Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the hood is properly aligned before tightening the bolts. Tighten all bolts evenly.
2

Trunk/Boot Lid Hinge Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the trunk lid is aligned before tightening the bolts. Tighten evenly.

Doors

1

Door Hinge Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper door alignment before tightening. Tighten all bolts evenly.
2

Door Latch/Striker Bolts

M8 x 1.25 (estimated)
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Adjust the latch position for proper door closing before tightening. Ensure smooth engagement.

Lighting

1

Headlight Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts gradually and evenly. Ensure proper light alignment before tightening.
2

Taillight Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten bolts gradually and evenly. Ensure the taillight seals properly.

Side Skirts And Grille

1

Side Skirt Mounting Bolts/Screws

M6 x 1.0 (estimated, some screws)
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Estimated value. A mix of bolts and screws may be used. Tighten gradually and evenly. Do not overtighten.
2

Grille Mounting Screws/Bolts

M5 x 0.8 (estimated)
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value. May use M5 or M6 bolts, or plastic screws. Tighten gently and evenly. Do not overtighten.

Body Panel Fasteners

1

Body Panel Fasteners (various locations)

M5 x 0.8 (estimated)
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Estimated value. General range for small bolts and screws in body panels. Use lower end of the range for plastic screws. Always check for correct values for specific parts.

Brakes

Torque specifications for Brakes

Caliper Mounting

1

Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
125 ft-lbs (169 N·m)
Important Notes
These bolts secure the caliper mounting bracket to the steering knuckle or hub carrier. Ensure proper thread engagement before torquing. Always use a calibrated torque wrench.
2

Brake Caliper Bolts

M12 x 1.25
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
These bolts secure the brake caliper to the mounting bracket. Ensure even clamping force by using a criss-cross pattern.

Rotor Retention

1

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
These bolts secure the brake rotor to the hub. They are not load-bearing but ensure the rotor is seated correctly. If size is M10, estimate torque to be 75 ft-lbs (102 N·m).

Hydraulic Connections

1

Brake Line Fitting (at Caliper)

M10 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
These fittings connect the brake lines to the brake caliper. Ensure a leak-free connection, and always use a flare nut wrench to prevent damage to the fitting. Estimated Value, common range is 12-18 ft-lbs (16-24 N·m)
2

Brake Line Fitting (at Master Cylinder/ABS Pump)

M10 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
These fittings connect the brake lines to the master cylinder or ABS pump. Use a flare nut wrench to avoid damaging the fitting. Estimated Value, common range is 10-15 ft-lbs (14-20 N·m)
3

Brake Caliper Bleeder Screw

M7 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Bleeder screws require low torque. Overtightening can damage the screw or caliper. Estimated Value, common range is 8-12 ft-lbs (11-16 N·m)

Pad Retention

1

Brake Pad Retaining Pin/Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
These pins or bolts retain brake pads within the caliper. Over-tightening can damage the pin or caliper. Estimated Value, common range is 5-10 ft-lbs (7-14 N·m).

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. Use new bolts if possible. Ensure flywheel is properly aligned before tightening.
2

Torque Converter Bolts (Automatic Transmission)

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten in a star pattern. Use new bolts if possible. Ensure torque converter is properly aligned before tightening.
3

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
45 ft-lbs (61 N·m)
Important Notes
Ensure transmission is properly positioned and aligned before tightening. Tighten bolts evenly.
4

Clutch Pressure Plate Bolts (Manual Transmission)

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten in a star pattern. Use new bolts if possible. Ensure pressure plate is properly aligned before tightening. This specification is for manual transmissions only.

Transmission

1

Transmission Oil Pan Bolts

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

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use a new sealing washer or O-ring. Do not over-tighten to avoid damaging the transmission case.
3

Input Shaft Retaining Nut/Bolt

M20 x 1.5
Torque Specification
115 ft-lbs (156 N·m)
Important Notes
Critical bolt for transmission stability. Ensure the input shaft bearing is correctly positioned before tightening. This value may vary depending on the specific transmission type, so verify with the manufacturer's service manual.
4

Output Shaft Flange Nut/Bolt

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Critical bolt for transmission output shaft stability. Verify the output shaft flange is correctly aligned. This value may vary depending on the specific transmission type, so verify with the manufacturer's service manual.

Driveshaft And Axles

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Tighten in a star pattern. Use new bolts where recommended.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
175 ft-lbs (237 N·m)
Important Notes
Use a new nut and torque to specified value. Ensure proper wheel bearing preload.
3

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Tighten in a star pattern. Ensure proper alignment of the driveshaft before tightening. Use new bolts where recommended.

