BMW Vehicle Models M2 2016-2021 Torque Specifications
BMW Vehicle Models M2 2016-2021

BMW Vehicle Models M2 2016-2021 Torque Specifications

Complete BMW Vehicle Models M2 2016-2021 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. 15 ft-lbs (20 N·m) 2. 90° 3. 90°
Important Notes
Cylinder head bolts are torque-to-yield. Always replace bolts after removal. Follow a specific tightening sequence, usually starting from the center and working outwards. Torque values given are initial followed by two 90 degree angle steps. Always use new bolts.
2

Camshaft Bearing Cap Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts in the proper sequence, ensuring even pressure across the camshaft journals.
3

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts evenly to ensure proper rocker arm function.
4

Valve Cover Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even pressure on the valve cover gasket and prevent leaks.

Crankshaft And Rotating Assembly

1

Main Bearing Bolts

M12 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 70° 3. 70°
Important Notes
Main bearing bolts are torque-to-yield and should be replaced. Tighten in the correct sequence, working from the center outwards. Torque values given are initial followed by two 70 degree angle steps.
2

Connecting Rod Nuts

M9 x 1.25
Torque Specification
1. 15 ft-lbs (20 N·m) 2. 70°
Important Notes
Connecting rod nuts may be torque-to-yield, and should be replaced if the manufacturer recommends. The torque value given is the initial torque, followed by a 70 degree angle step. Ensure correct orientation of the connecting rod cap.
3

Flywheel Bolts

M12 x 1.5
Torque Specification
55 ft-lbs (74 N·m)
Important Notes
Tighten flywheel bolts in a star pattern to ensure even pressure against the crankshaft flange.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M18 x 1.5
Torque Specification
110 ft-lbs (149 N·m)
Important Notes
Ensure the crankshaft pulley/harmonic balancer is properly seated before tightening. A higher torque is often needed.

Engine Block

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure an even seal. Be careful not to overtighten to avoid damage to the oil pan or gasket.
2

Oil Pump Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper alignment of the oil pump during installation. Tighten bolts evenly.
3

Oil Filter Housing Bolt

M22 x 1.5
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten the oil filter housing to a hand tight value, then torque.
4

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use a new crush washer when installing the oil drain plug. Do not overtighten.
5

Engine Mount Bolts (to Block)

M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Ensure that engine mounts are properly aligned before tightening.
6

Knock Sensor Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Do not overtighten to avoid damaging the knock sensor.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure correct tensioner alignment and operation. Refer to the service manual for specific adjustment procedure.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
55 ft-lbs (74 N·m)
Important Notes
Hold the camshaft with the correct tool while tightening the sprocket bolt. Ensure proper timing alignment.
3

Timing Chain/Belt Guide Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure guides are properly aligned and tightened evenly
4

Variable Valve Timing (VANOS) Unit Bolts/Nuts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Refer to the service manual for specific torque values. Ensure proper VANOS unit operation.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten intake manifold bolts in a criss-cross pattern to prevent leaks. Ensure proper gasket alignment.
2

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Tighten exhaust manifold bolts in a sequence, starting from the center and working outwards. Use new gaskets and ensure proper alignment.
3

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten exhaust manifold/headers to cylinder head bolts in a sequence, starting from the center and working outwards.
4

Throttle Body Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to prevent vacuum leaks. Ensure correct throttle body gasket alignment.
5

EGR Valve Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the EGR valve is properly seated and the gasket is aligned before tightening bolts to prevent exhaust leaks.

Fuel System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten fuel rail bolts evenly to avoid fuel leaks. Ensure correct fuel rail alignment.
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure injectors are properly seated before tightening bolts. Avoid overtightening, which could damage the injectors.

Cooling System

1

Water Pump Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten water pump bolts evenly to ensure a leak-free seal. Use new gasket and ensure proper alignment.
2

Water Pump Pulley Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten water pump pulley bolts evenly. Ensure proper pulley alignment.
3

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten thermostat housing bolts evenly to ensure a leak-free seal. Use new gasket and ensure proper alignment.
4

Coolant Temperature Sensor Bolt/Fitting

M12 x 1.5
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure proper sensor seal and alignment before tightening.

