Mercedes-Benz Vehicle Models Mercedes B-Class 2018-present Torque Specifications
Mercedes-Benz Vehicle Models Mercedes B-Class 2018-present

Mercedes-Benz Vehicle Models Mercedes B-Class 2018-present Torque Specifications

Complete Mercedes-Benz Vehicle Models Mercedes B-Class 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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

1.3l I4 Engine

Torque specifications for 1.3L-I4 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.25
Torque Specification
1. 18 ft-lbs (25 N·m) 2. 90°
Important Notes
Follow the manufacturer's specified torque sequence for proper sealing and alignment.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment of the crankshaft before tightening.
2

Connecting Rod Nuts

M8 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of the connecting rods before tightening.

Flywheel And Clutch

1

Flywheel Bolts

M12 x 1.5
Torque Specification
41 ft-lbs (55 N·m)
Important Notes
Ensure the flywheel is properly aligned with the crankshaft before tightening.

Oil System

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the oil pan gasket is properly seated before tightening.
2

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Replace the crush washer to ensure proper sealing.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tension of the timing belt/chain before tightening.
2

Camshaft Sprocket Bolt

M10 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the camshaft sprocket is properly aligned with the timing marks.

2.0l I4 Engine

Torque specifications for 2.0L-I4 Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.25
Torque Specification
1. 18 ft-lbs (25 N·m) 2. 90°
Important Notes
Follow the manufacturer's specified torque sequence. Final tightening is angle-based.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the valve cover gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M10 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Follow the manufacturer's specified torque sequence.
2

Connecting Rod Nuts

M8 x 1.0
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Ensure proper alignment of connecting rods before tightening.

Timing System

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the tensioner is properly aligned before tightening.
2

Camshaft Sprocket Bolt

M10 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the camshaft sprocket.

Intake And Exhaust

1

Intake Manifold Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Follow the manufacturer's specified torque sequence.
2

Exhaust Manifold Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the exhaust manifold gasket is properly seated.

Lubrication System

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the oil pan gasket is properly seated.
2

Oil Drain Plug

M14 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Replace the crush washer during installation.

7g Dct Transmission

Torque specifications for 7g Dct Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Secure the transmission to the engine block or transmission tunnel.

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Secure the oil pan to the transmission.

Transmission Fluid Drain and Fill

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure a leak-free seal when draining or filling the transmission fluid.

Transmission Case

1

7G-DCT Transmission Case Bolts

M10 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on industry standards for similar transmission designs. Secure the transmission case together.

Transmission Valve Body

1

7G-DCT Transmission Valve Body Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on industry standards for similar transmission designs. Secure the valve body to the transmission case.

Transmission Solenoid Pack

1

7G-DCT Transmission Solenoid Pack Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards for similar transmission designs. Secure the solenoid pack to the transmission case.

Transmission Filter

1

7G-DCT Transmission Filter Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on industry standards for similar transmission designs. Secure the transmission filter to the transmission case.

8g Dct Transmission

Torque specifications for 8g Dct Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)

Transmission Oil System

1

Transmission Oil Pan Bolts

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

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
3

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Specification
18 ft-lbs (25 N·m)

Transmission Case and Bellhousing

1

8G-DCT Transmission Case Bolts

M14 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on industry standards.
2

8G-DCT Transmission Bellhousing Bolts

M12 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value based on industry standards.

Transmission Clutch and Gearbox

1

8G-DCT Transmission Clutch Pack Bolts

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on industry standards.
2

8G-DCT Transmission Gearbox Bolts

M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on industry standards.