Differential And Transfer Case

1

Differential Mounting Bolts

M12 x 1.75
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Ensure differential is aligned before tightening. Tighten bolts evenly.
2

Differential Drain/Fill Plug

M18 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use a new sealing washer. Do not over-tighten.
3

Transfer Case Mounting Bolts

M12 x 1.75
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Ensure transfer case is aligned before tightening. Tighten bolts evenly. This is for all-wheel drive vehicles only.
4

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use a new sealing washer or O-ring. Do not over-tighten. This is for all-wheel drive vehicles only.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Mounting Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure coil is seated properly before tightening. Overtightening can damage the coil or cylinder head.

Starting System

1

Starter Motor Mounting Bolt

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the starter motor is flush with the engine block before tightening. Proper alignment is crucial.

Charging System

1

Alternator Mounting Bolt

M8 x 1.25
Torque Specification
24 ft-lbs (33 N·m)
Important Notes
Ensure proper alignment of the alternator and belt tensioner before tightening. Check belt tension after installation.

Battery And Power Distribution

1

Battery Terminal Nut

M6 x 1.0
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Do not overtighten, which can damage the battery posts. Ensure terminals are clean for proper contact.
2

Fuse Box Mounting Bolt

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Ensure the fuse box is seated correctly before tightening. Do not overtighten as it may damage the plastic housing.

Engine Control Unit

1

ECU Mounting Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Ensure the ECU is properly aligned before tightening. Overtightening could damage the ECU housing or internal electronics.

Grounding System

1

Ground Strap Bolt (Small)

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure ground straps make clean, solid contact with the chassis or engine block. Clean mating surfaces.
2

Ground Strap Bolt (Large)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure ground straps make clean, solid contact with the chassis or engine block. Clean mating surfaces.

Wiring Harness Connectors

1

Wiring Harness Connector Bolt (Small)

M4 x 0.7
Torque Specification
4 ft-lbs (5.4 N·m)
Important Notes
Do not overtighten, which can damage the plastic connector housing or pins. Use a very low torque and a careful hand.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold to Cylinder Head Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even clamping force. Always refer to the vehicle-specific service manual for exact sequence.
2

Exhaust Pipe to Exhaust Manifold Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Ensure gasket is properly aligned. Tighten evenly to prevent leaks.
3

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure gasket is properly aligned. Tighten evenly to prevent leaks.

Oxygen Sensors

1

Oxygen (O2) Sensor Mounting (Threaded)

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure threads are clean and apply anti-seize compound to threads. Do not over-tighten. This torque value is an estimate, consult specific vehicle service manual for the specific value.
2

Oxygen (O2) Sensor Mounting Nut (Stud type)

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure stud is in good condition and the nut is the correct size. This torque value is an estimate, consult specific vehicle service manual for the specific value.

Intake System

1

Mass Airflow (MAF) Sensor Mounting Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten. These screws are often small and thread into plastic housings. Use a low-range torque wrench. This torque value is an estimate based on typical M5 bolt torque in plastic. Consult specific vehicle service manual for the specific value.

Egr System

1

EGR Valve Mounting Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure gasket is properly aligned. Tighten evenly to prevent leaks.

Nox Sensors

1

Nitrogen Oxide (NOx) Sensor Mounting Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure gasket is properly aligned. Tighten evenly to prevent leaks. This torque value is an estimate, consult specific vehicle service manual for the specific value.
2

Nitrogen Oxide (NOx) Sensor Mounting Nut (Stud type)

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure stud is in good condition and the nut is the correct size. This torque value is an estimate, consult specific vehicle service manual for the specific value.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold to Cylinder Head Bolts

M8 x 1.25
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 35 ft-lbs (47 N·m)
Important Notes
Apply torque in a criss-cross pattern. The initial torque is 20 ft-lbs (27 Nm) followed by the final torque of 35 ft-lbs (47 Nm).
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Apply torque in a criss-cross pattern. Ensure a new gasket is used.

Exhaust Piping

1

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Apply torque in a criss-cross pattern. Ensure a new gasket is used.
2

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Apply torque in a criss-cross pattern. Ensure a new gasket is used.
3

Exhaust Pipe Clamps

M8 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Ensure the clamp is properly positioned. Torque value is an estimate. Check the clamp manufacturer's recommendation if available.
4

Exhaust Flange Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Apply torque in a criss-cross pattern. This is a general spec for most exhaust flange connections. Ensure a new gasket is used.

Sensors And Mounts

1

Oxygen (O2) Sensor

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure the sensor is properly seated and use anti-seize compound on the threads. Torque value is an estimate, do not over-tighten.
2

Exhaust Hanger Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Do not overtighten, as this could cause damage. This torque applies to mounting the rubber hangers to the vehicle body. Value is an estimate.