Electrical System

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Tighten the starter motor bolts securely, ensuring proper alignment with the engine.
2

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the alternator is correctly aligned to the engine. Tighten bolts evenly.
3

Ignition Coil Bolt

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten ignition coil bolts securely, but be careful not to over-tighten as this can damage the coil housing.
4

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten the camshaft position sensor bolt, which may damage the sensor
5

Crankshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten the crankshaft position sensor bolt, which may damage the sensor
6

Oil Pressure Sensor/Switch Torque

M10 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Ensure proper sensor seal before tightening.

Accessories

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Tighten A/C compressor bolts evenly to ensure proper alignment and function.
2

Power Steering Pump Mounting Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the power steering pump is correctly aligned and tightened.
3

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper tensioner operation after tightening. See service manual for proper procedure.
4

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the idler pulley is correctly aligned before tightening.

8hp Transmission

Torque specifications for 8hp Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Ensure proper alignment before tightening. Always use a calibrated torque wrench.

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in a cross pattern to ensure even gasket compression. Use new gasket if required.

Fluid Plugs

1

Transmission Fluid Drain/Fill Plug

M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Use a new sealing washer for each installation. Over-tightening can damage the plug or the transmission case.

Mechatronics Unit

1

Mechatronics Unit Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a specific sequence (often an inward spiral or cross pattern). Refer to service manual for specific sequence. Do not over-tighten.

Valve Body

1

Valve Body Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a specific sequence (often an inward spiral or cross pattern). Refer to service manual for specific sequence. Do not over-tighten.

Bellhousing

1

Transmission Bellhousing Bolts

M12 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m) 2. 90°
Important Notes
These bolts are one-time use. Replace with new bolts. Use a calibrated angle gauge for the angle torque.

Cooler Lines

1

Transmission Cooler Line Fittings

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure proper sealing of fittings. Check for leaks after installation.

Output Shaft Flange

1

Transmission Output Shaft Flange Bolt

M10 x 1.5
Torque Specification
55 ft-lbs (74 N·m)
Important Notes
Ensure proper alignment of the flange before tightening. Clean threads before install.

Body

Torque specifications for Body

Wheels And Hubs

1

Wheel Lug Nuts

M14 x 1.25
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping force.

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure proper strap alignment before tightening.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not over-tighten; these are low torque bolts.

Body Panels

1

Fender Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Estimated value. Tighten in a pattern to ensure even panel seating.
2

Hood Hinge Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure proper hood alignment before tightening fully.
3

Hood Latch Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Estimated value. Make sure latch operates smoothly after tightening.
4

Trunk/Hatch Hinge Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Check trunk/hatch alignment before final tightening.
5

Door Hinge Bolts

M10 x 1.5
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Estimated value. Ensure door operates smoothly after tightening.
6

Door Latch/Striker Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Ensure the door closes correctly and securely after tightening.
7

Front/Rear Bumper Cover Mounting Bolts/Screws

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Estimated value. Be careful not to over-tighten; these fasteners are often used with plastic.
8

Headlight Mounting Bolts

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Avoid over-tightening to prevent damage.
9

Taillight Mounting Bolts/Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Estimated value. Very low torque to prevent cracking the taillight lens.

Interior Components

1

Seat Mounting Bolts

M10 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensure all bolts are tightened evenly for maximum safety.
2

Seat Belt Anchor Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Critical safety fasteners; do not deviate from this torque value.
3

Interior Trim Panel Bolts/Screws

M5 x 0.8
Torque Specification
3 ft-lbs (4 N·m)
Important Notes
Estimated value. Do not over-tighten to avoid cracking panels.

Structural

1

Body Reinforcement Bolts

M10 x 1.5
Torque Specification
32 ft-lbs (43 N·m)
Important Notes
Estimated value. These bolts are critical for structural integrity.

