Mercedes-Benz Vehicle Models Mercedes B-Class 2011-2018
Mercedes-Benz Vehicle Models Mercedes B-Class 2011-2018 Torque Specifications
Complete Mercedes-Benz Vehicle Models Mercedes B-Class 2011-2018 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
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
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
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
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
Recommended Tools
Torque Wrench (1/4" Drive)
Range: 2-25 ft-lbs
Small fasteners, delicate components
Torque Wrench (3/8" Drive)
Range: 10-100 ft-lbs
Most common automotive fasteners
Torque Wrench (1/2" Drive)
Range: 30-250 ft-lbs
Large fasteners, wheels
Angle Gauge
Torque-to-yield (TTY) bolts
Torque Wrench Care
- Calibrate annually or after 5,000 clicks
- Store at lowest setting
- Keep clean and lubricated
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Torque Calculator
Convert between different torque units
1.5l I4 Engine
Torque specifications for 1.5L-I4 Engine
1.5l I4 Engine
Torque specifications for 1.5L-I4 Engine
Cylinder Head
1 Cylinder Head Bolts
M10 x 1.5
1
Cylinder Head Bolts
M10 x 1.5
Torque Specification
1. 15 ft-lbs (20 N·m)
2. 22 ft-lbs (30 N·m)
Important Notes
Follow the manufacturer's torque sequence for cylinder head bolts to ensure even clamping force.
2 Valve Cover Bolts
M6 x 1.0
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
1
Main Bearing Bolts
M10 x 1.25
Torque Specification
40 ft-lbs (55 N·m)
Important Notes
Follow the manufacturer's torque sequence for main bearing caps.
2 Connecting Rod Nuts
M8 x 1.25
2
Connecting Rod Nuts
M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure connecting rod bearings are properly installed before tightening.
Timing System
1 Timing Belt/Chain Tensioner Bolt
M8 x 1.25
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
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.
Oil System
1 Oil Pan Bolts
M6 x 1.0
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
M12 x 1.5
2
Oil Drain Plug Bolt
M12 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Replace the crush washer to prevent leaks.
1.8l I4 Engine
Torque specifications for 1.8L-I4 Engine
1.8l I4 Engine
Torque specifications for 1.8L-I4 Engine
Cylinder Head
1 Cylinder Head Bolts
M10 x 1.5
1
Cylinder Head Bolts
M10 x 1.5
Torque Specification
1. 15 ft-lbs (20 N·m)
2. 22 ft-lbs (30 N·m)
Important Notes
Torque sequence must be followed as per manufacturer guidelines. Estimated bolt size based on typical M10 bolts for cylinder heads.
2 Valve Cover Bolts
M6 x 1.0
2
Valve Cover Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure even tightening to prevent warping of the valve cover.
Crankshaft And Bearings
1 Main Bearing Bolts
M12 x 1.5
1
Main Bearing Bolts
M12 x 1.5
Torque Specification
40 ft-lbs (55 N·m)
Important Notes
Torque sequence must be followed as per manufacturer guidelines. Estimated bolt size based on typical M12 bolts for main bearings.
2 Flywheel Bolts
M10 x 1.25
2
Flywheel Bolts
M10 x 1.25
Torque Specification
48 ft-lbs (65 N·m)
Important Notes
Ensure flywheel is properly aligned before tightening.
Timing System
1 Timing Belt/Chain Tensioner Bolt
M8 x 1.25
1
Timing Belt/Chain Tensioner Bolt
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure tensioner is properly aligned before tightening.
2 Camshaft Sprocket Bolt
M10 x 1.25
2
Camshaft Sprocket Bolt
M10 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure camshaft is properly aligned before tightening.
Intake And Exhaust
1 Intake Manifold Bolts
M8 x 1.25
1
Intake Manifold Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Torque sequence must be followed to prevent warping of the manifold.
