BMW Vehicle Models i3 2014-present Torque Specifications
BMW Vehicle Models i3 2014-present

BMW Vehicle Models i3 2014-present Torque Specifications

Complete BMW Vehicle Models i3 2014-present torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. Essential information for proper assembly and maintenance.

Updated

Important Information

Safety guidelines and reference information for proper torque application

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

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

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

Used for gaskets and cover plates

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

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

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

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

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

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

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

Prevention:

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

Reusing TTY Bolts

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

Prevention:

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

Dry vs. Lubricated

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

Prevention:

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

Recommended Tools

Torque Wrench (1/4" Drive)

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

Torque Wrench (3/8" Drive)

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

Torque Wrench (1/2" Drive)

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

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

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

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Search by component name, bolt size, or description

Torque Calculator

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Body

Torque specifications for Body

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures fuel tank straps to the chassis. Proper torque prevents tank movement and potential leaks.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Attaches the fuel filler neck to the body. Proper torque ensures a leak-proof seal.

Door System

1

Door Hinge Bolts (to Body) - M8

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures door hinge to the body. Proper torque is critical for door alignment and smooth operation. Some vehicles use TTY bolts which must be replaced.
2

Door Hinge Bolts (to Body) - M10

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Secures door hinge to the body. Proper torque is critical for door alignment and smooth operation. Some vehicles use TTY bolts which must be replaced.

Fender System

1

Fender Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the fender to the vehicle body. Proper torque prevents vibration and ensures proper alignment. Some vehicles use TTY bolts which must be replaced.

Hood System

1

Hood Hinge Bolts (to Body) - M8

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures hood hinge to the body. Proper torque ensures hood alignment and smooth operation. Some vehicles use TTY bolts which must be replaced.
2

Hood Hinge Bolts (to Body) - M10

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Secures hood hinge to the body. Proper torque ensures hood alignment and smooth operation. Some vehicles use TTY bolts which must be replaced.
3

Hood Latch Bolt (to Hood)

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Attaches the hood latch to the hood. Proper torque ensures the hood latch will function correctly.

Bumper System

1

Bumper Mounting Bolts - M8

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures bumper to the vehicle body. Proper torque is essential for bumper stability and safety.
2

Bumper Mounting Bolts - M10

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Secures bumper to the vehicle body. Proper torque is essential for bumper stability and safety.

Lighting System

1

Headlight Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Attaches the headlight assembly to the body. Proper torque prevents misalignment and ensures secure fit.
2

Taillight Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secures the taillight assembly to the body. Proper torque prevents movement and ensures secure fit.

Body Panels Trim

1

Interior Trim Mounting Screws

M4 x 0.7
Torque Specification
3.5 ft-lbs (5 N·m)
Important Notes
Attaches interior plastic trim panels. Proper torque prevents cracking and ensures secure fit.
2

Exterior Trim Mounting Screws

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Attaches exterior trim panels and covers. Proper torque prevents looseness and vibration.

Seating System

1

Seat Mounting Bolts (to Floor)

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Secures seats to the vehicle floor. Proper torque is critical for safety. Some vehicles use TTY bolts which must be replaced.

Seatbelt System

1

Seat Belt Mounting Bolts/Nuts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Secures seat belts to the vehicle body. These bolts are critical for safety. Some vehicles use TTY bolts which must be replaced.

Sunroof System

1

Sunroof Frame Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Attaches the sunroof frame to the vehicle body. Proper torque ensures proper sealing and operation of the sunroof.

Brakes

Torque specifications for Brakes

Caliper Mounting

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Secures the brake caliper directly to the caliper mounting bracket. High-strength bolts are used, and proper torque is essential for brake performance and safety.
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
118 ft-lbs (160 N·m)
Important Notes
Secures the caliper mounting bracket to the vehicle's hub or steering knuckle. This is a critical connection that must withstand significant braking forces.

Rotor Mounting

1

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures the brake disc (or drum) to the wheel hub. Ensures the disc runs true without vibration or damage.

