BMW Vehicle Models 850i 2018-present Torque Specifications
BMW Vehicle Models 850i 2018-present

BMW Vehicle Models 850i 2018-present Torque Specifications

Complete BMW Vehicle Models 850i 2018-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

Convert between different torque units

4.4l Engine

Torque specifications for 4.4L 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
Tighten bolts in a specified sequence. First torque to specified value, then turn to specified angle for each step.
2

Cylinder Head Cover Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to avoid damaging the valve cover gasket.
3

Camshaft Position Sensor Bolt

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
4

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts evenly to ensure correct rocker arm alignment.
5

Variable Valve Timing (VVT) Solenoid Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten the bolts carefully to avoid damaging the solenoid housing.
6

Spark Plugs

M14 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure spark plugs are installed squarely to avoid cross-threading. Use anti-seize if necessary.

Engine Block

1

Main Bearing Bolts

M14 x 1.5
Torque Specification
1. 60 ft-lbs (81 N·m) 2. 60°
Important Notes
Tighten main bearing bolts in specified sequence. First torque to specified value then tighten to specified angle.
2

Connecting Rod Nuts

M9 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure connecting rod cap is correctly positioned before tightening.
3

Oil Pan Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to avoid warping the oil pan.
4

Knock Sensor Bolt

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Torque to spec to ensure proper sensor readings.
5

Coolant Temperature Sensor Bolt

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Do not over-tighten to avoid damaging sensor
6

Oil Pressure Sensor Bolt

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Torque to spec to ensure accurate readings.
7

Water Pump Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to ensure proper sealing.
8

Oil Filter Housing Bolt

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Hand tight and snug.
9

Oil Drain Plug

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Use a new crush washer for proper sealing.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure proper seal.
2

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Tighten bolts in a criss-cross pattern to ensure even sealing. May require a specific sequence.
3

EGR Valve Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to ensure proper sealing.
4

Throttle Body Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to avoid leaks.
5

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten bolts evenly to ensure a proper coolant seal.

Fuel System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure fuel rail is seated properly before tightening.
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Be careful not to over tighten and damage injector.
3

Fuel Injector Rail Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to prevent leaks.

Timing And Drive

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure tensioner is correctly positioned before tightening.
2

Camshaft Sprocket Bolt

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure camshaft sprocket is correctly aligned before tightening.
3

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 2.0
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Use correct torque to avoid vibration issues. May require additional angle torque.
4

Water Pump Pulley Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten evenly to ensure pulley runs true.
5

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure tensioner is properly aligned.
6

Drive Belt Idler Pulley Bolt

M10 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure correct alignment for proper belt tracking.

Starter Alternator Ac

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure proper starter motor alignment.
2

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Tighten evenly to ensure correct alignment.
3

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure proper alignment to avoid vibrations.

Ignition

1

Ignition Coil Bolt

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten to the specified torque for secure mounting.

Flywheel

1

Flywheel Bolts

M12 x 1.75
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure correct bolt length and that the flywheel is flush against crankshaft flange.

8hp Transmission

Torque specifications for 8hp Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.75
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Secures the transmission to the chassis or subframe. Ensure proper alignment before tightening. May need to be tightened in multiple passes.
2

Transmission Mount Bracket Bolts

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Secures the transmission mount brackets to the transmission case. These bolts may have a different specification than the through bolts.

Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Use new gasket. Tighten bolts in a criss-cross pattern starting from the center, moving outwards to avoid leaks. Do not overtighten as this can damage the pan or gasket.

Fluid Plugs

1

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Always use a new crush washer. Do not overtighten to avoid damage to the case threads.

Mechatronics Unit

1

Mechatronics Unit Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a specific sequence provided in the vehicle-specific manual to ensure proper alignment. This is a very sensitive component.

Valve Body

1

Valve Body Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a specific sequence, typically from center outwards, to avoid warping or leaks. Incorrect tightening can cause valve sticking or leaks.

Cooler Lines

1

Transmission Cooler Line Fittings

M16 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Tighten these fittings to prevent leaks. Do not overtighten. Use new O-rings when installing fittings.

Bellhousing

1

Bellhousing Bolts

M12 x 1.75
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
May vary based on specific application. Verify with OEM service manual. Tighten in a sequence to ensure proper seating.