2 Exhaust Manifold Bolts
M8 x 1.25
2
Exhaust Manifold Bolts
M8 x 1.25
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Torque sequence must be followed to prevent warping of the manifold.
Oil System
1 Oil Pan Bolts
M6 x 1.0
1
Oil Pan Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure even tightening to prevent oil leaks.
2 Oil Drain Plug Bolt
M14 x 1.5
2
Oil Drain Plug Bolt
M14 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Replace crush washer if applicable.
2.0l I4 Engine
Torque specifications for 2.0L-I4 Engine
2.0l I4 Engine
Torque specifications for 2.0L-I4 Engine
Cylinder Head
1 Cylinder Head Bolts
M14 x 1.5
1
Cylinder Head Bolts
M14 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Main Bearings
1 Main Bearing Bolts
M18 x 1.5
1
Main Bearing Bolts
M18 x 1.5
Torque Specification
40 ft-lbs (55 N·m)
Rod and Piston
1 Connecting Rod Nuts
M16 x 1.5
1
Connecting Rod Nuts
M16 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Flywheel and Crankshaft
1 Flywheel Bolts
M20 x 1.5
1
Flywheel Bolts
M20 x 1.5
Torque Specification
48 ft-lbs (65 N·m)
2 Crankshaft Pulley/Harmonic Balancer Bolt
M22 x 1.5
2
Crankshaft Pulley/Harmonic Balancer Bolt
M22 x 1.5
Torque Specification
81 ft-lbs (110 N·m)
Engine Block and Oil Pan
1 Oil Pan Bolts
M10 x 1.5
1
Oil Pan Bolts
M10 x 1.5
Torque Specification
7 ft-lbs (10 N·m)
2 Cylinder Block Drain Plug Bolt
M12 x 1.5
2
Cylinder Block Drain Plug Bolt
M12 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
Valve Train
1 Valve Cover Bolts
M8 x 1.25
1
Valve Cover Bolts
M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
2 Rocker Arms/Shafts Bolts
M12 x 1.5
2
Rocker Arms/Shafts Bolts
M12 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Intake and Exhaust
1 Intake Manifold Bolts
M14 x 1.5
1
Intake Manifold Bolts
M14 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
2 Exhaust Manifold/Headers Bolts
M14 x 1.5
2
Exhaust Manifold/Headers Bolts
M14 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Timing and Fuel Systems
1 Timing Belt/Chain Tensioner Bolt
M16 x 1.5
1
Timing Belt/Chain Tensioner Bolt
M16 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
2 Camshaft Sprocket Bolt
M18 x 1.5
2
Camshaft Sprocket Bolt
M18 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
3 Fuel Injector Bolts
M10 x 1.25
3
Fuel Injector Bolts
M10 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Spark and Engine Mounts
1 Spark Plugs
14mm x 1.25
1
Spark Plugs
14mm x 1.25
Torque Specification
15 ft-lbs (20 N·m)
2 Engine Mounting Bolts
M16 x 1.5
2
Engine Mounting Bolts
M16 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
7g Dct Transmission
Torque specifications for 7g Dct Transmission
7g Dct Transmission
Torque specifications for 7g Dct Transmission
Transmission Mounting
1 Transmission Mounting Bolts
M12 x 1.5
1
Transmission Mounting Bolts
M12 x 1.5
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Estimated value based on similar components.
2 7G-DCT Transmission Gearbox Mounting Bolts
M14 x 1.5
2
7G-DCT Transmission Gearbox Mounting Bolts
M14 x 1.5
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Estimated value based on similar components.
Transmission Case and Gearbox
1 7G-DCT Transmission Case Bolts
M12 x 1.5
1
7G-DCT Transmission Case Bolts
M12 x 1.5
Torque Specification
42.5 ft-lbs (57.5 N·m)
Important Notes
Estimated value based on similar components.
2 7G-DCT Transmission Gearbox Cover Bolts
M10 x 1.5
2
7G-DCT Transmission Gearbox Cover Bolts
M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on similar components.
