Audi Audi S5 2007-2016 4.2L Engine Bolt Torque Specifications
Comprehensive guide to bolt torque specifications for the 4.2L V8 engine found in the 2007-2016 Audi S5 (B8/8T) model. Includes torque values for various engine components.
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
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.
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.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
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.
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.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
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
Engine External
Torque specifications for components mounted externally to the engine block, such as accessories and manifolds.
1 Crankshaft Pulley Bolt
M18 x 2.0
Crankshaft Pulley Bolt
M18 x 2.0Important Notes
2 Alternator Bolts
M8 x 1.25
Alternator Bolts
M8 x 1.25Torque Value
Important Notes
3 Power Steering Pump Bolts
M8 x 1.25
Power Steering Pump Bolts
M8 x 1.25Torque Value
Important Notes
4 A/C Compressor Bolts
M8 x 1.25
A/C Compressor Bolts
M8 x 1.25Torque Value
Important Notes
5 Starter Bolts
M10 x 1.5
Starter Bolts
M10 x 1.5Torque Value
Important Notes
6 Engine Mount to Engine Bolts
M10 x 1.5
Engine Mount to Engine Bolts
M10 x 1.5Torque Value
Important Notes
7 Engine Mount to Chassis Bolts
M12 x 1.75
Engine Mount to Chassis Bolts
M12 x 1.75Important Notes
8 Intake Manifold Bolts
M6 x 1.0
Intake Manifold Bolts
M6 x 1.0Torque Value
Important Notes
9 Throttle Body Bolts
M6 x 1.0
Throttle Body Bolts
M6 x 1.0Torque Value
Important Notes
10 Exhaust Manifold to Cylinder Head Bolts
M8 x 1.25 (Stud & Nut)
Exhaust Manifold to Cylinder Head Bolts
M8 x 1.25 (Stud & Nut)Torque Value
Important Notes
Engine Internal
Torque specifications for internal engine components, requiring specific sequences and procedures.
1 Cylinder Head Bolts
M12 x 1.75
Cylinder Head Bolts
M12 x 1.75Important Notes
2 Main Bearing Cap Bolts
M10 x 1.5
Main Bearing Cap Bolts
M10 x 1.5Important Notes
3 Connecting Rod Cap Bolts
M9 x 1.25
Connecting Rod Cap Bolts
M9 x 1.25Important Notes
4 Oil Pan Bolts
M6 x 1.0
Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
5 Oil Pump Bolts
M6 x 1.0
Oil Pump Bolts
M6 x 1.0Torque Value
Important Notes
6 Camshaft Bearing Cap Bolts
M6 x 1.0
Camshaft Bearing Cap Bolts
M6 x 1.0Torque Value
Important Notes
Cooling System
Torque specifications for cooling system components.
1 Water Pump Bolts
M6 x 1.0
Water Pump Bolts
M6 x 1.0Torque Value
Important Notes
2 Thermostat Housing Bolts
M6 x 1.0
Thermostat Housing Bolts
M6 x 1.0Torque Value
Important Notes
Other
Torque specifications for miscellaneous components.
1 Valve Cover Bolts
M6 x 1.0
Valve Cover Bolts
M6 x 1.0Torque Value
Important Notes
2 Camshaft Position Sensor Bolt
M6 x 1.0
Camshaft Position Sensor Bolt
M6 x 1.0Torque Value
Important Notes
3 Knock Sensor Bolts
M8 x 1.25
Knock Sensor Bolts
M8 x 1.25Torque Value
Important Notes
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
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
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
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 Why are correct torque specifications so important?
Why are correct torque specifications so important?
Using the correct torque specifications is crucial for ensuring proper clamping force and preventing damage. Over-tightening can lead to stripped threads, bolt failure, and component damage, while under-tightening can result in leaks, loosening, and potential engine failure. For example, over-torquing a cylinder head bolt can cause head warping or cracking, and under-torquing can cause a head gasket failure.
Q2 What type of torque wrench should I use?
What type of torque wrench should I use?
A calibrated torque wrench is essential. For the 4.2L V8 engine in your Audi S5, a range of torque wrenches is needed, typically including smaller drive wrenches for intake and sensor bolts and larger drive wrenches for the cylinder head and main bearing bolts. Digital torque wrenches are more accurate and should be used whenever possible. Always double check your wrench is calibrated.
Q3 What happens if I don't have the exact torque spec for a specific bolt?
What happens if I don't have the exact torque spec for a specific bolt?
Never guess or use generic torque specifications. Always consult the official Audi repair manual or a reliable database specific to the 4.2L V8 engine. Using incorrect torque values can lead to serious problems. If you are unable to find exact specs it's best to stop and wait until you are sure rather than make the mistake of torquing it incorrectly.
Q4 Should I use new bolts or fasteners each time I disassemble the engine?
Should I use new bolts or fasteners each time I disassemble the engine?
Yes, it is strongly recommended to use new bolts, especially for critical components such as cylinder head bolts, connecting rod bolts, and main bearing cap bolts. These bolts often stretch or yield when torqued to their specification and reusing them can compromise their integrity. These one-use bolts should be replaced to ensure a safe repair.