Torque Converter

1

Torque Converter Bolts

M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Tighten in a sequence to ensure even pressure on the flexplate/flywheel and the torque converter. Failure to do so can cause vibrations or component damage.

Oil Pump

1

Oil Pump Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a specific sequence. Incorrect tightening can affect transmission performance.

Output Flange

1

Output Flange Nut

M24 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Tighten to specification to ensure proper mating with the driveshaft.

Body

Torque specifications for Body

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure straps are properly positioned before tightening. Overtightening can damage the tank or straps.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the filler neck is properly aligned to the fuel door and the fuel tank opening. Overtightening can damage the neck or the vehicle body.

Body Panels

1

Hood Hinge Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper hood alignment before fully tightening the bolts. Overtightening can distort the hood or body panel.
2

Fender Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure proper panel alignment before fully tightening the bolts. Overtightening can distort the fender or body panel.
3

Door Hinge Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure proper door alignment before fully tightening the bolts. Overtightening can damage the hinge or body panel.
4

Door Latch/Striker Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the door latches properly before fully tightening. Adjustment may be required for proper engagement.
5

Bumper Cover/Fascia Mounting Bolts/Fasteners

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Plastic fasteners may have a 'hand-tight' specification, do not over tighten. Ensure proper alignment of the fascia before tightening.

Lighting

1

Headlight/Taillight Mounting Bolts

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Do not over-tighten as this can damage the light housings. Ensure proper alignment with surrounding body panels.

Trim And Accessories

1

Body Side Molding Bolts/Fasteners

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Ensure proper alignment before fully tightening. Do not over-tighten plastic fasteners.
2

Grille Mounting Bolts/Fasteners

M5 x 0.8
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Ensure the grille is properly aligned before tightening the mounting hardware. Do not over-tighten plastic fasteners.
3

Mirror Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure mirror is properly positioned before tightening. Overtightening can damage the mirror or the door panel.

Electrical

1

Battery Terminal Nuts

M8 x 1.25
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Do not over-tighten. Proper torque ensures a good electrical connection.

Brakes

Torque specifications for Brakes

Caliper Mounting

1

Caliper Mounting Bolts

M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Secures the brake caliper directly to the mounting bracket. Ensure bolts are clean and threads are in good condition.
2

Caliper Mounting Bracket Bolts

M12 x 1.75
Torque Specification
120 ft-lbs (162 N·m)
Important Notes
Attaches the caliper mounting bracket to the wheel hub or knuckle. This is a critical connection point. Ensure all threads are clean. Apply a small amount of anti-seize to threads if needed.

Brake Rotor

1

Brake Rotor Retaining Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the brake rotor to the wheel hub. Ensure the rotor is flush against the hub before tightening.
2

Brake Rotor Set Screw

M6 x 1.0
Torque Specification
7 ft-lbs (9 N·m)
Important Notes
Small set screw used to hold the rotor in place during assembly, not to secure it during use. Do not over-tighten as the head can be damaged.

Brake Pad

1

Brake Pad Guide Pins/Bolts (Front & Rear)

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Secures the brake pads within the caliper. Do not over-tighten these as this can bind the pads or cause uneven wear.

Brake Lines

1

Brake Line/Hose Banjo Bolt

M10 x 1.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Secures the brake hydraulic lines to the caliper. Always replace sealing washers. Be very careful not to over-tighten and risk damaging the bolt or washers.
2

Brake Bleeder Screw

M7 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Used to bleed the brake system, tighten to specification if replaced during brake service. Do not over-tighten as this can damage the threads.

Drivetrain

Torque specifications for Drivetrain

Engine Flywheel

1

Flywheel Bolts

M12 x 1.25
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping pressure. Lubricate bolt threads with a light oil before installation.

Transmission Mounting

1

Transmission to Engine Bolts

M10 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Torque varies based on bolt size and material. Use specified size for the vehicle.
2

Transmission Mounting Bolts (Chassis)

M12 x 1.75
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Ensure proper transmission alignment before tightening.

Transmission Service

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Tighten in a cross pattern to ensure even gasket compression. Do not overtighten.
2

Transmission Drain and Fill Plugs

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

Drive Axles

1

Drive Axle/Half Shaft Bolts (Transmission/Differential Side)

M10 x 1.25
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Tighten in a cross pattern to ensure even clamping. Use new bolts if specified by the manufacturer.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
180 ft-lbs (244 N·m)
Important Notes
This nut is critical for retaining the wheel hub assembly. Ensure the nut is properly torqued to prevent wheel detachment or joint failure.