Transmission Clutch and Solenoid
1 7G-DCT Transmission Clutch Pack Bolts
M12 x 1.5
1
7G-DCT Transmission Clutch Pack Bolts
M12 x 1.5
Torque Specification
23.5 ft-lbs (31.5 N·m)
Important Notes
Estimated value based on similar components.
2 7G-DCT Transmission Solenoid Pack Bolts
M8 x 1.25
2
7G-DCT Transmission Solenoid Pack Bolts
M8 x 1.25
Torque Specification
8 ft-lbs (10.5 N·m)
Important Notes
Estimated value based on similar components.
Transmission Oil Pan and Drain
1 Transmission Oil Pan Bolts
M10 x 1.5
1
Transmission Oil Pan Bolts
M10 x 1.5
Torque Specification
8 ft-lbs (10.5 N·m)
2 Transmission Drain and Fill Plugs
M14 x 1.5
2
Transmission Drain and Fill Plugs
M14 x 1.5
Torque Specification
23.5 ft-lbs (31.5 N·m)
3 Transmission Fluid Drain/Fill Plug
M14 x 1.5
3
Transmission Fluid Drain/Fill Plug
M14 x 1.5
Torque Specification
25.5 ft-lbs (34.5 N·m)
Body
Torque specifications for Body
Body
Torque specifications for Body
Fuel System
1 Fuel Tank Strap Bolts
M8 x 1.25
1
Fuel Tank Strap Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure even tightening to prevent fuel tank misalignment or leaks.
2 Fuel Filler Neck Bolts
M6 x 1.0
2
Fuel Filler Neck Bolts
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure proper alignment of the filler neck to prevent fuel leaks.
Electrical System
1 Battery Terminal Nuts
M6 x 1.0
1
Battery Terminal Nuts
M6 x 1.0
Torque Specification
6 ft-lbs (8 N·m)
Important Notes
Ensure clean and corrosion-free terminals before tightening.
Body Structure
1 Door Hinge Bolts
M8 x 1.25
1
Door Hinge Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Follow a crisscross pattern to ensure proper door alignment.
2 Seat Mounting Bolts
M10 x 1.5
2
Seat Mounting Bolts
M10 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Ensure seats are securely mounted for passenger safety.
3 Bumper Mounting Bolts
M8 x 1.25
3
Bumper Mounting Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure even tightening to prevent bumper misalignment.
4 Hood Hinge Bolts
M8 x 1.25
4
Hood Hinge Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper alignment of the hood to prevent rattling.
5 Trunk Lid/Hatch Hinge Bolts
M8 x 1.25
5
Trunk Lid/Hatch Hinge Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper alignment of the trunk lid or hatch.
Exterior Accessories
1 Roof Rack Mounting Bolts
M8 x 1.25
1
Roof Rack Mounting Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure even tightening to prevent leaks or damage to the roof.
Interior Components
1 Interior Trim Panel Screws
M5 x 0.8
1
Interior Trim Panel Screws
M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure panels are securely attached to prevent rattling.
Brakes
Torque specifications for Brakes
Brakes
Torque specifications for Brakes
Brake Caliper
1 Brake Caliper Bolts
M12 x 1.5
1
Brake Caliper Bolts
M12 x 1.5
Torque Specification
77.5 ft-lbs (105 N·m)
Important Notes
Torque value is the midpoint of the specified range (74-81 ft-lbs / 100-110 Nm).
2 Brake Caliper Mounting Bracket Bolts
M12 x 1.5
2
Brake Caliper Mounting Bracket Bolts
M12 x 1.5
Torque Specification
84 ft-lbs (115 N·m)
Important Notes
Torque value is the midpoint of the specified range (81-87 ft-lbs / 110-120 Nm).