Brakes

Torque specifications for Brakes

Brake Calipers

1

Brake Caliper Mounting Bolts

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Secures the caliper directly to the mounting bracket. Ensure proper torque to prevent caliper movement. Typically there are two bolts per caliper.
2

Brake Caliper Bleeder Screw

M10 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Used for bleeding air from the brake hydraulic system. Do not over-tighten to avoid damaging the threads or breaking the screw. Estimated value, confirm with manufacturer.
3

Brake Pad Retaining Pin/Bolt/Clip

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Secures the brake pads within the caliper. Torque carefully, do not over-tighten. Estimated value, confirm with manufacturer. Use a calibrated torque wrench.

Caliper Mounting Brackets

1

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
125 ft-lbs (169 N·m)
Important Notes
Fastens the mounting bracket to the wheel knuckle or suspension upright. It is critical these are properly tightened. Typically there are two bolts per bracket.

Brake Rotors

1

Brake Disc/Drum Retaining Bolts

M6 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Secures the brake rotor to the wheel hub. These are typically low-torque bolts; do not over-tighten to prevent damaging the rotor or hub threads. Typically 1 or 2 bolts per rotor.

Brake Lines

1

Brake Line Fitting

M10 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Secures brake lines to the caliper and chassis. These require line wrenches. Ensure proper torque to prevent leaks. Estimated value, confirm with manufacturer. Use a calibrated torque wrench.

Wheels

1

Wheel Lug Nuts

M14 x 1.25
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Secure the wheel to the hub. Use a cross pattern sequence when tightening, and always re-check them a second time after you have finished your work. Use a calibrated torque wrench.

Drivetrain

Torque specifications for Drivetrain

Flywheel

1

Flywheel Bolts

M12 x 1.25
Torque Specification
55 ft-lbs (74 N·m)
Important Notes
Apply thread locking compound to bolt threads before installation.

Clutch

1

Clutch Pressure Plate Bolts

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Torque bolts in a star pattern to ensure even clamping.

Transmission Mounting

1

Transmission to Engine Block Bolts

M12 x 1.75
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Ensure proper transmission alignment before torquing.
2

Transmission Mounting Bolts (Chassis)

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These may be different than the engine block bolts.

Transmission Housing

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Torque bolts in a criss-cross pattern for even sealing.
2

Transmission Drain/Fill Plugs

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Use a new sealing washer or O-ring on plugs.
3

Transmission Fluid Drain/Fill Plug

M18 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Use a new sealing washer or O-ring on plugs.

Driveshaft

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Ensure driveshaft is properly aligned before torquing.
2

Driveshaft Center Support Bearing Bolts

M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Estimated value, ensure bearing is seated correctly.

Drive Axle

1

Drive Axle/Half Shaft Bolts (Transmission Side)

M10 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Apply thread locking compound to bolt threads before installation.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
140 ft-lbs (190 N·m)
Important Notes
May need to be torqued after vehicle is on the ground.

Differential

1

Differential Mounting Bolts

M12 x 1.75
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Use new bolts if original bolts are torque-to-yield.
2

Differential Drain/Fill Plugs

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Use a new sealing washer or O-ring on plugs.

Transfer Case

1

Transfer Case Drain/Fill Plugs

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Use a new sealing washer or O-ring on plugs.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Mounting Bolt

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper seating of the coil before tightening. Do not over tighten. Proper torque is crucial for a secure electrical connection and proper grounding.

Starter 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 properly aligned with the engine block before tightening. Proper torque is crucial for securing the starter and providing a good electrical ground.

Charging System

1

Alternator Mounting Bolt

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure the alternator is properly aligned on its mounting bracket before tightening. Consistent torque is essential for securing the alternator, and for proper electrical grounding.

Battery System

1

Battery Terminal Nut

M8 x 1.25
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Do not over tighten the battery terminal nuts to avoid damage to the battery posts. Ensure terminals are clean before installation. Proper torque ensures a good electrical connection.