Body

Torque specifications for Body

Suspension and Steering

1

Strut/Shock Absorber Mounting Bolts

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

Control Arm Bolts

M16 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
3

Ball Joint Nut

M12 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
4

Tie Rod End Nut

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
5

Sway Bar Link Nut

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
6

Steering Gear/Rack Bolts

M14 x 1.5
Torque Specification
74 ft-lbs (100 N·m)

Body and Bumpers

1

Front Bumper Mounting Bolts

M12 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on general industry standards.
2

Rear Bumper Mounting Bolts

M12 x 1.25
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on general industry standards.
3

Hood Hinge Bolts

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on general industry standards.
4

Trunk Lid Hinge Bolts

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on general industry standards.
5

Door Hinge Bolts

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on general industry standards.
6

Body Mounting Bolts

M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on general industry standards.

Brakes

Torque specifications for Brakes

Brake Caliper

1

Brake Caliper Bolts

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure the caliper is properly aligned before tightening. Torque in a crisscross pattern.
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Specification
130 ft-lbs (176 N·m)
Important Notes
Ensure the bracket is securely attached to the steering knuckle or axle.

Brake Rotor Drum

1

Brake Disc/Drum Retaining Bolts

M10 x 1.25
Torque Specification
65 ft-lbs (88 N·m)
Important Notes
Ensure the rotor or drum is properly seated on the hub before tightening.

Brake Hydraulics

1

Brake Hose Banjo Bolt

M10 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the banjo bolt is properly aligned with the brake hose and caliper. Use new sealing washers.
2

Brake Bleeder Screw

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Do not overtighten the bleeder screw to avoid damage. Use a flare nut wrench if necessary.
3

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the master cylinder is properly aligned with the brake booster or firewall.

Parking Brake

1

Parking Brake Cable Bracket Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the parking brake cable is properly routed and aligned before tightening.

Wheel Assembly

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
96 ft-lbs (130 N·m)
Important Notes
Torque the lug nuts in a star pattern to ensure even clamping force. Recheck torque after 50 miles of driving.

Drivetrain

Torque specifications for Drivetrain

Engine Drivetrain Connectors

1

Flywheel Bolts

M12 x 1.5
Torque Specification
41 ft-lbs (55 N·m)
Important Notes
Flywheel bolts secure the flywheel to the crankshaft.
2

Propeller/Drive Shaft Bolts

M14 x 1.5
Torque Specification
41 ft-lbs (55 N·m)
Important Notes
Propeller shaft bolts secure the propeller shaft to the transmission.

Transmission Components

1

Transmission Mounting Bolts

M16 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Transmission mounting bolts secure the transmission to the engine and chassis.
2

Transmission Oil Pan Bolts

M10 x 1.5
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Transmission oil pan bolts secure the oil pan to the transmission.
3

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Transmission drain and fill plugs allow for the transmission fluid to be drained and filled.

Driveshaft Components

1

Driveshaft Center Bearing Bolts

M14 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Driveshaft center bearing bolts secure the center bearing to the driveshaft.
2

Axle Shaft Bolts

M16 x 1.5
Torque Specification
60 ft-lbs (80 N·m)
Important Notes
Axle shaft bolts secure the axle shafts to the differential and wheels.

Differential Components

1

Differential Cover Bolts

M12 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Differential cover bolts secure the differential cover to the differential.
2

Differential Drain/Fill Plug

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Differential drain and fill plug allows for the differential fluid to be drained and filled.

Transfer Case Components

1

Transfer Case Mounting Bolts

M16 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Transfer case mounting bolts secure the transfer case to the transmission and chassis.
2

Transfer Case Drain/Fill Plug

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Transfer case drain and fill plug allows for the transfer case fluid to be drained and filled.

Axle Components

1

CV Joint/Axle Nut

M18 x 1.5
Torque Specification
170 ft-lbs (230 N·m)
Important Notes
CV joint/axle nut secures the CV joint to the drive axle.

Electrical

Torque specifications for Electrical

Alternator And Starter Motor

1

Alternator Mounting Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
2

Starter Motor Mounting Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)

Battery And Grounding

1

Battery Terminal Nuts

M10 x 1.5
Torque Specification
N/A
Important Notes
Hand-tight only. Do not overtighten.
2

Ground Strap Bolts (Engine to Chassis)

M8 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Consult manufacturer's recommendations for specific torque values.