Wheel Mounting

1

Wheel Lug Nuts

M14 x 1.25
Torque Specification
88 ft-lbs (120 N·m)
Important Notes
Secures the wheel to the hub. Correct torque is critical to prevent brake rotor warpage and ensure even braking forces.

Brake Pad Hardware

1

Brake Pad Retaining Pin/Bolt

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Secures the brake pads within the caliper body, preventing shifting or rattling. Estimated value, verify with BMW-specific guidelines.

Brake Lines

1

Brake Line Banjo Bolt

M10 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Secures the brake line to the caliper or other components. Ensures a leak-free connection without damaging fittings. Estimated value, verify with BMW-specific guidelines.

Bleeder Screws

1

Brake Caliper Bleeder Screw

M7 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensures a leak-free seal without damaging threads. Hand-tighten first, then torque with a small torque wrench. Estimated value, verify with BMW-specific guidelines.

Drivetrain

Torque specifications for Drivetrain

Engine Flywheel

1

Flywheel Bolts

M12 x 1.25
Torque Specification
1. 22 ft-lbs (30 N·m)
Important Notes
Torque in a star pattern. Always use new bolts. Ensure mating surfaces are clean and free of debris.

Transmission Mounting

1

Transmission Mounting Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure proper alignment before tightening. Tighten all bolts evenly.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Tighten in a criss-cross pattern. Use a new gasket or sealant as needed.
3

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Use new crush washers. Do not over tighten.

Drive Axle

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Ensure proper alignment of the axle. Tighten all bolts evenly.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
147 ft-lbs (200 N·m)
Important Notes
Use a new nut if specified by the manufacturer. Ensure proper seating of the axle into the wheel hub.

Propeller Shaft

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Ensure proper alignment of the driveshaft and flanges. Tighten all bolts evenly.

Differential

1

Differential Drain/Fill Plug

M18 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Use new crush washers. Do not over tighten.
2

Final Drive Mounting Bolts

M12 x 1.75
Torque Specification
66 ft-lbs (90 N·m)
Important Notes
Ensure proper alignment of the final drive. Tighten all bolts evenly. Estimated value.

Transfer Case

1

Transfer Case Drain/Fill Plug

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

Electric Motor

1

Electric Motor Mounting Bolts

M16 x 2.0
Torque Specification
52 ft-lbs (70 N·m)
Important Notes
Always refer to the motor manufacturer's recommended torque specification as they can vary. Estimated value.
2

Inverter Module Mounting Bolts

M8 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment. Tighten evenly.

Electric Motor

Torque specifications for Electric Motor

Powertrain Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure proper alignment before tightening. Use a cross-tightening pattern.
2

Electric Motor Mounting Bolts (to Transmission Housing/Motor Mount)

M10 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Estimated torque value for M10 bolts. Ensure proper seating before torquing. Use a cross-tightening pattern.

Drive System

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Ensure the axle is properly seated before tightening. Use a cross tightening pattern.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
147 ft-lbs (200 N·m)
Important Notes
Ensure the nut is new or in perfect condition, and the axle is properly seated. Use a new nut if available and never reuse old nuts.

Motor Components

1

Electric Motor Stator Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Use a cross-tightening pattern. Ensure proper seating of stator components before tightening.
2

Electric Motor Rotor Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Use a cross-tightening pattern. Ensure proper seating of rotor components before tightening.

High Voltage System

1

High Voltage Battery Connector Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Torque is critical for high voltage connections. Use a calibrated torque wrench. Ensure connections are clean and free of corrosion. This is an average torque for M6 bolts, but it is crucial to verify this with the manufacturer's specs.
2

Inverter Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the inverter is correctly positioned before tightening. Use a cross-tightening pattern.

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 mating surfaces are clean before installation. Do not overtighten.

Starter System

1

Starter Motor Mounting Bolt

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Proper torque is crucial for secure mounting and electrical grounding. Ensure bolt threads are clean.

Alternator System

1

Alternator Mounting Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment during installation. Torque must be accurate for belt tension.

Battery System

1

12V Battery Terminal Nut

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Do not overtighten; this could damage the terminal or battery post. Ensure clean connections.
2

High Voltage Battery Module Mounting Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Follow a specific torque sequence from the service manual, usually a cross pattern. This maintains even pressure and thermal contact.