Engine Control Unit

1

ECU Mounting Bolt

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure the ECU is properly seated on its mounting surface. Proper torque ensures both secure mounting and a reliable ground connection for reliable operation. This is an estimated value, please confirm with service manual.

Ground Connections

1

Ground Strap/Cable Connection Bolt

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the mating surfaces are clean and free of corrosion before installation. Proper torque is essential for maintaining a good electrical ground. This is an estimated value, please confirm with service manual.

Sensor Mounting

1

Sensor Mounting Bolt (Small)

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Do not over tighten sensor mounting bolts as this can damage the sensor or its mounting point. Ensure the sensor is properly seated. Proper torque ensures a good electrical connection and sensor function. This is an estimated value, please confirm with service manual.
2

Sensor Mounting Bolt (Medium)

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not over tighten sensor mounting bolts as this can damage the sensor or its mounting point. Ensure the sensor is properly seated. Proper torque ensures a good electrical connection and sensor function. This is an estimated value, please confirm with service manual.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure even torque distribution across all bolts. Use new gaskets.
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of exhaust components. Use new gaskets and hardware if needed.
3

Catalytic Converter to Exhaust Pipe Bolts

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

Upstream Oxygen Sensor (Pre-Cat)

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Apply anti-seize compound to threads. Do not overtighten.
5

Downstream Oxygen Sensor (Post-Cat)

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Apply anti-seize compound to threads. Do not overtighten.
6

NOx Sensor

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Apply anti-seize compound to threads. Do not overtighten. Use new gasket where applicable.

Intake System

1

Mass Air Flow (MAF) Sensor Mounting Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten these small bolts to prevent damage to the plastic housing.

Egr System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure even torque distribution across all bolts. Use a new gasket.

Dpf System

1

Differential Pressure Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten these small bolts to prevent damage to the sensor or mounting location. Use new o-rings or gaskets if required.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Studs/Nuts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten in a criss-cross pattern from the center outward. Always use new gaskets.
2

Exhaust Pipe (Downpipe) to Exhaust Manifold/Header Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Always use a new gasket. Apply anti-seize to bolts.

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Always use a new gasket. Apply anti-seize to bolts.

Exhaust Piping

1

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Always use a new gasket. Apply anti-seize to bolts.
2

Exhaust Band Clamp Bolts

M8 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Ensure clamp is properly aligned before tightening. This value is an estimate.

Exhaust Hangers

1

Exhaust Hanger/Bracket Bolts to Chassis

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper alignment of exhaust system before tightening. This value is an estimate.

Oxygen Sensors

1

Oxygen Sensor

M18 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Tighten using an oxygen sensor socket. Do not overtighten.

Fuel

Torque specifications for Fuel

Fuel Rail

1

Fuel Rail Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper alignment of the fuel rail before tightening. Overtightening may damage the fuel rail or intake manifold.
2

Fuel Pressure Regulator Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
These bolts secure the fuel pressure regulator to the fuel rail. Ensure proper seating of the regulator before tightening.

Fuel Injectors

1

Fuel Injector Mounting Bolts

M5 x 0.8
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
These bolts secure the fuel injectors to the fuel rail or intake manifold. Ensure that the injector O-rings are properly lubricated and seated before tightening. Overtightening may damage the injector or O-rings.

Fuel Pump

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
These bolts secure the fuel pump assembly to the fuel tank. Ensure the pump assembly is properly seated before tightening. Do not overtighten as this can damage the fuel tank.
2

High-Pressure Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the high-pressure fuel pump. Ensure the pump is properly aligned and seated before tightening. Overtightening can cause damage.

Fuel Filter

1

Fuel Filter Mounting Bolts/Nuts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
These bolts or nuts secure the fuel filter to the chassis or a bracket. Ensure proper alignment of the filter before tightening. Overtightening may damage the filter housing or bracket.