Driveshaft

1

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Tighten evenly in a cross pattern. Check for any looseness after a short drive.
2

Center Support Bearing Bolts/Nuts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Torque value is estimated. Specific value may vary. Ensure proper alignment of bearing during installation.

Differential

1

Differential Mounting Bolts

M12 x 1.75
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Ensure proper alignment of differential before tightening.
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 each time the plugs are removed.
3

Input Shaft/Pinion Flange Nut

M22 x 1.5
Torque Specification
140 ft-lbs (190 N·m)
Important Notes
Ensure proper bearing preload. Torque value estimated; consult manual for specific model.
4

Ring Gear Bolts

M12 x 1.25
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Tighten in a star pattern to ensure even clamping pressure. May require a final angle torque step.

Transfer Case

1

Transfer Case Drain/Fill Plugs

M18 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Use a new sealing washer or O-ring each time the plugs are removed.

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. Over-tightening can damage the coil or valve cover. Clean mounting surfaces.

Starting System

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Proper torque is essential for starter alignment and good grounding. Ensure the mating surfaces are clean.

Charging System

1

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Proper torque ensures secure mounting, prevents vibrations, and maintains a reliable ground connection. Clean contact surfaces.

Battery System

1

Battery Terminal Nut

M8 x 1.25
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Proper torque ensures good electrical contact and prevents terminal damage. Under-tightening causes resistance; over-tightening can break the terminal.

Control Modules

1

Engine Control Unit (ECU) Mounting Bolt

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Estimated value. These bolts secure the ECU to the chassis or firewall. Improper torque can cause vibrations or damage the ECU housing. Do not over-tighten. Ensure secure grounding.
2

Body Control Module (BCM) Mounting Bolt

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Estimated value. These bolts secure the BCM within the vehicle's interior structure. Proper torque prevents damage and maintains a good ground connection. Do not over-tighten.

Grounding System

1

Ground Strap Bolt (Body/Engine)

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque is crucial for reliable electrical connections and safety. Ensure that mating surfaces are clean and free of corrosion.

Sensor Mounting

1

Sensor Mounting Bolt (Various)

M5 x 0.8
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Estimated value, unless otherwise specified by the sensor manufacturer. Proper torque is important to ensure accurate sensor readings and prevent damage. Be cautious of plastic components and do not over-tighten.

Emissions Sensors

Torque specifications for Emissions_sensors

Egr System

1

EGR Valve Mounting Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure mating surfaces are clean and free of debris. Use new gaskets if required.

Exhaust System

1

Exhaust Manifold/Header to Cylinder Head Bolts

M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Always use new gaskets. Tighten bolts in a criss-cross pattern.
2

Exhaust Pipe to Exhaust Manifold/Header Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Use new gaskets or fasteners where required. Ensure mating surfaces are clean.
3

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure the mating surfaces are clean and use new gaskets if necessary.
4

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure proper alignment of the muffler and use new fasteners or gaskets as needed.

Sensor System

1

Oxygen (O2) Sensor

M18 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure threads are clean. Do not overtighten as this could damage the sensor. Apply anti-seize if recommended by the manufacturer. This is an estimated value.
2

Nitrogen Oxide (NOx) Sensor Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure mating surfaces are clean and free of debris. Do not over-tighten. This is an estimated value.
3

Mass Airflow (MAF) Sensor Mounting Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure the MAF sensor is correctly positioned in the intake tube. Do not over-tighten. This is an estimated value.
4

Intake Air Temperature (IAT) Sensor Mounting Bolt(s)

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure mating surfaces are clean and free of debris. Do not over-tighten. This is an estimated value.
5

Differential Pressure Sensor Mounting Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure the differential pressure sensor is properly aligned to its mounting points. Do not over-tighten. This is an estimated value.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Header to Cylinder Head Bolts

M8 x 1.25
Torque Specification
1. 15 ft-lbs (20 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even pressure on the gasket. Use new gaskets for optimal sealing. This may be a bracket connecting the manifold to the head.
2

Exhaust Manifold/Header Flange Bolts

M10 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even pressure on the flange. These bolts connect the manifold/header to the downpipe or other exhaust component.

