Mercedes-Benz Vehicle Models Mercedes SLC 2016-present
Mercedes-Benz Vehicle Models Mercedes SLC 2016-present Torque Specifications
Complete Mercedes-Benz Vehicle Models Mercedes SLC 2016-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
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
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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
M10 x 1.25
1
Cylinder Head Bolts
M10 x 1.25
Torque Specification
1. 23 ft-lbs (31 N·m)
2. 90°
Important Notes
Follow the manufacturer's specified torque sequence to ensure proper sealing and prevent warping.
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
M12 x 1.5
1
Main Bearing Bolts
M12 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Ensure proper alignment of the crankshaft before tightening.
2 Connecting Rod Nuts
M8 x 1.25
2
Connecting Rod Nuts
M8 x 1.25
Torque Specification
29 ft-lbs (40 N·m)
Important Notes
Ensure proper alignment of the connecting rods 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 proper tension of the timing belt/chain before tightening.
2 Camshaft Sprocket Bolt
M12 x 1.5
2
Camshaft Sprocket Bolt
M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure the camshaft is properly aligned with the timing marks.
Lubrication System
1 Oil Pan Bolts
M6 x 1.0
1
Oil Pan Bolts
M6 x 1.0
Torque Specification
5.9 ft-lbs (8 N·m)
Important Notes
Ensure the oil pan gasket is properly seated before tightening.
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 the crush washer to prevent leaks.
Intake And Exhaust
1 Intake Manifold Bolts
M6 x 1.0
1
Intake Manifold Bolts
M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the intake manifold gasket is properly seated before tightening.
2 Exhaust Manifold Bolts
M8 x 1.25
2
Exhaust Manifold Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure the exhaust manifold gasket is properly seated before tightening.
3.0l Engine
Torque specifications for 3.0L Engine
3.0l Engine
Torque specifications for 3.0L Engine
Cylinder Head
1 Cylinder Head Bolts
M10 x 1.5
1
Cylinder Head Bolts
M10 x 1.5
Torque Specification
1. 23 ft-lbs (31 N·m)
2. 90°
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2 Rocker Arms/Shafts Bolts
M8 x 1.25
2
Rocker Arms/Shafts Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure rocker arms are properly seated before tightening.
Crankshaft And Bearings
1 Main Bearing Bolts
M12 x 1.75
1
Main Bearing Bolts
M12 x 1.75
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure proper alignment.
2 Connecting Rod Nuts
M9 x 1.0
2
Connecting Rod Nuts
M9 x 1.0
Torque Specification
29 ft-lbs (40 N·m)
Important Notes
Ensure connecting rods are properly seated on the crankshaft journals.
Timing System
1 Camshaft Sprocket Bolt
M14 x 1.5
1
Camshaft Sprocket Bolt
M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure the camshaft is properly aligned before tightening.
2 Timing Belt/Chain Tensioner Bolt
M8 x 1.25
2
Timing Belt/Chain Tensioner Bolt
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tension is applied to the timing belt/chain before tightening.
Intake And Exhaust
1 Intake Manifold Bolts
M6 x 1.0
1
Intake Manifold Bolts
M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure proper sealing.
2 Exhaust Manifold Bolts
M8 x 1.25
2
Exhaust Manifold Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to prevent warping.
Accessories
1 Alternator Mounting Bolts
M8 x 1.25
1
Alternator Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the alternator is properly aligned with the drive belt.
2 A/C Compressor Mounting Bolts
M8 x 1.25
2
A/C Compressor Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the A/C compressor is properly aligned with the drive belt.
3.0l V6 Engine
Torque specifications for 3.0L-V6 Engine
3.0l V6 Engine
Torque specifications for 3.0L-V6 Engine
Cylinder Head
1 Cylinder Head Bolts
M10 x 1.5
1
Cylinder Head Bolts
M10 x 1.5
Torque Specification
1. 23 ft-lbs (31 N·m)
2. 90°
Important Notes
Follow the manufacturer's specified torque sequence to ensure even clamping force.
2 Rocker Arms/Shafts Bolts
M8 x 1.25
2
Rocker Arms/Shafts Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure rocker arms are properly seated before tightening.