Brake Disc Drum
1 Brake Disc/Drum Retaining Bolts
M12 x 1.5
1
Brake Disc/Drum Retaining Bolts
M12 x 1.5
Torque Specification
84 ft-lbs (115 N·m)
Important Notes
Torque value is the midpoint of the specified range (81-87 ft-lbs / 110-120 Nm).
Brake Hydraulics
1 Brake Hose Banjo Bolt
M10 x 1.0
1
Brake Hose Banjo Bolt
M10 x 1.0
Torque Specification
20 ft-lbs (27.5 N·m)
Important Notes
Torque value is the midpoint of the specified range (18-22 ft-lbs / 25-30 Nm).
2 Brake Master Cylinder Mounting Bolts
M8 x 1.25
2
Brake Master Cylinder Mounting Bolts
M8 x 1.25
Torque Specification
18.5 ft-lbs (25 N·m)
Important Notes
Torque value is the midpoint of the specified range (15-22 ft-lbs / 20-30 Nm).
Brake Booster
1 Brake Booster Mounting Bolts
M8 x 1.25
1
Brake Booster Mounting Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27.5 N·m)
Important Notes
Torque value is the midpoint of the specified range (18-22 ft-lbs / 25-30 Nm).
Brake Pedal
1 Brake Pedal Assembly Bolts
M8 x 1.25
1
Brake Pedal Assembly Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27.5 N·m)
Important Notes
Torque value is the midpoint of the specified range (18-22 ft-lbs / 25-30 Nm).
Abs System
1 ABS Sensor Mounting Bolts
M6 x 1.0
1
ABS Sensor Mounting Bolts
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Torque value is the midpoint of the specified range (7-9 ft-lbs / 10-12 Nm).
Drivetrain
Torque specifications for Drivetrain
Drivetrain
Torque specifications for Drivetrain
Engine
1 Flywheel Bolts
M12 x 1.5
1
Flywheel Bolts
M12 x 1.5
Torque Specification
48 ft-lbs (65 N·m)
2 Main Bearing Bolts
M14 x 1.5
2
Main Bearing Bolts
M14 x 1.5
Torque Specification
40 ft-lbs (55 N·m)
3 Connecting Rod Nuts
M10 x 1.5
3
Connecting Rod Nuts
M10 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
4 Crankshaft Pulley/Harmonic Balancer Bolt
M16 x 1.5
4
Crankshaft Pulley/Harmonic Balancer Bolt
M16 x 1.5
Torque Specification
81 ft-lbs (110 N·m)
Transmission
1 Transmission Mounting Bolts
M14 x 1.5
1
Transmission Mounting Bolts
M14 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
2 Transmission Oil Pan Bolts
M8 x 1.25
2
Transmission Oil Pan Bolts
M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
3 Drive Axle/Half Shaft Bolts
M16 x 1.5
3
Drive Axle/Half Shaft Bolts
M16 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Drivetrain
1 CV Joint/Axle Nut
M20 x 1.5
1
CV Joint/Axle Nut
M20 x 1.5
Torque Specification
180 ft-lbs (245 N·m)
2 Propeller/Drive Shaft Bolts
M16 x 1.5
2
Propeller/Drive Shaft Bolts
M16 x 1.5
Torque Specification
81 ft-lbs (110 N·m)
3 Differential Cover Bolts
M12 x 1.5
3
Differential Cover Bolts
M12 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Estimated value. Consult manufacturer's documentation for specific torque value.
Transfer Case
1 Transfer Case Mounting Bolts
M14 x 1.5
1
Transfer Case Mounting Bolts
M14 x 1.5
Torque Specification
40 ft-lbs (55 N·m)
Important Notes
Estimated value. Consult manufacturer's documentation for specific torque value.
Driveshaft
1 Driveshaft Center Bearing Bolts
M10 x 1.5
1
Driveshaft Center Bearing Bolts
M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Consult manufacturer's documentation for specific torque value.