Q5 Why are some torque specs listed in 'Nm' and others in 'ft-lbs'?
Why are some torque specs listed in 'Nm' and others in 'ft-lbs'?
Torque specifications are often listed in both Newton-meters (Nm) and foot-pounds (ft-lbs) because they are different units of measurement. Typically, European car manufacturers like Audi use Nm as their primary unit, while ft-lbs is more common in North America. You must ensure your torque wrench is set to the correct measurement unit to prevent incorrect torque values.
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
Torque Wrench (1/2" Drive)
A 1/2" drive torque wrench capable of measuring torque in Newton-meters (Nm) or foot-pounds (ft-lbs), covering the range of torque specifications for the 4.2L engine.
- Accurate torque measurement
- Ratchet mechanism for ease of use
- Click-type or digital display
Torque Wrench (3/8" Drive)
A 3/8" drive torque wrench, suitable for smaller fasteners requiring less torque. It should also measure in Nm or ft-lbs.
- Accurate torque measurement
- Compact size for access
- Click-type or digital display
Socket Set (Metric)
A comprehensive metric socket set, including various sizes and depths, essential for accessing the different fasteners on the 4.2L engine.
- Standard and deep sockets
- Variety of sizes (e.g., 6mm-24mm)
- Durable construction
Extension Bars (Various Lengths)
Various length extension bars for accessing hard-to-reach bolts and nuts on the 4.2L engine.
- Multiple lengths for versatility
- Secure locking mechanism
- Durable construction
Universal Joint
A universal joint to allow for socket and wrench operation at an angle, useful for fasteners in difficult positions.
- Allows for angled access
- Durable construction
- Secure connection
Torx Socket Set
A set of Torx sockets for fasteners requiring a Torx interface. Often used for engine components.
- Variety of Torx sizes
- Durable construction
- Secure fit
Service Procedures
Intake Manifold Installation
Procedure for installing the intake manifold onto the 4.2L engine, ensuring proper torque on all fasteners. Follow the sequence diagram as well.
- Clean the intake manifold and mating surfaces on the cylinder heads.
- Position the intake manifold gasket on the heads.
- Carefully lower the intake manifold onto the cylinder heads.
- Install the intake manifold bolts by hand.
- Torque the bolts in a star-pattern sequence, starting from the center bolts outwards. Use the manufacturer torque specification, usually about 20 NM
- Recheck torque after initial torquing process.
- Connect all vacuum lines and sensors associated with the intake manifold.
Valve Cover Installation
Procedure for installing valve covers on the 4.2L engine, ensuring proper torque on all fasteners to prevent leaks. Follow the manufacturer torque sequence diagram.
- Clean the valve cover and cylinder head mating surfaces.
- Position the valve cover gasket on the cylinder head.
- Carefully place the valve cover onto the head.
- Install the valve cover bolts by hand.
- Torque the bolts in a star-pattern sequence, starting from the center bolts outwards. Use the manufacturer torque specification, usually 10NM.
- Recheck torque after initial torquing process.
- Ensure breather hoses are properly attached.
Crankshaft Pulley Installation
Procedure for installing the crankshaft pulley on the 4.2L engine, ensuring proper torque on the center bolt.
- Clean the crankshaft snout and the mating surface of the pulley.
- Position the crankshaft pulley onto the crankshaft.
- Install the crankshaft bolt by hand, making sure it threads smoothly.
- Torque the crankshaft bolt to the specified torque, which is usually 150 Nm + 180 degrees.
- Verify the pulley is seated properly after torquing.
- Install all associated accessories.
Camshaft Bearing Cap Installation
Procedure for correctly installing the camshaft bearing caps, paying careful attention to the orientation and torque sequence
- Ensure all bearing surfaces are clean
- Position the bearing caps in the correct orientation
- Install the bolts by hand.
- Torque the bearing cap bolts to the manufacturer specification in the correct sequence usually in steps, typically around 10Nm.
- Recheck torque and ensure all bearings are secure
- Check camshaft rotation after installation.
Technical Service Bulletins
Oil Leak at Valve Cover Gaskets
2012-05-15Some 2007-2012 Audi S5 vehicles with the 4.2L engine have reported oil leaks at the valve cover gaskets, often due to improper torque or gasket material breakdown.
Resolution: Inspect the valve cover gasket and mating surfaces for damage. Ensure correct torque sequence and torque specification (typically 10 Nm) is used when reinstalling. Replace gaskets if needed. Consider using new bolts.
Intake Manifold Gasket Leak Issues
2014-08-22Reports indicate intake manifold gasket leaks can occur on 2010-2016 models, especially after engine work is done. Incorrect torque can lead to vacuum leaks and misfires.
Resolution: Inspect the intake manifold gasket for damage or deformation. Properly clean and prepare the surfaces and reassemble the intake manifold, torquing the bolts in the proper sequence and to the correct specification (approximately 20 Nm). Vacuum leak testing should be performed after reassembly.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- 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.