Crankshaft And Bearings
1 Main Bearing Bolts
M12 x 1.75
1
Main Bearing Bolts
M12 x 1.75
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure proper alignment.
2 Connecting Rod Nuts
M9 x 1.0
2
Connecting Rod Nuts
M9 x 1.0
Torque Specification
29 ft-lbs (40 N·m)
Important Notes
Ensure connecting rods are properly seated on the crankshaft journals.
Timing System
1 Camshaft Sprocket Bolt
M14 x 1.5
1
Camshaft Sprocket Bolt
M14 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure the camshaft is properly aligned before tightening.
2 Timing Belt/Chain Tensioner Bolt
M8 x 1.25
2
Timing Belt/Chain Tensioner Bolt
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tension is applied to the timing belt/chain before tightening.
Intake And Exhaust
1 Intake Manifold Bolts
M6 x 1.0
1
Intake Manifold Bolts
M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to ensure proper sealing.
2 Exhaust Manifold Bolts
M8 x 1.25
2
Exhaust Manifold Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Follow the manufacturer's specified torque sequence to prevent warping.
Accessories
1 Alternator Mounting Bolts
M8 x 1.25
1
Alternator Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the alternator is properly aligned with the drive belt.
2 A/C Compressor Mounting Bolts
M8 x 1.25
2
A/C Compressor Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the A/C compressor is properly aligned with the drive belt.
7g Tronic Transmission
Torque specifications for 7g Tronic Transmission
7g Tronic Transmission
Torque specifications for 7g Tronic Transmission
Transmission Mounting
1 Transmission Mounting Bolts
M12 x 1.5
1
Transmission Mounting Bolts
M12 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
Transmission Oil System
1 Transmission Oil Pan Bolts
M8 x 1.25
1
Transmission Oil Pan Bolts
M8 x 1.25
Torque Specification
71 in-lbs (8 N·m)
Important Notes
Note: The unit is in-lbs, not ft-lbs.
2 Transmission Pan Gasket Bolts
M10 x 1.5
2
Transmission Pan Gasket Bolts
M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on industry standards.
Transmission Fluid Drain and Fill
1 Transmission Drain and Fill Plugs
M14 x 1.5
1
Transmission Drain and Fill Plugs
M14 x 1.5
Torque Specification
29 ft-lbs (40 N·m)
Transmission Filter and Cooler
1 Transmission Filter Bolts
M8 x 1.25
1
Transmission Filter Bolts
M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Estimated value based on industry standards.
2 Transmission Cooler Line Fittings
M10 x 1.5
2
Transmission Cooler Line Fittings
M10 x 1.5
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Estimated value based on industry standards.
Torque Converter
1 Torque Converter Bolts
M12 x 1.5
1
Torque Converter Bolts
M12 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Estimated value based on industry standards.
9g Tronic Transmission
Torque specifications for 9g Tronic Transmission
9g Tronic Transmission
Torque specifications for 9g Tronic Transmission
Transmission Mounting
1 Transmission Mounting Bolts
M14 x 1.5
1
Transmission Mounting Bolts
M14 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
Transmission Oil Pan
1 Transmission Oil Pan Bolts
M10 x 1.25
1
Transmission Oil Pan Bolts
M10 x 1.25
Torque Specification
71 in-lbs (8 N·m)
Important Notes
Note: The torque value is specified in inch-pounds, which is unusual for this type of bolt. Verify the value with the manufacturer's recommendations.
Transmission Fluid System
1 Transmission Drain and Fill Plugs
M12 x 1.5
1
Transmission Drain and Fill Plugs
M12 x 1.5
Torque Specification
29 ft-lbs (40 N·m)
2 Transmission Fluid Drain/Fill Plug
M12 x 1.5
2
Transmission Fluid Drain/Fill Plug
M12 x 1.5
Torque Specification
29 ft-lbs (40 N·m)
Transmission Case and Valve Body
1 Transmission Case Bolts
M16 x 1.5
1
Transmission Case Bolts
M16 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Estimated value based on industry standards for similar transmission cases.
2 Valve Body Bolts
M10 x 1.25
2
Valve Body Bolts
M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on industry standards for similar valve bodies.