Exhaust Piping

1

Exhaust Pipe Flange Bolts

M10 x 1.5
Torque Specification
1. 25 ft-lbs (34 N·m)
Important Notes
Tighten flange bolts evenly in a crisscross pattern to ensure a proper seal and prevent leaks. Use new gaskets for optimal sealing.
2

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
1. 20 ft-lbs (27 N·m)
Important Notes
Ensure proper alignment and use a new gasket. Tighten in a crisscross pattern.

Muffler

1

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
1. 30 ft-lbs (41 N·m)
Important Notes
Tighten evenly to avoid stressing the muffler and pipe connection. Use new gaskets to ensure proper sealing.

Support Components

1

Exhaust Hanger/Bracket Bolts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper alignment before tightening. Do not over tighten, as this may cause damage or over-stress the mounting hardware.
2

Exhaust Clamp Bolt Torque

Varies, typically M8 x 1.25
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Clamp bolt torque should be set to prevent pipe slipping, but not so tight as to damage pipes. Estimated Value.

Sensor Components

1

O2 Sensor Bolt

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
This is for a bolt-on O2 sensor, not a thread-in sensor. Ensure the sensor is correctly positioned to avoid inaccurate readings. Estimated value.

Fuel

Torque specifications for Fuel

Fuel Rail

1

Fuel Rail Mounting Bolts

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Tighten fuel rail bolts evenly to ensure a proper seal. Ensure the rail is correctly aligned before final tightening.
2

Fuel Injector Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the injectors are properly seated before tightening. Do not over-tighten.
3

Fuel Injector Rail Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
These bolts secure the injector rail specifically, and are not the main rail mounting bolts. Check for proper alignment before final tightening. Do not over-tighten.
4

Fuel Pressure Regulator Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Tighten the fuel pressure regulator bolts carefully to ensure a proper seal without damaging the regulator. Do not over-tighten.

Fuel Delivery

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the fuel pump is properly seated in its bracket or tank. Do not over-tighten.
2

Fuel Filter Bolt/Nut

M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the filter is correctly positioned before tightening. Some vehicles may use a retaining clip, if so verify torque with service manual. Do not over-tighten.
3

Fuel Line Banjo Bolts (or Fittings)

Varies (M10 x 1.0 estimated)
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque specification may vary. Use new crush washers and ensure fittings are correctly aligned. This is an estimated value, verify against service manual for exact bolt/fitting size.
4

Fuel Line Clip Retaining Bolt

M6 x 1.0
Torque Specification
5 ft-lbs (7 N·m)
Important Notes
Ensure fuel line clip is correctly positioned. Do not over-tighten.

Fuel Tank

1

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Ensure the filler neck is properly seated against the vehicle body and tank. Do not over-tighten.
2

Fuel Tank Sending Unit Retaining Ring

N/A
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
This may require a special tool, refer to the service manual. Ensure the seal is properly seated before tightening. This is an estimated value, torque may vary by model and tank size.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Ensure bolts are clean and lubricated. Torque evenly.

Ac Lines

1

A/C Line Fittings

Varies (typically M10-M14 x 1.25)
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Do not over-tighten. Use new O-rings for sealing. Estimated Value.

Condenser

1

Condenser Mounting Bolts

M8 x 1.25
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure the condenser is properly aligned before tightening. Estimated Value.

Evaporator

1

Evaporator Housing Bolts/Screws

M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Tighten evenly to avoid cracking the plastic housing. Estimated Value.

Blower Motor

1

HVAC Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Ensure the motor is seated correctly before tightening. Estimated Value.

Control Panel

1

HVAC Control Panel Mounting Screws

M4 x 0.7
Torque Specification
4 ft-lbs (5.5 N·m)
Important Notes
Do not over-tighten to avoid damaging plastic. Estimated Value.

Expansion Valve

1

Expansion Valve Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
Ensure a proper seal using new O-rings. Estimated Value.

Receiver Drier

1

Receiver Drier Mounting Bolts

M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Make sure the drier is properly positioned before tightening. Estimated Value.