Power Electronics

1

Inverter/Power Electronics Mounting Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper electrical ground contact. Cleanliness is important for good contact and torque accuracy.

Electric Motor

1

Electric Motor Mounting Bolt

M12 x 1.75
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Follow a cross pattern torque sequence for even clamping. Ensure all mounting surfaces are clean. Multiple steps may be required, see service manual.

Hv Cable Connections

1

HV Cable Terminal Bolt

M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated value, actual torque varies based on connection type and size. Always verify based on the service manual. Ensure contact surfaces are clean.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold to Cylinder Head Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure even tightening to prevent leaks. Apply anti-seize compound to the bolt threads. A multi-step tightening pattern may be recommended. Check for exhaust leaks after installation.
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Use new gaskets. Ensure proper alignment of the exhaust pipe to manifold. Tighten evenly to avoid leaks. Check for exhaust leaks after installation.
3

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Use new gaskets. Make sure the catalytic converter is correctly aligned. Check for exhaust leaks after installation.
4

Oxygen Sensor (O2 Sensor) Mounting

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
This is an estimated value. Some O2 sensors may have specific torque requirements, refer to sensor spec sheet. Do not over-tighten. Ensure the threads are clean. Apply anti-seize compound to the sensor threads.
5

NOx Sensor Mounting

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
This is an estimated value, refer to sensor spec sheet. Do not over-tighten. Ensure threads are clean. Apply anti-seize compound to the sensor threads. Some sensors may use a retaining bracket.

Intake System

1

Mass Air Flow (MAF) Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not over-tighten. Ensure proper sealing of the MAF sensor to intake. Use a torque wrench to ensure accuracy.
2

Intake Air Temperature (IAT) Sensor Mounting (threaded)

M12 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
This is an estimated value. Do not over-tighten. Ensure the threads are clean. Apply anti-seize compound to sensor threads.

Egr System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Use new gaskets. Tighten evenly to prevent leaks. Check for leaks after installation. A cross pattern tightening pattern may be recommended.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in a star pattern to ensure even clamping pressure. Always use new gaskets.

Exhaust Piping

1

Exhaust Pipe to Exhaust Manifold/Header Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure proper alignment of the exhaust pipe to the manifold. Use new gaskets and tighten evenly in a cross pattern.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Use new gaskets. Tighten bolts evenly in a cross pattern to prevent leaks.
3

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Use new gaskets and tighten evenly to prevent exhaust leaks.

Exhaust Mounting

1

Exhaust Hanger/Mount Bolts to Chassis

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper alignment of the exhaust system and hangers before tightening. This is an estimated value based on similar M8 fasteners. Always use proper hardware.

Oxygen Sensors

1

Oxygen Sensor Torque

M18 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure the sensor threads are clean. Do not over-tighten to avoid damage to the sensor or threads.

Fuel

Torque specifications for Fuel

Fuel Rail

1

Fuel Rail Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the fuel rail to the intake manifold or cylinder head. Ensure proper torque to prevent fuel leaks and maintain system integrity.
2

Fuel Injector Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the fuel injectors to the fuel rail or intake manifold. Proper torque ensures proper sealing and prevents leaks at the injector mounting point.
3

Fuel Pressure Sensor Bolt/Nut

M5 x 0.8
Torque Specification
8.5 ft-lbs (12 N·m)
Important Notes
Secures the fuel pressure sensor to the fuel rail or fuel line. Estimated value based on typical sensor mounting bolts. Do not overtighten.

Fuel Pump And Tank

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the fuel pump assembly to the fuel tank or pump mounting bracket. Correct torque ensures a secure and leak-free installation.
2

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the straps that hold the fuel tank to the vehicle's undercarriage. Correct torque is vital for preventing the tank from shifting or falling.
3

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
These bolts attach the fuel filler neck to the vehicle's body, and secure the neck to the tank itself. A proper torque is required to prevent leaks and damage.
4

Fuel Tank Sending Unit Retaining Ring

N/A
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Secures the fuel tank sending unit to the fuel tank. Many manufacturers use a tool that measures the amount of rotational force needed in Newton meters. Estimated torque based on similar sized retaining rings. Ensure proper tool usage.