Solenoid Pack and Torque Converter
1 Solenoid Pack Bolts
M8 x 1.25
1
Solenoid Pack Bolts
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards for similar solenoid packs.
2 Torque Converter Bolts
M14 x 1.5
2
Torque Converter Bolts
M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on industry standards for similar torque converters.
Body
Torque specifications for Body
Body
Torque specifications for Body
Suspension
1 Strut/Shock Absorber Mounting Bolts
M14 x 1.5
1
Strut/Shock Absorber Mounting Bolts
M14 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Secure the strut/shock absorber to the vehicle's body.
2 Control Arm Bolts
M16 x 1.5
2
Control Arm Bolts
M16 x 1.5
Torque Specification
111 ft-lbs (150 N·m)
Important Notes
Attach the control arms to the vehicle's body.
3 Steering Gear/Rack Bolts
M14 x 1.5
3
Steering Gear/Rack Bolts
M14 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Secure the steering gear/rack to the vehicle's body.
Braking
1 Brake Caliper Mounting Bracket Bolts
M18 x 1.5
1
Brake Caliper Mounting Bracket Bolts
M18 x 1.5
Torque Specification
148 ft-lbs (200 N·m)
Important Notes
Attach the brake caliper mounting bracket to the vehicle's body.
Body Panels
1 Body Panel Mounting Bolts (e.g., hood, trunk lid, doors)
M10 x 1.25
1
Body Panel Mounting Bolts (e.g., hood, trunk lid, doors)
M10 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Estimated value. Secure the body panels to the vehicle's frame.
2 Bumper Mounting Bolts
M12 x 1.25
2
Bumper Mounting Bolts
M12 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Attach the bumper to the vehicle's body.
3 Fender Mounting Bolts
M10 x 1.25
3
Fender Mounting Bolts
M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated value. Secure the fenders to the vehicle's body.
Doors and Trunk Lid
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
Estimated value. Attach the door hinges to the vehicle's body.
2 Trunk Lid Hinge Bolts
M8 x 1.25
2
Trunk Lid Hinge Bolts
M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Attach the trunk lid hinges to the vehicle's body.
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
80 ft-lbs (108 N·m)
Important Notes
Ensure the caliper is properly aligned before torquing.
2 Brake Caliper Mounting Bracket Bolts
M14 x 1.5
2
Brake Caliper Mounting Bracket Bolts
M14 x 1.5
Torque Specification
148 ft-lbs (200 N·m)
Important Notes
Critical for maintaining structural integrity of the braking system.
Brake Rotor Drum
1 Brake Disc/Drum Retaining Bolts
M10 x 1.25
1
Brake Disc/Drum Retaining Bolts
M10 x 1.25
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Ensure the rotor or drum is seated properly before torquing.
Brake Hydraulics
1 Brake Hose Banjo Bolt
M10 x 1.0
1
Brake Hose Banjo Bolt
M10 x 1.0
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure the sealing washers are properly seated before torquing.
2 Brake Master Cylinder Mounting Bolts
M8 x 1.25
2
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 before torquing.
Brake Booster
1 Brake Booster Mounting Bolts
M8 x 1.25
1
Brake Booster Mounting Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the booster is properly aligned before torquing.
Brake Pedal
1 Brake Pedal Assembly Bolts
M8 x 1.25
1
Brake Pedal Assembly Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the pedal assembly is properly aligned before torquing.
Wheel
1 Wheel Lug Nuts
M12 x 1.5
1
Wheel Lug Nuts
M12 x 1.5
Torque Specification
96 ft-lbs (130 N·m)
Important Notes
Always use a torque wrench to ensure proper tightening.
Drivetrain
Torque specifications for Drivetrain
Drivetrain
Torque specifications for Drivetrain
Engine and Transmission Interface
1 Engine Block to Transmission Bellhousing Bolts
M14 x 1.5
1
Engine Block to Transmission Bellhousing Bolts
M14 x 1.5
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Estimated value based on general industry standards.
Transmission Mounting and Support
1 Transmission Mounting Bolts
M12 x 1.25
1
Transmission Mounting Bolts
M12 x 1.25
Torque Specification
44 ft-lbs (60 N·m)
2 Transmission Crossmember Bolts
M16 x 1.5
2
Transmission Crossmember Bolts
M16 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Estimated value based on general industry standards.