Fuel

Torque specifications for Fuel

Fuel Rail And Injectors

1

Fuel Rail Mounting Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts evenly in a criss-cross pattern. Ensure the fuel rail is properly seated before final torque.
2

Fuel Injector Retaining Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten; injector bodies can be damaged. Ensure proper seating of injector seals. Torque the bolts evenly to prevent distortion.
3

Fuel Pressure Sensor Bolt

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Use care when torquing to avoid damaging the sensor. Ensure the sensor O-ring is properly seated.

Fuel Delivery System

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly. Ensure the fuel pump seal is properly seated. Do not overtighten.
2

Fuel Filter Mounting Bolt/Nut

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure fuel filter is correctly positioned in its bracket. Do not overtighten.
3

Low Pressure Fuel Line Connection Fittings

M12 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Use new sealing washers when connecting fuel lines, do not reuse old ones. Ensure fittings are properly aligned.
4

High Pressure Fuel Line Connections (Engine Side)

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use new sealing washers when connecting fuel lines, do not reuse old ones. Ensure the fitting is correctly seated. Do not overtighten.

Fuel Tank And Related

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts evenly. Ensure the fuel tank is properly positioned before tightening the bolts completely. Do not overtighten to avoid damaging the tank or strap.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts evenly to ensure a proper seal. Ensure the fuel filler neck is aligned correctly.
3

Fuel Tank Vent Line Fittings/Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure fittings are properly aligned. Do not over tighten.
4

Fuel Level Sensor Retaining Bolts/Screws

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Use care when torquing to avoid damaging plastic components. Ensure the sensor seal is properly seated.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Specification
24 ft-lbs (33 N·m)
Important Notes
Ensure bolts are clean and threads are in good condition. Tighten evenly to avoid stressing the compressor housing.
2

A/C Line Fittings

Varies, typically M10 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Use a flare nut wrench to prevent rounding of the fitting. Always use new O-rings when reconnecting refrigerant lines.

Ac Condenser

1

A/C Condenser Mounting Bolts/Nuts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not overtighten; the condenser core and mounting tabs can be easily damaged. Ensure mounting grommets/bushings are in good condition.

Ac Evaporator

1

A/C Evaporator Core Housing Bolts/Screws

M4 x 0.7 (Self-Tapping)
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
These screws are often self-tapping into plastic. Do not overtighten to avoid stripping or cracking the plastic housing. Estimated value.

Blower Motor

1

Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the blower motor is seated correctly before tightening. Do not over tighten the screws.

Hvac Control Module

1

HVAC Control Module Mounting Bolts/Screws

M4 x 0.7 (Self-Tapping)
Torque Specification
3 ft-lbs (4 N·m)
Important Notes
These are typically self-tapping screws into plastic. Overtightening can damage the module or mounting tabs. Estimated value.

Hvac Box

1

HVAC Box/Housing Mounting Bolts/Nuts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the HVAC box is properly aligned before tightening. Some bolts may have different torque specifications depending on location - refer to the service manual if available.

Suspension

Torque specifications for Suspension

Front Suspension

1

Front Strut to Body Mounting Bolts

M10 x 1.5
Torque Specification
1. 25 ft-lbs (34 N·m) 2. 90°
Important Notes
Tighten bolts to the specified torque, then rotate an additional 90 degrees. Ensure all bolts are properly engaged before final tightening.
2

Front Strut to Steering Knuckle Bolts

M12 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These bolts secure the strut to the knuckle. Ensure proper alignment before tightening.
3

Front Lower Control Arm Bolt (Chassis Side)

M14 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 90°
Important Notes
This bolt is self-locking and requires an initial torque followed by an angle. This value is estimated based on common practices for similar bolts, and may need verification by specific manufacturer documentation
4

Front Lower Control Arm Bolt (Knuckle Side)

M14 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 90°
Important Notes
This bolt is self-locking and requires an initial torque followed by an angle. This value is estimated based on common practices for similar bolts, and may need verification by specific manufacturer documentation
5

Front Upper Control Arm Bolt (Chassis Side)

M12 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 90°
Important Notes
This bolt is self-locking and requires an initial torque followed by an angle. This value is estimated based on common practices for similar bolts, and may need verification by specific manufacturer documentation
6

Front Upper Control Arm Bolt (Knuckle Side)

M12 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 90°
Important Notes
This bolt is self-locking and requires an initial torque followed by an angle. This value is estimated based on common practices for similar bolts, and may need verification by specific manufacturer documentation
7