Fuel Filter And Lines

1

Fuel Filter Bolt/Nut

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secures the fuel filter housing or the filter itself. Correct torque is needed to prevent fuel leaks at the filter and ensure proper sealing.
2

Fuel Line Fittings (High Pressure)

Varies
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque value for high-pressure fuel line fittings. Can vary depending on size and material. This value is an estimate. Refer to the specific manual for your vehicle's fuel fittings.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure compressor is properly aligned before tightening. Use new bolts if specified.

Ac Lines And Fittings

1

A/C Line Fittings

Varies by location, typically M10 x 1.5 or M12 x 1.75
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Use new o-rings or seals. Do not overtighten. Check for leaks after charging.

Ac Condenser

1

A/C Condenser Mounting Bolts/Screws

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Estimated value. Confirm with vehicle specific service manual. Be careful not to overtighten the smaller bolts.

Ac Evaporator

1

A/C Evaporator Housing Bolts/Screws

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Confirm with vehicle specific service manual. Be careful not to overtighten the smaller screws into plastic.
2

A/C Expansion Valve Mounting Bolts/Screws

M5 x 0.8
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Confirm with vehicle specific service manual. Be careful not to overtighten the smaller screws into the evaporator housing.

Hvac Control Module

1

HVAC Control Module Mounting Screws

M4 x 0.7
Torque Specification
4 ft-lbs (6 N·m)
Important Notes
Estimated value. Confirm with vehicle specific service manual. Be careful not to overtighten the very small screws into plastic.

Blower Motor

1

Blower Motor Mounting Screws

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Estimated value. Confirm with vehicle specific service manual. Be careful not to overtighten the screws into the plastic housing.

Heater Core

1

Heater Core Inlet/Outlet Pipe Connection Bolts

M6 x 1.0
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated value. Confirm with vehicle specific service manual. Some connections may use clamps or quick-connects, do not over-tighten bolts on pipe flanges.

Blend Door Actuator

1

Blend Door Actuator Mounting Screws

M4 x 0.7
Torque Specification
2.5 ft-lbs (3.5 N·m)
Important Notes
Estimated value. Confirm with vehicle specific service manual. Be careful not to overtighten the small screws into the plastic housing.

None Transmission

Torque specifications for None Transmission

Engine Block and Cylinder Head

1

Cylinder Head Bolts

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

Engine Block to Engine Mounting Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Estimated value, not explicitly listed in the manual.

Intake and Exhaust Manifolds

1

Intake Manifold Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
2

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
26 ft-lbs (35 N·m)

Fuel System

1

Fuel Rail Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)

Brake System

1

Brake Caliper Bolts

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
2

Brake Caliper Mounting Bracket Bolts

M16 x 1.5
Torque Specification
118 ft-lbs (160 N·m)

Suspension and Steering

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
96 ft-lbs (130 N·m)
2

Control Arm Bolts

M16 x 1.5
Torque Specification
111 ft-lbs (150 N·m)

Suspension

Torque specifications for Suspension

Front Strut Assembly

1

Strut to Steering Knuckle Pinch Bolt

M14 x 1.5
Torque Specification
77 ft-lbs (105 N·m)
Important Notes
Secures the steering knuckle around the bottom of the strut. Critical for front suspension integrity.
2

Upper Strut Mount Nuts to Body

M8 x 1.25
Torque Specification
32 ft-lbs (43 N·m)
Important Notes
Secures the upper strut mount to the vehicle body. Typically uses three nuts.

Front Control Arm

1

Control Arm Bolts to Chassis/Subframe

M12 x 1.5
Torque Specification
111 ft-lbs (150 N·m)
Important Notes
Secures the control arm to the vehicle's chassis or subframe. Critical for maintaining suspension geometry.
2

Ball Joint Nut

M12 x 1.75
Torque Specification
52 ft-lbs (70 N·m)
Important Notes
Secures the ball joint to the control arm or steering knuckle. Ensure proper seating before tightening.