Electrical Connectors And Fuses

1

Electrical Connector Bolts (e.g., ignition coil, fuel injector)

M6 x 1.0
Torque Specification
7.5 ft-lbs (10.5 N·m)
Important Notes
Estimated value. Consult manufacturer's recommendations for specific torque values.
2

Fuses and Relay Box Mounting Bolts

M10 x 1.5
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value. Consult manufacturer's recommendations for specific torque values.

Emissions Sensors

Torque specifications for Emissions_sensors

Exhaust System

1

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper torque to prevent leaks and ensure a secure connection to the cylinder head.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper torque to prevent leaks and ensure a secure connection to the cylinder head.
3

Catalytic Converter to Exhaust Pipe Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper torque to prevent leaks and ensure a secure connection to the exhaust pipe.

Emissions Sensors

1

Oxygen Sensor Bolts

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.75 N·m)
Important Notes
Estimated value. Ensure proper torque to prevent damage to the sensor or exhaust system.
2

NOx Sensor Bolts

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.75 N·m)
Important Notes
Estimated value. Ensure proper torque to prevent damage to the sensor or exhaust system.
3

Exhaust Gas Temperature Sensor Bolts

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.75 N·m)
Important Notes
Estimated value. Ensure proper torque to prevent damage to the sensor or exhaust system.

EGR System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure proper torque to prevent leaks and ensure a secure connection to the intake manifold.

Diesel Particulate Filter (DPF)

1

DPF Bolts

M14 x 1.5
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Estimated value. Ensure proper torque to prevent damage to the DPF or exhaust system.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold and Headers

1

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)

Exhaust Pipe and Muffler

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
2

Catalytic Converter to Exhaust Pipe Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
3

Muffler to Exhaust Pipe Bolts

M12 x 1.5
Torque Specification
18 ft-lbs (25 N·m)

Oxygen Sensor and Heat Shield

1

Oxygen Sensor Bolts

M10 x 1.25
Torque Specification
17.5 ft-lbs (23.75 N·m)
Important Notes
Estimated value, consult vehicle's repair manual or manufacturer's instructions for accurate torque specifications.
2

Exhaust System Heat Shield Bolts

M8 x 1.25
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value, consult vehicle's repair manual or manufacturer's instructions for accurate torque specifications.

Exhaust System Mounting and Turbocharger

1

Exhaust System Mounting Bolts

M14 x 1.5
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value, consult vehicle's repair manual or manufacturer's instructions for accurate torque specifications.
2

Turbocharger Bolts

M16 x 1.5
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Estimated value, consult vehicle's repair manual or manufacturer's instructions for accurate torque specifications.

Fuel

Torque specifications for Fuel

Fuel Rail System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure injectors are properly seated before tightening.

Fuel Pump System

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure the pump is properly aligned before tightening.
2

High-Pressure Fuel Pump Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar high-pressure pump applications.

Fuel Tank System

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure straps are evenly tightened to avoid tank distortion.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure a tight seal to prevent fuel vapor leaks.
3

Fuel Tank Sender Unit Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure a tight seal to prevent fuel leaks and sensor malfunction.

Fuel Filter And Lines

1

Fuel Filter Bolt/Nut

M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the filter is properly aligned before tightening.
2

Fuel Line Flange Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar flange applications.

Fuel Pressure Regulation

1

Fuel Pressure Regulator Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure a tight seal to prevent fuel leaks or pressure irregularities.

Hvac

Torque specifications for Hvac

A/C Compressor and Condenser

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secure the compressor to the engine block, ensuring proper alignment and preventing vibration.
2

A/C Condenser Mounting Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on industry standards. Secure the condenser to the radiator support, ensuring proper airflow and heat transfer.