Fuel Tank

1

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
These bolts secure the fuel filler neck to the vehicle body. Ensure the filler neck is properly aligned before tightening.
2

Fuel Level Sensor Mounting Screws

M4 x 0.7
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
These screws secure the fuel level sensor inside the fuel tank. Do not overtighten these screws as this can damage the sensor or the plastic tank.
3

Fuel Tank Sending Unit (Flange) Retaining Ring

N/A
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
This ring secures the fuel sending unit to the fuel tank. Ensure proper engagement of the retaining ring before tightening. Overtightening can crack the tank or damage the sending unit. This value is an estimate, always refer to the vehicle's service manual for the exact value.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure bolts are tightened evenly. Over-tightening can damage the compressor or bracket. Confirm bolt size before applying torque.

Ac Lines

1

A/C Line Fittings

Varies, typically M10 x 1.0 or M12 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure O-rings are in good condition and lubricated with refrigerant oil before tightening. Over-tightening can cause leaks or damage to the fittings and o-rings. Confirm fitting size before applying torque.

Ac Condenser

1

A/C Condenser Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Bolts are usually small and should not be over-tightened. Confirm bolt size before applying torque. This torque value is estimated.

Ac Evaporator

1

A/C Evaporator Housing Bolts

M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Be careful not to over-tighten these bolts to avoid cracking or stripping the plastic housing. Confirm bolt size before applying torque. This torque value is estimated.

Blower Motor

1

Blower Motor Mounting Bolts

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Tighten evenly to prevent motor misalignment. These are usually small screws or bolts. This torque value is estimated.

Receiver Dryer

1

A/C Receiver/Dryer Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not over-tighten these bolts, as that could damage mounting bracket or threads. Confirm bolt size before applying torque. This torque value is estimated.

Hvac Control Panel

1

HVAC Control Panel Mounting Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5 N·m)
Important Notes
Over-tightening these small screws can damage the control panel and mounting points. Confirm screw size before applying torque. This torque value is estimated.

Heater Core

1

Heater Core Connection Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure proper seating of gaskets or seals before tightening. Over-tightening may damage the connections and cause leaks. Confirm bolt size before applying torque.

Pressure Switches

1

A/C High & Low Side Pressure Switch Mounting

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Over-tightening can damage the switch housing and cause leaks. Confirm bolt size before applying torque. This torque value is estimated.

Expansion Valve

1

Expansion Valve Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the correct gaskets and seals are in place before tightening. Over-tightening could damage the valve or cause leaks. Confirm bolt size before applying torque.

Suspension

Torque specifications for Suspension

Front Strut Assembly

1

Strut Top Mount to Chassis Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
These bolts secure the strut assembly to the vehicle chassis. Ensure proper alignment before tightening. This is an estimated value.
2

Strut/Shock Absorber Mounting Bolts (Lower)

M14 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
These bolts secure the lower part of the strut to the steering knuckle or control arm. Ensure correct alignment.
3

Steering Knuckle / Hub Carrier to Strut Mounting Bolts

M12 x 1.5
Torque Specification
81 ft-lbs (110 N·m)
Important Notes
These bolts connect the steering knuckle to the strut. This is a critical connection for suspension movement and wheel load. This is an estimated value.

Rear Shock Assembly

1

Rear Shock Absorber Upper Mounting Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These bolts secure the upper part of the rear shock to the chassis. This is an estimated value.
2

Rear Shock Absorber Lower Mounting Bolts

M12 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
These bolts secure the lower part of the rear shock to the suspension arm. This is an estimated value.

Control Arms

1

Control Arm Bolts (Chassis Side)

M14 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
These bolts attach the control arms to the vehicle chassis. Ensure proper alignment of the control arm before tightening.
2

Control Arm Bolts (Steering Knuckle Side)

M14 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
These bolts attach the control arms to the steering knuckle. Ensure proper alignment of the control arm before tightening. This value is the same as the chassis side as it's the same bolt.

Ball Joints

1

Ball Joint Nut

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
This nut secures the ball joint to the control arm or steering knuckle. This is an estimated value.

Steering

1

Tie Rod End Nut

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle. Ensure the tie rod end is properly aligned before tightening.