Front Steering

1

Tie Rod End Nut

M10 x 1.25
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Secures the tie rod end to the steering knuckle. Critical for steering alignment and responsiveness.

Front Subframe

1

Front Subframe Mounting Bolts

M14 x 2.0
Torque Specification
1. 90 ft-lbs (122 N·m) 2. 90°
Important Notes
These bolts mount the subframe to the chassis. Use new bolts for reassembly. Torque to spec, then tighten an additional 90 degrees. One time use bolts.

Rear Suspension

1

Rear Shock Absorber Lower Mounting Bolt

M12 x 1.5
Torque Specification
81 ft-lbs (110 N·m)
Important Notes
Secures the lower end of the shock absorber to the control arm or chassis.
2

Rear Control Arm Inner Bolt

M12 x 1.5
Torque Specification
111 ft-lbs (150 N·m)
Important Notes
Secures the inner mounting point of the rear control arm to the chassis. Critical for proper wheel alignment.

Sway Bar

1

Sway Bar Link Nut

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Connects the sway bar link to the sway bar and control arm/strut assembly. Correct torque ensures proper sway bar function.
2

Sway Bar Mounting Bracket Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Secures the sway bar to the chassis via the mounting brackets. Ensures the sway bar is properly secured for optimal performance.

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 recommended torque specifications for the BMW i3 wheel bolts?

Tighten the wheel bolts to 120 Nm (88 lb-ft) using a torque wrench.

Q2

What IS the proper sequence for tightening the wheel bolts on a BMW i3?

Follow a star pattern to tighten the wheel bolts in a sequential order. Start with one bolt and move to the opposite bolt, then to the next bolt in that order.

Q3

Can I use an impact wrench to tighten the wheel bolts on a BMW i3?

No, using an impact wrench can overtighten and damage the wheel bolts. Always use a torque wrench to achieve the specified torque.

Q4

What are the torque specifications for the BMW i3 suspension components?

Control arm bolts: 90 Nm (66 lb-ft), sway bar bolts: 60 Nm (44 lb-ft), strut bolts: 120 Nm (88 lb-ft), and tie rod bolts: 60 Nm (44 lb-ft).

Q5

What are the torque specifications for the BMW i3 brake components?

Caliper bolts: 110 Nm (81 lb-ft), rotor bolts: 10 Nm (7 lb-ft), and brake hose bolts: 25 Nm (18 lb-ft).

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.

  • Digital display for accurate torque readings
  • Audible and visual alert when target torque IS reached
  • Multiple torque units (Nm, ft-lb, in-lb)
  • Reversible ratcheting mechanism
Learn more

Torque Multiplier for High Torque Applications

Suitable for tightening large bolts or removing stubborn ones, ensuring high torque IS applied safely.

  • Amplifies torque applied to the bolt
  • Compact design fits in tight spaces
  • Durable construction for demanding use
Learn more
Service Procedures

Wheel Lug Nuts Tightening Procedure

Step-by-step instructions for proper wheel lug nut tightening on the BMW i3.

  • Clean the lug nuts and wheel mounting surfaces.
  • Apply anti-seize compound to the threads of the lug nuts.
  • Tighten the lug nuts to 110 Nm (81 ft-lb) using a torque wrench.
  • Double-check the tightness of the lug nuts regularly.
View full procedure

Suspension Component Torque Specifications

Comprehensive guide to torque values for various suspension components, including control arms, ball joints, and tie rods.

  • Refer to the BMW i3 repair manual for specific torque values.
  • Use a torque wrench to tighten bolts and nuts to the specified torque.
  • Follow the recommended tightening sequence to ensure proper suspension alignment.
View full procedure
Technical Service Bulletins

Torque Specifications for Engine Mounts

2019-03-15

Technical Service Bulletin addressing updated torque specifications for engine mounts on 2014-2016 BMW i3 models.

2014-2016 i3

Resolution: Update engine mount torque values to 50 Nm (37 ft-lb) for the upper mount and 65 Nm (48 ft-lb) for the lower mount.

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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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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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