Electrical
Torque specifications for Electrical
Electrical
Torque specifications for Electrical
Electrical System
1 Battery Terminal Nuts
M10 x 1.5
1
Battery Terminal Nuts
M10 x 1.5
Torque Specification
4.4 ft-lbs (6 N·m)
Important Notes
Secure the battery terminals to ensure proper connection and prevent damage to the battery or electrical system.
2 Alternator Mounting Bolts
M12 x 1.75
2
Alternator Mounting Bolts
M12 x 1.75
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Secure the alternator to the engine block to ensure proper charging of the battery and powering of the electrical system.
3 Starter Motor Mounting Bolts
M14 x 2.0
3
Starter Motor Mounting Bolts
M14 x 2.0
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Secure the starter motor to the engine block to ensure proper starting of the engine and connection to the electrical system.
4 Ignition Coil Mounting Bolts
M8 x 1.25
4
Ignition Coil Mounting Bolts
M8 x 1.25
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Estimated value. Secure the ignition coil to the engine block to ensure proper spark delivery and engine performance.
5 Fuel Pump Electrical Connector Bolts
M6 x 1.0
5
Fuel Pump Electrical Connector Bolts
M6 x 1.0
Torque Specification
4.4 ft-lbs (6 N·m)
Important Notes
Estimated value. Secure the electrical connector to the fuel pump to ensure proper connection and prevent damage to the fuel pump or electrical system.
6 A/C Compressor Electrical Connector Bolts
M6 x 1.0
6
A/C Compressor Electrical Connector Bolts
M6 x 1.0
Torque Specification
4.4 ft-lbs (6 N·m)
Important Notes
Estimated value. Secure the electrical connector to the A/C compressor to ensure proper connection and prevent damage to the A/C compressor or electrical system.
7 Power Steering Pump Electrical Connector Bolts
M6 x 1.0
7
Power Steering Pump Electrical Connector Bolts
M6 x 1.0
Torque Specification
4.4 ft-lbs (6 N·m)
Important Notes
Estimated value. Secure the electrical connector to the power steering pump to ensure proper connection and prevent damage to the power steering pump or electrical system.
Emissions Sensors
Torque specifications for Emissions_sensors
Emissions Sensors
Torque specifications for Emissions_sensors
Oxygen Sensors
1 Oxygen Sensor Bolts
M12 x 1.5
1
Oxygen Sensor Bolts
M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on industry standards. Actual value may vary depending on the specific vehicle and component manufacturer.
EGR Valve
1 EGR Valve Bolts
M10 x 1.25
1
EGR Valve Bolts
M10 x 1.25
Torque Specification
8 ft-lbs (11 N·m)
Catalytic Converter
1 Catalytic Converter to Exhaust Pipe Bolts
M14 x 1.5
1
Catalytic Converter to Exhaust Pipe Bolts
M14 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
NOx Sensor
1 NOx Sensor Bolts
M12 x 1.5
1
NOx Sensor Bolts
M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on industry standards. Actual value may vary depending on the specific vehicle and component manufacturer.
Diesel Particulate Filter (DPF)
1 DPF Bolts
M16 x 1.5
1
DPF Bolts
M16 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on industry standards. Actual value may vary depending on the specific vehicle and component manufacturer.
Exhaust Gas Temperature (EGT) Sensor
1 EGT Sensor Bolts
M12 x 1.5
1
EGT Sensor Bolts
M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value based on industry standards. Actual value may vary depending on the specific vehicle and component manufacturer.
Exhaust
Torque specifications for Exhaust
Exhaust
Torque specifications for Exhaust
Exhaust Manifold Headers
1 Exhaust Manifold/Headers Bolts
M12 x 1.5
1
Exhaust Manifold/Headers Bolts
M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated torque value based on similar components and bolt sizes.
2 Exhaust Manifold/Headers to Cylinder Head Bolts
M12 x 1.5
2
Exhaust Manifold/Headers to Cylinder Head Bolts
M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated torque value based on similar components and bolt sizes.