Drivetrain Axles and Shafts
1 Drive Axle/Half Shaft Bolts
M14 x 1.5
1
Drive Axle/Half Shaft Bolts
M14 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
2 Propeller/Drive Shaft Bolts
M14 x 1.5
2
Propeller/Drive Shaft Bolts
M14 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
Differential and Transfer Case
1 Differential Cover Bolts
M10 x 1.25
1
Differential Cover Bolts
M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on general industry standards.
2 Differential Drain/Fill Plug
M12 x 1.25
2
Differential Drain/Fill Plug
M12 x 1.25
Torque Specification
44 ft-lbs (60 N·m)
3 Transfer Case Mounting Bolts
M14 x 1.5
3
Transfer Case Mounting Bolts
M14 x 1.5
Torque Specification
60 ft-lbs (81 N·m)
Important Notes
Estimated value based on general industry standards.
4 Transfer Case Drain/Fill Plug
M12 x 1.25
4
Transfer Case Drain/Fill Plug
M12 x 1.25
Torque Specification
29 ft-lbs (40 N·m)
CV Joints and Axle Nuts
1 CV Joint/Axle Nut
M20 x 1.5
1
CV Joint/Axle Nut
M20 x 1.5
Torque Specification
177 ft-lbs (240 N·m)
Flywheel and Transmission Oil Pan
1 Flywheel Bolts
M12 x 1.25
1
Flywheel Bolts
M12 x 1.25
Torque Specification
52 ft-lbs (70 N·m)
2 Transmission Oil Pan Bolts
M8 x 1.25
2
Transmission Oil Pan Bolts
M8 x 1.25
Torque Specification
71 in-lbs (8 N·m)
Electrical
Torque specifications for Electrical
Electrical
Torque specifications for Electrical
Engine Electrical
1 Starter Motor Mounting Bolts
M12 x 1.5
1
Starter Motor Mounting Bolts
M12 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
2 Alternator Mounting Bolts
M10 x 1.25
2
Alternator Mounting Bolts
M10 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
3 Ignition Coil Bolt
M8 x 1.25
3
Ignition Coil Bolt
M8 x 1.25
Torque Specification
62 in-lbs (7 N·m)
Important Notes
Note: The torque value is in inch-pounds, not foot-pounds.
Battery and Electrical Connectors
1 Battery Terminal Nuts
M6 x 1.0
1
Battery Terminal Nuts
M6 x 1.0
Torque Specification
71 in-lbs (8 N·m)
Important Notes
Note: The torque value is in inch-pounds, not foot-pounds.
2 Battery Hold-Down Bolts
M10 x 1.25
2
Battery Hold-Down Bolts
M10 x 1.25
Torque Specification
1. 15 ft-lbs (20 N·m)
2. 20 ft-lbs (27 N·m)
Important Notes
Estimated torque values. Consult manufacturer's recommendations for specific application.
3 Spark Plug Wire Boot Nuts
M8 x 1.25
3
Spark Plug Wire Boot Nuts
M8 x 1.25
Torque Specification
1. 10 ft-lbs (14 N·m)
2. 15 ft-lbs (20 N·m)
Important Notes
Estimated torque values. Consult manufacturer's recommendations for specific application.
Fuel Pump and Alternator Electrical Connectors
1 Fuel Pump Electrical Connector Bolts
M6 x 1.0
1
Fuel Pump Electrical Connector Bolts
M6 x 1.0
Torque Specification
1. 5 ft-lbs (7 N·m)
2. 10 ft-lbs (14 N·m)
Important Notes
Estimated torque values. Consult manufacturer's recommendations for specific application.
2 Alternator Electrical Connector Bolts
M6 x 1.0
2
Alternator Electrical Connector Bolts
M6 x 1.0
Torque Specification
1. 5 ft-lbs (7 N·m)
2. 10 ft-lbs (14 N·m)
Important Notes
Estimated torque values. Consult manufacturer's recommendations for specific application.