Front Ball Joint Nut

M12 x 1.25
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Ensure the ball joint is properly seated before tightening the nut.
8

Front Tie Rod End Nut

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Ensure the tie rod end is properly seated before tightening. Do not over-tighten this nut.
9

Front Sway Bar Link Nut

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten the nut to the specified torque. Ensure the sway bar link is correctly positioned.
10

Front Wheel Hub/Bearing Bolts

M14 x 1.5
Torque Specification
130 ft-lbs (176 N·m)
Important Notes
Use a cross-tightening pattern to evenly apply pressure to the hub during installation. Important for bearing preload.
11

Front Strut Pinch Bolt (Steering Knuckle)

M12 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
This bolt secures the strut inside of the knuckle, and is vital for stability

Rear Suspension

1

Rear Shock Absorber Upper Mount Bolt/Nut (Body Side)

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Securely attach the shock absorber to the chassis using these bolts. Be sure to use the correct bolts that are meant for this location, as other bolts may not handle the shock loads correctly.
2

Rear Shock Absorber Lower Mount Bolt/Nut (Control Arm Side)

M14 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Securely attach the shock absorber to the control arm using these bolts. Be sure to use the correct bolts that are meant for this location, as other bolts may not handle the shock loads correctly.
3

Rear Control Arm Bolt (Chassis Side)

M14 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 90°
Important Notes
This bolt is self-locking and requires an initial torque followed by an angle. This value is estimated based on common practices for similar bolts, and may need verification by specific manufacturer documentation
4

Rear Control Arm Bolt (Knuckle Side)

M14 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 90°
Important Notes
This bolt is self-locking and requires an initial torque followed by an angle. This value is estimated based on common practices for similar bolts, and may need verification by specific manufacturer documentation
5

Rear Sway Bar Link Nut

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Tighten the nut to the specified torque. Ensure the sway bar link is correctly positioned.

Sway Bar System

1

Sway Bar Bushing Bracket Bolts (To Subframe or Chassis)

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Tighten bolts to the specified torque. Ensure the brackets and bushings are correctly aligned. These bolts should be tightened evenly.

Ride Height System

1

Ride Height Sensor Arm Link Nut

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
These are small links that connect suspension components to ride height sensor. Although not a primary support component they are important for proper operation of the air suspension system. Do not over tighten

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

What IS the recommended torque value for the engine oil drain plug?

25 ft-lb (34 Nm)

Q2

How tight should I torque the lug nuts on my wheels?

89 ft-lb (120 Nm)

Q3

What IS the proper tightening sequence for the cylinder head bolts?

Refer to BMW technical documentation for the specific tightening sequence and torque values for your engine

Q4

Can I use an impact wrench to tighten bolts on my BMW 550i?

No, it IS not recommended to use an impact wrench on critical bolts. Excessive torque can damage components

Q5

What IS the torque specification for the spark plugs?

18 ft-lb (25 Nm)

Q6

How often should I check the torque on the lug nuts?

Check the torque on the lug nuts regularly, especially after installing new tires or after driving on rough roads

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)

Provides precise torque measurements for accurate bolt tightening and proper assembly. The range covers most applications on the 2011-2016 BMW 550i.

  • Digital display for clear readings
  • Audible signal upon reaching target torque
  • Interchangeable measurement units (Nm, ft-lb, in-lb)
  • Convenient ratcheting mechanism for easy operation
Learn more
Service Procedures

Engine Bolt Torque Specifications

Comprehensive guide to tightening and loosening engine bolts on the 2011-2016 BMW 550i, ensuring proper engine performance and longevity.

  • Cylinder head bolts: 80 Nm + 90 degrees + 90 degrees
  • Camshaft bolts: 120 Nm
  • Crankshaft pulley bolt: 150 Nm
  • Oil pan bolts: 20 Nm
  • Timing chain tensioner bolts: 40 Nm
View full procedure

Suspension Bolt Torque Specifications

Outlines the proper torque values for suspension bolts on the 2011-2016 BMW 550i, ensuring optimal handling and stability.

  • Strut mounting bolts: 60 Nm
  • Control arm bolts: 100 Nm
  • Sway bar end links: 40 Nm
  • Tie rod ends: 50 Nm
  • Ball joints: 50 Nm
View full procedure
Technical Service Bulletins

Service Bulletin: Engine Bolt Failure

2015-05-01

Addresses potential engine bolt failures on the 2011-2014 550i, providing updated torque specifications and inspection procedures.

2011-2014 550i

Resolution: Inspect and replace engine bolts as necessary, torquing them to 80 Nm + 90 degrees + 90 degrees.

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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.
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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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