Suspension

Torque specifications for Suspension

Front Suspension

1

Strut to Body Mounting Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
These bolts secure the top of the strut assembly to the vehicle's body. Tighten evenly to avoid binding.
2

Strut to Knuckle Mounting Bolts

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

Lower Control Arm to Subframe Bolts

M14 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the control arm to the subframe, proper torque ensures proper suspension geometry and function.
4

Lower Control Arm to Knuckle Bolt

M14 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
These bolts attach the control arm to the wheel knuckle, and should be torqued with the suspension loaded at ride height.
5

Ball Joint Nut

M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
This nut secures the ball joint to the knuckle or control arm. Ensure the joint is properly seated.
6

Upper Control Arm to Frame Bolts

M12 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
These bolts secure the upper control arm to the frame, proper torque ensures proper suspension geometry and function.
7

Upper Control Arm to Knuckle Bolts

M12 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
These bolts secure the upper control arm to the wheel bearing housing or knuckle, proper torque ensures proper suspension geometry and function.
8

Sway Bar Link Nut

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
These nuts attach the sway bar link to the strut or control arm and sway bar. Ensure proper seating of all components.

Rear Suspension

1

Rear Trailing Arm to Chassis Bolts

M14 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
These bolts secure the trailing arm to the chassis, use proper torque for safe operation.
2

Rear Trailing Arm to Wheel Carrier Bolts

M14 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
These bolts secure the trailing arm to the wheel carrier, use proper torque for safe operation.

Steering Components

1

Tie Rod End Nut

M12 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle and the tie rod. Ensure proper alignment of steering components before final tightening.

Sway Bar Components

1

Sway Bar Mounting Bracket Bolts

M8 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
These bolts secure the sway bar bushings and brackets to the vehicle's frame or chassis. Do not over tighten.

Subframe

1

Subframe Mounting Bolts

M16 x 2.0
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
These bolts attach the subframe to the chassis of the car. Torque to specification to ensure safety and structural rigidity.

Sensor Components

1

Wheel Speed Sensor Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (9.5 N·m)
Important Notes
These bolts mount the wheel speed sensors to the wheel bearing housing. Do not over tighten.
2

Ride Height Sensor Link Bolts

M6 x 1.0
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
These bolts secure the ride height sensor links. 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 correct torque specification for the front brake caliper bolts on a 2018-present BMW 850i?

According to BMW specifications, the torque for the front brake caliper bolts IS 118 ft-lbs (160 Nm).

Q2

What type of torque wrench should be used for tightening engine head bolts?

A calibrated digital or click-type torque wrench IS recommended for achieving accurate and consistent torque.

Q3

Can I use a regular wrench to tighten suspension bolts?

It IS not advisable to use a regular wrench for tightening suspension bolts. Using a torque wrench ensures proper tension and prevents overtightening or undertightening.

Q4

What IS the recommended torque sequence for tightening wheel bolts?

BMW recommends using a star pattern sequence for tightening lug nuts. Start with the nut directly opposite the valve stem and tighten in a criss-cross pattern, working your way outward.

Q5

Can I reuse torque-to-yield bolts?

Torque-to-yield bolts are designed for one-time use and should not be reused. Using them again can compromise their structural integrity and lead to failure.

Q6

What are the consequences of overtightening a bolt?

Overtightening can damage the threads, strip the bolt, or cause it to snap. It can also lead to warping or cracking of the surrounding components.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Digital Torque Wrench (10-100 Nm)

Essential for tightening fasteners to precise torque specifications, preventing damage and ensuring proper assembly. This range IS suitable for many applications on the 850I.

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

Engine Cylinder Head Bolt Tightening Sequence

Outlines the proper sequence and torque specifications for tightening cylinder head bolts on the 850I.

  • Refer to the BMW repair manual for specific torque values.
  • Clean all bolt threads and mating surfaces.
  • Apply engine oil to bolt threads.
  • Tighten bolts in the specified sequence, using a digital torque wrench.
View full procedure

Brake Caliper Bolt Tightening Specifications

Provides torque specifications for brake caliper bolts on the 850I, ensuring proper brake system functionality and safety.

  • Locate the appropriate torque specifications in the BMW repair manual.
  • Clean all bolt threads and mating surfaces.
  • Apply a suitable threadlocker to bolt threads.
  • Tighten bolts to the specified torque using a digital torque wrench.
View full procedure
Technical Service Bulletins

Service Bulletin: Incorrect Engine Cylinder Head Bolt Tightening Procedure

2020-03-15

Addresses an issue where incorrect tightening procedures for engine cylinder head bolts may have been provided in earlier documentation. This bulletin provides updated and corrected torque specifications.

2018-2019 850I

Resolution: Follow the updated torque specifications provided in this bulletin. Refer to the revised service procedure for the correct tightening sequence.

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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
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About the Author

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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