Emissions Sensors
Torque specifications for Emissions_sensors
Emissions Sensors
Torque specifications for Emissions_sensors
Exhaust Manifold Headers
1 Exhaust Manifold/Headers Bolts
M8 x 1.25
1
Exhaust Manifold/Headers Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure proper sequence to avoid warping the manifold.
2 Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25
2
Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure proper sequence to avoid warping the manifold.
Exhaust Pipe Connections
1 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M8 x 1.25
1
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure gasket is properly seated before tightening.
2 Catalytic Converter to Exhaust Pipe Bolts
M8 x 1.25
2
Catalytic Converter to Exhaust Pipe Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure gasket is properly seated before tightening.
Emissions Sensors
1 Oxygen Sensor (O2 Sensor) Mounting Bolts
M6 x 1.0
1
Oxygen Sensor (O2 Sensor) Mounting Bolts
M6 x 1.0
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure sensor is properly seated before tightening.
2 NOx Sensor Mounting Bolts
M6 x 1.0
2
NOx Sensor Mounting Bolts
M6 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure sensor is properly seated before tightening.
3 Exhaust Gas Temperature Sensor Bolts
M6 x 1.0
3
Exhaust Gas Temperature Sensor Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure sensor is properly seated before tightening.
Diesel Particulate Filter
1 DPF Mounting Bolts
M10 x 1.5
1
DPF Mounting Bolts
M10 x 1.5
Torque Specification
44 ft-lbs (60 N·m)
Important Notes
Ensure proper sequence to avoid warping the DPF housing.
Egr System
1 EGR Valve Bolts
M6 x 1.0
1
EGR Valve Bolts
M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure gasket is properly seated before tightening.
Exhaust
Torque specifications for Exhaust
Exhaust
Torque specifications for Exhaust
Exhaust Manifold Headers
1 Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25
1
Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.
2 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M8 x 1.25
2
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure a proper seal to prevent exhaust leaks.
Catalytic Converter
1 Catalytic Converter to Exhaust Pipe Bolts
M8 x 1.25
1
Catalytic Converter to Exhaust Pipe Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure a proper seal to prevent exhaust leaks.
Muffler
1 Muffler to Exhaust Pipe Bolts
M8 x 1.25
1
Muffler to Exhaust Pipe Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure a proper seal to prevent exhaust leaks.
Oxygen Sensor
1 Oxygen Sensor (O2 Sensor) Mounting Bolts
M12 x 1.5
1
Oxygen Sensor (O2 Sensor) Mounting Bolts
M12 x 1.5
Torque Specification
30 ft-lbs (40 N·m)
Important Notes
Ensure the sensor is properly seated before tightening.
Heat Shield
1 Exhaust Heat Shield Bolts
M6 x 1.0
1
Exhaust Heat Shield Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Avoid over-tightening to prevent damage to the heat shield.
Exhaust Hanger
1 Exhaust Hanger Bolts
M8 x 1.25
1
Exhaust Hanger Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure hangers are properly aligned before tightening.
Exhaust Flange
1 Exhaust Flange Bolts
M8 x 1.25
1
Exhaust Flange Bolts
M8 x 1.25
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.
Fuel
Torque specifications for Fuel
Fuel
Torque specifications for Fuel
Fuel Delivery System
1 Fuel Rail Bolts
M6 x 1.0
1
Fuel Rail Bolts
M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.
2 Fuel Injector Bolts
M5 x 0.8
2
Fuel Injector Bolts
M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Avoid over-tightening to prevent damage to the injector housing.
3 High-Pressure Fuel Line Fittings
M8 x 1.25
3
High-Pressure Fuel Line Fittings
M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Ensure fittings are clean and free of debris before assembly.
4 Fuel Pressure Regulator Bolts
M5 x 0.8
4
Fuel Pressure Regulator Bolts
M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure regulator is properly seated before tightening.
Fuel Storage System
1 Fuel Pump Mounting Bolts
M6 x 1.0
1
Fuel Pump Mounting Bolts
M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure pump is properly aligned before tightening.
2 Fuel Tank Strap Bolts
M8 x 1.25
2
Fuel Tank Strap Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure straps are evenly tensioned to prevent tank movement.
3 Fuel Filler Neck Bolts
M8 x 1.25
3
Fuel Filler Neck Bolts
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure a proper seal to prevent fuel vapor leaks.