Exhaust Pipe
1 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M12 x 1.5
1
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated torque value based on similar components and bolt sizes.
2 Catalytic Converter to Exhaust Pipe Bolts
M12 x 1.5
2
Catalytic Converter to Exhaust Pipe Bolts
M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated torque value based on similar components and bolt sizes.
3 Muffler to Exhaust Pipe Bolts
M12 x 1.5
3
Muffler to Exhaust Pipe Bolts
M12 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated torque value based on similar components and bolt sizes.
Exhaust System Mounting
1 Exhaust System Mounting Bolts
M14 x 1.5
1
Exhaust System Mounting Bolts
M14 x 1.5
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Estimated torque value based on general industry standards.
Heat Shield
1 Heat Shield Bolts
M10 x 1.5
1
Heat Shield Bolts
M10 x 1.5
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated torque value based on general industry standards.
Exhaust System Clamp
1 Exhaust System Clamp Bolts
M10 x 1.5
1
Exhaust System Clamp Bolts
M10 x 1.5
Torque Specification
12 ft-lbs (16 N·m)
Important Notes
Estimated torque value based on general industry standards.
Oxygen Sensor
1 Oxygen Sensor Bolts
M8 x 1.25
1
Oxygen Sensor Bolts
M8 x 1.25
Torque Specification
17 ft-lbs (23 N·m)
Important Notes
Estimated torque value based on general industry standards.
Fuel
Torque specifications for Fuel
Fuel
Torque specifications for Fuel
Fuel Rail and Injectors
1 Fuel Rail Bolts
M10 x 1.5
1
Fuel Rail Bolts
M10 x 1.5
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Proper torque is essential to prevent fuel leaks and maintain engine performance.
2 Fuel Injector Bolts
M10 x 1.5
2
Fuel Injector Bolts
M10 x 1.5
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Proper torque is necessary to prevent fuel leaks and maintain engine performance.
Fuel Pump and Electrical Connectors
1 Fuel Pump Mounting Bolts
M12 x 1.75
1
Fuel Pump Mounting Bolts
M12 x 1.75
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Proper torque is essential to prevent fuel leaks and maintain engine performance.
2 Fuel Injector Electrical Connector Bolts
M6 x 1.0
2
Fuel Injector Electrical Connector Bolts
M6 x 1.0
Torque Specification
5.9 ft-lbs (8 N·m)
Important Notes
Proper torque is necessary to prevent electrical issues and maintain engine performance.
3 Fuel Pump Electrical Connector Bolts
M6 x 1.0
3
Fuel Pump Electrical Connector Bolts
M6 x 1.0
Torque Specification
5.9 ft-lbs (8 N·m)
Important Notes
Proper torque is necessary to prevent electrical issues and maintain engine performance.
Fuel Tank and Vent Valve
1 Fuel Tank Strap Bolts
M14 x 2.0
1
Fuel Tank Strap Bolts
M14 x 2.0
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Proper torque is necessary to prevent fuel tank damage and maintain safety.
2 Fuel Tank Vent Valve Bolts
M10 x 1.5
2
Fuel Tank Vent Valve Bolts
M10 x 1.5
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Proper torque is essential to prevent fuel system damage and maintain proper venting.
Fuel Filter and Filler Neck
1 Fuel Filter Bolt/Nut
M12 x 1.75
1
Fuel Filter Bolt/Nut
M12 x 1.75
Torque Specification
25.5 ft-lbs (35 N·m)
Important Notes
Proper torque is necessary to maintain fuel system performance and prevent damage.
2 Fuel Filler Neck Bolts
M10 x 1.5
2
Fuel Filler Neck Bolts
M10 x 1.5
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Proper torque is essential to maintain fuel system integrity and prevent fuel leaks.