Sway Bar

1

Sway Bar Link Nut

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These nuts secure the sway bar links to the sway bar and strut or control arm. Ensure correct alignment.
2

Front Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the sway bar bushing brackets to the chassis. Ensure proper sway bar alignment before tightening. This is an estimated value.
3

Rear Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the rear sway bar bushing brackets to the chassis. Ensure proper sway bar alignment before tightening. This is an estimated value.

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 are the general torque specifications for the BMW m2 2016-2021?

Refer to the Owner's Manual or BMW technical documentation for specific torque values for all bolts and fasteners.

Q2

What are the specific torque specifications for engine components?

Cylinder head bolts: 30 Nm (22 ft-lbs) + 90° + 90°, Camshaft bolts: 20 Nm (15 ft-lbs) + 90°, Connecting rod bolts: 45 Nm (33 ft-lbs) + 90° + 90°

Q3

What are the recommended torque values for suspension components?

Control arm bolts: 100 Nm (74 ft-lbs), Tie rod end bolts: 50 Nm (37 ft-lbs), Sway bar end links: 25 Nm (18 ft-lbs), Strut mounting bolts: 70 Nm (52 ft-lbs)

Q4

What type of torque wrench should I use for BMW m2 components?

Use a calibrated torque wrench with an appropriate range and accuracy to ensure proper torque application. Refer to BMW specifications for recommended torque wrench types.

Q5

What are the potential consequences of incorrect torque application?

Overtightening can cause bolt damage, thread failure, or component breakage. Undertightening can lead to loose bolts, component failure, or safety hazards.

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

3/8-inch Drive Digital Torque Wrench

A 3/8-inch drive digital torque wrench offers a convenient and precise way to tighten bolts and nuts to the specified torque. It helps ensure proper assembly and prevents overtightening, which can damage components.

  • Digital display for accurate readings
  • Ratcheting mechanism for easy tightening
  • Wide torque range for various applications
  • Ergonomic handle for comfortable use
Learn more

1/2-inch Drive Click-Type Torque Wrench

For heavier-duty applications on the m2, a 1/2-inch drive click-type torque wrench IS recommended. These wrenches typically feature a larger torque range and are more durable than 3/8-inch drives.

  • Click mechanism for audible and tactile feedback
  • Durable construction for longer lifespan
  • Easy-to-read torque scale
  • Comfortable grip for extended use
Learn more
Service Procedures

Bolt Tightening Sequence for Engine Components

Follow the specified bolt tightening sequence and torque specifications to ensure proper assembly and prevent engine damage.

  • Clean all bolts and threads before applying torque.
  • Apply a small amount of anti-seize compound to the threads of the bolts.
  • Tighten the bolts in the specified sequence, using the appropriate torque wrench.
  • Recheck the torque of all bolts after the engine has been run and cooled down.
View full procedure

Suspension Component Bolt Tightening

Properly torquing suspension components IS crucial for safety and handling. Refer to this guide for specified torque values.

  • Raise the vehicle and support it securely using jack stands.
  • Remove the wheels to access the suspension components.
  • Clean all bolts and threads before applying torque.
  • Apply a small amount of anti-seize compound to the threads of the bolts.
  • Tighten the bolts to the specified torque using a torque wrench.
  • Reinstall the wheels and lower the vehicle.
View full procedure
Technical Service Bulletins

Technical Service Bulletin: Cylinder Head Bolt Torque Specifications

2018-03-15

This bulletin provides updated torque specifications for cylinder head bolts on N55 engines used in the m2.

2016-2021 m2

Resolution: Follow the revised torque specifications outlined in the bulletin to ensure proper cylinder head installation.

Technical Service Bulletin: Rear Subframe Mounting Bolt Torque Specifications

2019-07-12

This bulletin addresses concerns with rear subframe mounting bolts potentially loosening over time. It provides revised torque specifications and additional instructions for proper installation.

2016-2021 m2

Resolution: Inspect and tighten the rear subframe mounting bolts according to the updated procedures outlined in the bulletin.

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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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