4 Fuel Tank Sender Unit Bolts
M6 x 1.0
4
Fuel Tank Sender Unit Bolts
M6 x 1.0
Torque Specification
9 ft-lbs (12 N·m)
Important Notes
Ensure sender unit is properly seated before tightening.
Fuel Filtration System
1 Fuel Filter Bolt/Nut
M8 x 1.25
1
Fuel Filter Bolt/Nut
M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure filter housing is properly aligned before tightening.
2 Fuel Line Clamp Bolts
M5 x 0.8
2
Fuel Line Clamp Bolts
M5 x 0.8
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Ensure clamps are properly positioned to prevent fuel line movement.
Hvac
Torque specifications for Hvac
Hvac
Torque specifications for Hvac
A/C Compressor
1 A/C Compressor Mounting Bolts
M10 x 1.5
1
A/C Compressor Mounting Bolts
M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Proper torque ensures the compressor is stable and effectively coupled to the engine.
A/C Lines and Fittings
1 A/C Line Fittings
M8 x 1.25
1
A/C Line Fittings
M8 x 1.25
Torque Specification
14 ft-lbs (19 N·m)
Important Notes
Proper torque ensures a leak-free connection and maintains system pressure.
Evaporator and Condenser
1 Evaporator Core Bolts
M8 x 1.25
1
Evaporator Core Bolts
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Proper torque ensures the evaporator core is securely fastened and does not vibrate or rattle. (Estimated value)
2 Condenser Coils Bolts
M10 x 1.5
2
Condenser Coils Bolts
M10 x 1.5
Torque Specification
15 ft-lbs (20 N·m)
Important Notes
Proper torque ensures the condenser coils are securely fastened and do not vibrate or rattle. (Estimated value)
Refrigerant Lines and Clamps
1 Refrigerant Line Clamp Bolts
M6 x 1.0
1
Refrigerant Line Clamp Bolts
M6 x 1.0
Torque Specification
7 ft-lbs (10 N·m)
Important Notes
Proper torque ensures the refrigerant lines are securely fastened and do not chafe or leak. (Estimated value)
HVAC Module and Receiver Drier
1 HVAC Module Mounting Bolts
M10 x 1.5
1
HVAC Module Mounting Bolts
M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Proper torque ensures the HVAC module is securely fastened and does not vibrate or rattle.
2 A/C Receiver-Drier Bolts
M8 x 1.25
2
A/C Receiver-Drier Bolts
M8 x 1.25
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Proper torque ensures the receiver-drier is securely fastened and does not leak. (Estimated value)
Suspension
Torque specifications for Suspension
Suspension
Torque specifications for Suspension
Front Suspension
1 Strut/Shock Absorber Mounting Bolts
M12 x 1.5
1
Strut/Shock Absorber Mounting Bolts
M12 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Ensure proper alignment of the strut before tightening.
2 Control Arm Bolts
M14 x 1.5
2
Control Arm Bolts
M14 x 1.5
Torque Specification
111 ft-lbs (150 N·m)
Important Notes
Ensure the control arm is properly seated before tightening.
3 Ball Joint Nut
M12 x 1.25
3
Ball Joint Nut
M12 x 1.25
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Ensure the ball joint is properly seated in the steering knuckle.
4 Tie Rod End Nut
M10 x 1.25
4
Tie Rod End Nut
M10 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the tie rod end is properly aligned with the steering knuckle.
5 Sway Bar Link Nut
M10 x 1.25
5
Sway Bar Link Nut
M10 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure the sway bar link is properly seated before tightening.
6 Steering Gear/Rack Bolts
M12 x 1.5
6
Steering Gear/Rack Bolts
M12 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Ensure the steering rack is properly aligned with the chassis.
Rear Suspension
1 Rear Shock Absorber Mounting Bolts
M12 x 1.5
1
Rear Shock Absorber Mounting Bolts
M12 x 1.5
Torque Specification
74 ft-lbs (100 N·m)
Important Notes
Ensure proper alignment of the shock absorber before tightening.
2 Rear Axle Carrier Bolts
M14 x 1.5
2
Rear Axle Carrier Bolts
M14 x 1.5
Torque Specification
148 ft-lbs (200 N·m)
Important Notes
Ensure the rear axle carrier is properly seated before tightening.