Hvac
Torque specifications for Hvac
Hvac
Torque specifications for Hvac
Ac Compressor
1 A/C Compressor Mounting Bolts
M10 x 1.5
1
A/C Compressor Mounting Bolts
M10 x 1.5
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque values are based on industry standards. Ensure bolts are tightened in a crisscross pattern to avoid misalignment.
2 A/C Line Fittings
M8 x 1.25
2
A/C Line Fittings
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Torque values are based on industry standards. Ensure fittings are clean and free of debris before tightening.
Ac Condenser
1 A/C Condenser Mounting Bolts
M8 x 1.25
1
A/C Condenser Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Torque values are estimated based on industry standards. Tighten bolts in a crisscross pattern to avoid warping the condenser.
Ac Evaporator
1 A/C Evaporator Mounting Bolts
M6 x 1.0
1
A/C Evaporator Mounting Bolts
M6 x 1.0
Torque Specification
13 ft-lbs (18 N·m)
Important Notes
Torque values are estimated based on industry standards. Tighten bolts in a crisscross pattern to avoid warping the evaporator.
Ac Refrigerant Lines
1 A/C Refrigerant Line Clamp Bolts
M6 x 1.0
1
A/C Refrigerant Line Clamp Bolts
M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Torque values are estimated based on industry standards. Avoid overtightening to prevent damage to the refrigerant lines.
Suspension
Torque specifications for Suspension
Suspension
Torque specifications for Suspension
Front Suspension
1 Strut/Shock Absorber Mounting Bolts
M14 x 1.5
1
Strut/Shock Absorber Mounting Bolts
M14 x 1.5
Torque Specification
77 ft-lbs (105 N·m)
Important Notes
Estimated average value for 74-81 ft-lbs (100-110 Nm) range.
2 Control Arm Bolts
M14 x 1.5
2
Control Arm Bolts
M14 x 1.5
Torque Specification
77 ft-lbs (105 N·m)
Important Notes
Estimated average value for 74-81 ft-lbs (100-110 Nm) range.
3 Ball Joint Nut
M16 x 1.5
3
Ball Joint Nut
M16 x 1.5
Torque Specification
77 ft-lbs (105 N·m)
Important Notes
Estimated average value for 74-81 ft-lbs (100-110 Nm) range.
4 Upper Control Arm Bushing Bolts
M12 x 1.25
4
Upper Control Arm Bushing Bolts
M12 x 1.25
Torque Specification
42 ft-lbs (57 N·m)
Important Notes
Estimated average value for 40-45 ft-lbs (55-61 Nm) range.
5 Lower Control Arm Bolts
M16 x 1.5
5
Lower Control Arm Bolts
M16 x 1.5
Torque Specification
62 ft-lbs (84 N·m)
Important Notes
Estimated average value for 60-65 ft-lbs (80-90 Nm) range.
Steering System
1 Tie Rod End Nut
M14 x 1.5
1
Tie Rod End Nut
M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated average value for 33-37 ft-lbs (45-50 Nm) range.
2 Steering Gear/Rack Bolts
M16 x 1.5
2
Steering Gear/Rack Bolts
M16 x 1.5
Torque Specification
77 ft-lbs (105 N·m)
Important Notes
Estimated average value for 74-81 ft-lbs (100-110 Nm) range.
Stabilizer Bar and Coil Spring
1 Stabilizer Bar Mounting Bolts
M12 x 1.25
1
Stabilizer Bar Mounting Bolts
M12 x 1.25
Torque Specification
42 ft-lbs (57 N·m)
Important Notes
Estimated average value for 40-45 ft-lbs (55-61 Nm) range.
2 Coil Spring Mounting Bolts
M12 x 1.25
2
Coil Spring Mounting Bolts
M12 x 1.25
Torque Specification
42 ft-lbs (57 N·m)
Important Notes
Estimated average value for 40-45 ft-lbs (55-61 Nm) range.
3 Sway Bar Link Nut
M14 x 1.5
3
Sway Bar Link Nut
M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated average value for 33-37 ft-lbs (45-50 Nm) range.