A/C Lines and Fittings

1

A/C Line Fittings

N/A
Torque Specification
N/A
Important Notes
Hand-tight only. Connect the refrigerant lines to the compressor, condenser, and evaporator, ensuring a leak-free seal.
2

A/C Refrigerant Line Bracket Bolts

M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value based on industry standards. Secure the refrigerant lines to the engine compartment or chassis, preventing damage and ensuring proper routing.

Heater Core and Evaporator

1

Heater Core Mounting Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards. Secure the heater core to the dashboard or HVAC module, ensuring proper airflow and heat transfer.
2

A/C Evaporator Mounting Bolts

M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards. Secure the evaporator to the dashboard or HVAC module, ensuring proper airflow and refrigerant flow.

Suspension

Torque specifications for Suspension

Front Suspension

1

Strut/Shock Absorber Mounting Bolts

M14 x 2.0
Torque Specification
80 ft-lbs (108 N·m)
2

Control Arm Bolts

M16 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
3

Upper Control Arm Bushing Bolts

M12 x 1.25 (estimated)
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated torque value based on industry standards for similar applications.

Lower Suspension

1

Lower Control Arm Bolts

M14 x 2.0 (estimated)
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Estimated torque value based on industry standards for similar applications.
2

Coil Spring Mounting Bolts

M10 x 1.5 (estimated)
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated torque value based on industry standards for similar applications.

Steering System

1

Tie Rod End Nut

M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
2

Steering Gear/Rack Mounting Bolts

M14 x 2.0
Torque Specification
90 ft-lbs (122 N·m)
Important Notes
Additional specification for steering gear/rack mounting bolts to the subframe.

Sway Bar System

1

Sway Bar Link Nut

M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

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

Stripped Fasteners

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

Overtightened Components

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

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

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

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

Torque Verification

Verify the torque applied to the fasteners

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

Thread Assessment

Assess the condition of the threads

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

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

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

Maintenance Tips

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

Tool Care

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

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

What IS the recommended torque for the lug nuts on a 2018-Present Mercedes b-class?

Tighten the lug nuts to 120 Nm (89 ft-lb).

Q2

What type of torque wrench IS required for tightening the bolts on a Mercedes b-class?

Use a calibrated torque wrench that meets Mercedes specifications and IS appropriate for the torque range required.

Q3

How often should torque specifications be checked?

Torque specifications should be checked and re-tightened if necessary according to the maintenance schedule or as recommended by a qualified mechanic.

Q4

What are the potential consequences of overtightening bolts?

Overtightening bolts can strip the threads, damage the bolt or component, or cause the component to fail.

Q5

What safety precautions should be taken when working with torque specifications?

Always wear appropriate safety gear, use the correct tools, and follow the specified torque values to avoid injury or damage to components.

Q6

Where can I find detailed torque specifications for my specific Mercedes b-class model?

Refer to the official Mercedes service manual for the exact torque specifications applicable to your particular b-class model and year.

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 readings
  • Audible alarm when target torque IS reached
  • Converts from Nm to ft-lb and in-lb for versatility
  • Reversible ratcheting mechanism for convenience
Learn more
Service Procedures

Wheel Bolt Torque Procedure

Step-by-step guide to properly torque wheel bolts on Mercedes b-class

  • Clean the wheel bolt threads and mating surfaces
  • Apply a small amount of anti-seize compound to the threads
  • Tighten the bolts in a star pattern to the specified torque
  • Double-check the torque of each bolt using a torque wrench
  • Install the wheel and tighten the lug nuts using a torque wrench
View full procedure
Technical Service Bulletins

Transmission Mount Bolt Torque Issue

2023-08-01

Some Mercedes b-class models have insufficient torque on the transmission mount bolts.

2018-2020 b-class

Resolution: Inspect and tighten the transmission mount bolts using the updated torque specifications: - M12 bolts: 80 Nm - M10 bolts: 50 Nm

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

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.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

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.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

© 2025 Mercedes-Benz Specs. All rights reserved.

Privacy Policy Terms of Service