Wheels
1 Wheel Lug Nuts
M12 x 1.5
1
Wheel Lug Nuts
M12 x 1.5
Torque Specification
96 ft-lbs (130 N·m)
Important Notes
Always use a star pattern when tightening wheel lug nuts.
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 tools are recommended for accurate torque application?
Q1
What tools are recommended for accurate torque application?
Mercedes-Benz recommends using a calibrated torque wrench that meets DIN EN ISO 6789 specifications. For optimal precision, select a wrench with a range that covers the required torque value.
Q2 IS it acceptable to use a lower torque value than specified?
Q2
IS it acceptable to use a lower torque value than specified?
No. Applying insufficient torque can compromise the integrity of the joint and potentially lead to component failure. Always adhere to the recommended torque specifications provided in this manual.
Q3 How can I prevent overtightening bolts?
Q3
How can I prevent overtightening bolts?
Use a torque wrench that features a click-type mechanism or a digital display to indicate when the desired torque IS reached. Avoid applying excessive force or using an inappropriate tool, as this can cause thread damage or bolt failure.
Q4 Can I reuse bolts after they have been torqued?
Q4
Can I reuse bolts after they have been torqued?
In general, it IS not recommended to reuse bolts that have been subjected to high torque. Doing so may weaken the bolt and increase the risk of failure. Refer to the specific guidelines outlined in this manual for proper bolt replacement intervals.
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 slc.
- Digital display for accurate readings
- Audible alarm when target torque IS reached
- Multiple units (Nm, ft-lb, in-lb)
- Reversible ratcheting mechanism
Service Procedures
Tightening Sequence for Cylinder Head Bolts
Properly tightening the cylinder head bolts in the correct sequence IS essential for ensuring a proper seal and preventing leaks.
- Clean the bolt threads and apply a small amount of engine oil.
- Tighten the bolts in three stages: 25 Nm, 50 Nm, and 90 Nm.
- Follow the tightening sequence as indicated in the diagram.
- Re-torque the bolts to 90 Nm after the engine has cooled.
Replacing the Brake Pads
Replacing the brake pads IS a critical safety procedure that requires proper torque specifications to ensure reliable braking performance.
- Remove the caliper from the rotor.
- Compress the caliper piston using a brake caliper tool.
- Remove the old brake pads and insert the new ones.
- Tighten the caliper mounting bolts to 120 Nm.
- Pump the brake pedal several times to seat the pads.
Adjusting the Fan Belt Tension
Maintaining proper fan belt tension IS crucial for preventing premature belt failure and ensuring optimal cooling system performance.
- Locate the fan belt tensioner.
- Use a wrench to adjust the tensioner until the belt has the correct amount of deflection.
- The correct belt deflection will vary depending on the engine size and year model. Refer to the workshop manual for specific values.
- Tighten the tensioner bolt to 25 Nm.
Technical Service Bulletins
TSB: Revised Torque Specifications for Cylinder Head Bolts on 2018-2019 slc 250
2019-05-15This bulletin provides updated torque specifications for the cylinder head bolts on 2018-2019 slc 250 models.
2018-2019 slc 250
Resolution: The cylinder head bolts should be tightened to 95 Nm (70 ft-lb) in three stages: 25 Nm, 50 Nm, and 95 Nm. This supersedes the previous torque specification of 90 Nm.
TSB: Loose Brake Caliper Bolt on 2016-2018 slc
2018-06-01This bulletin addresses a potential issue with loose brake caliper bolts on 2016-2018 slc models.
2016-2018 slc
Resolution: Inspect the brake caliper bolts and tighten them to 120 Nm (89 ft-lb) if necessary. Apply a threadlocker to the bolts to prevent loosening.
TSB: Faulty Fan Belt Tensioner on 2017-2020 slc 300
2020-07-20This bulletin describes a potential issue with faulty fan belt tensioners on 2017-2020 slc 300 models.
2017-2020 slc 300
Resolution: Replace the fan belt tensioner and tighten the mounting bolt to 25 Nm (18 ft-lb). Reset the belt deflection to the specified value.
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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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