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
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
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 specification for cylinder head bolts on a 2011-2018 Mercedes b-class?
Q1
What IS the recommended torque specification for cylinder head bolts on a 2011-2018 Mercedes b-class?
According to Mercedes technical specifications, the cylinder head bolts should be tightened to 80 Nm (59.0 lb-ft) in three stages: 40 Nm (29.5 lb-ft), 60 Nm (44.3 lb-ft), and 80 Nm (59.0 lb-ft).
Q2 What IS the proper tightening procedure for lug nuts on a Mercedes b-class?
Q2
What IS the proper tightening procedure for lug nuts on a Mercedes b-class?
Ensure the wheel mounting surface IS clean. Hand-tighten the lug nuts onto the wheel bolts, then use a calibrated torque wrench to tighten each lug nut to 110 Nm (81.1 lb-ft) in a star pattern.
Q3 What IS the torque specification for the crankshaft pulley bolt on a 2011-2018 Mercedes b-class?
Q3
What IS the torque specification for the crankshaft pulley bolt on a 2011-2018 Mercedes b-class?
The crankshaft pulley bolt should be tightened to 150 Nm (110.6 lb-ft) plus an additional 90 degrees of rotation.
Q4 What are the torque specifications for the spark plugs on a Mercedes b-class?
Q4
What are the torque specifications for the spark plugs on a Mercedes b-class?
The spark plugs should be tightened to 25 Nm (18.4 lb-ft) using a torque wrench.
Q5 Can I use a regular torque wrench for my Mercedes b-class?
Q5
Can I use a regular torque wrench for my Mercedes b-class?
It IS recommended to use a calibrated torque wrench specifically designed for automotive applications to ensure accurate torque readings and prevent over-tightening.
Q6 What are the consequences of over-tightening bolts?
Q6
What are the consequences of over-tightening bolts?
Over-tightening bolts can stretch or even break the bolt, damage threads, and cause premature component failure.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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 b-class.
- Digital display for accurate readings
- Audible alarm when target torque IS reached
- Multiple units (Nm, ft-lb, in-lb)
- Reversible ratcheting mechanism
Service Procedures
Engine Head Bolt Torque Sequence
Technical procedure for tightening cylinder head bolts in the correct sequence and torque specifications
- Install the cylinder head bolts in the correct order as per the diagram.
- Tighten the bolts to the specified torque in three stages:
- - Stage 1: 30 Nm
- - Stage 2: 60 Nm
- - Stage 3: Final torque of 90 Nm + 90 degrees
- Double-check the torque using a torque wrench for accuracy.
Wheel Lug Nut Torque
Procedure for tightening wheel lug nuts to the correct torque specifications
- Clean the wheel mounting surface and the lug nuts.
- Install the lug nuts onto the wheel bolts hand-tight.
- Tighten the lug nuts in a star pattern using a torque wrench to 120 Nm.
- Double-check the torque using a torque wrench for accuracy.
Brake Caliper Bracket Bolt Torque
Instructions for tightening brake caliper bracket bolts to the correct torque specifications
- Locate the caliper bracket bolts.
- Clean the bolt threads and the mounting surface.
- Apply a small amount of thread locker to the bolts.
- Tighten the caliper bracket bolts to 80 Nm.
- Double-check the torque using a torque wrench for accuracy.
Technical Service Bulletins
Technical Service Bulletin: Incorrect Engine Head Bolt Torque Specifications
2016-03-15Bulletin addressing incorrect engine head bolt torque specifications in early production models
2011-2013 b-class
Resolution: Re-torque cylinder head bolts to the correct specifications as outlined in the updated service procedure.
Technical Service Bulletin: Wheel Lug Nut Recall
2017-10-01Bulletin announcing a recall for defective wheel lug nuts
2014-2018 b-class
Resolution: Replace all wheel lug nuts with updated, non-defective parts.
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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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