Audi Audi RS4 2018-present 2.9L Engine Bolt Torque Specifications
This page provides detailed torque specifications for various bolts on the 2.9L TFSI engine found in the 2018-Present Audi RS4 (B9) model. This includes cylinder head bolts, main bearing bolts, and other critical fasteners.
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 Block And Internals
Torque specifications for bolts related to the engine block, crankshaft, connecting rods, and oil pan.
1 Crankshaft Main Bearing Cap Bolts
M10
Crankshaft Main Bearing Cap Bolts
M10Important Notes
2 Connecting Rod Cap Bolts
M9
Connecting Rod Cap Bolts
M9Important Notes
3 Cylinder Head Bolts
M10
Cylinder Head Bolts
M10Important Notes
4 Oil Pan Bolts
M6
Oil Pan Bolts
M6Torque Value
Important Notes
5 Oil Pump Mounting Bolts
M6
Oil Pump Mounting Bolts
M6Torque Value
Important Notes
6 Flywheel Bolts
M12
Flywheel Bolts
M12Important Notes
Cylinder Head And Valvetrain
Torque specifications for bolts related to the cylinder head, camshafts, valve cover, and valvetrain components.
1 Camshaft Bearing Cap Bolts
M6
Camshaft Bearing Cap Bolts
M6Torque Value
Important Notes
2 Valve Cover Bolts
M6
Valve Cover Bolts
M6Torque Value
Important Notes
3 Variable Camshaft Timing Adjuster Bolts
M8
Variable Camshaft Timing Adjuster Bolts
M8Torque Value
Important Notes
4 Spark Plugs
M14 x 1.25
Spark Plugs
M14 x 1.25Torque Value
Important Notes
Intake And Exhaust System
Torque specifications for bolts related to the intake manifold, throttle body, exhaust manifold, and downpipe.
1 Intake Manifold Bolts
M6
Intake Manifold Bolts
M6Torque Value
Important Notes
2 Throttle Body Bolts
M6
Throttle Body Bolts
M6Torque Value
Important Notes
3 Exhaust Manifold/Turbocharger Bolts
M10
Exhaust Manifold/Turbocharger Bolts
M10Torque Value
Important Notes
4 Exhaust Downpipe/Cat Bolts
M10
Exhaust Downpipe/Cat Bolts
M10Torque Value
Important Notes
Cooling System
Torque specifications for bolts related to the water pump and thermostat housing.
1 Water Pump Bolts
M6
Water Pump Bolts
M6Torque Value
Important Notes
2 Thermostat Housing Bolts
M6
Thermostat Housing Bolts
M6Torque Value
Important Notes
Turbocharging System
Torque specifications for bolts related to the turbocharger oil and coolant lines and mounting.
1 Turbocharger Oil Line Bolts (Banjo Bolts)
M10
Turbocharger Oil Line Bolts (Banjo Bolts)
M10Torque Value
Important Notes
2 Turbocharger Coolant Line Bolts (Banjo Bolts)
M10
Turbocharger Coolant Line Bolts (Banjo Bolts)
M10Torque Value
Important Notes
3 Turbocharger Mounting Bolts
M10
Turbocharger Mounting Bolts
M10Torque Value
Important Notes
Other Critical Bolts
Torque specifications for engine mount and transmission bolts.
1 Engine Mount Bolts
M12
Engine Mount Bolts
M12Important Notes
2 Transmission to Engine Bolts
M12
Transmission to Engine Bolts
M12Important 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 What happens if I overtighten a bolt?
What happens if I overtighten a bolt?
Overtightening bolts on the 2.9L engine, especially those related to critical components like the cylinder head or crankshaft, can lead to bolt stretching, thread damage, or even component failure. This can result in costly repairs, oil leaks, or catastrophic engine damage. Always use a calibrated torque wrench and the correct specifications.
Q2 Can I reuse torque-to-yield (TTY) bolts?
Can I reuse torque-to-yield (TTY) bolts?
No. TTY bolts, commonly used in the 2.9L engine, are designed to stretch to a specific point when tightened. Reusing them can lead to improper clamping force, potentially causing leaks or component damage. They must be replaced with new ones during assembly to ensure proper function.
Q3 Why are some torque specs given with an angle?
Why are some torque specs given with an angle?
Torque plus angle (e.g., Nm + degrees) is often used for TTY bolts. The initial torque ensures consistent seating, and the angle applies the necessary stretch to achieve the required clamping force. A torque wrench alone is not enough and the specified angle must be applied after the initial torque using an angle gauge.
Q4 How often should I check torque on critical engine bolts?
How often should I check torque on critical engine bolts?
Unless explicitly specified by the manufacturer or after a major engine repair, regular torque checks of correctly installed bolts in the 2.9L engine are generally not necessary. Instead, focus on adhering to proper installation procedures, using new TTY bolts when required and torquing them correctly the first time, and then performing standard regular maintenance as outlined by Audi.
Q5 What tools do I need for torqueing engine bolts on the 2.9L?
What tools do I need for torqueing engine bolts on the 2.9L?
You will need a high-quality, calibrated torque wrench (preferably digital for accuracy) that covers the required torque ranges for the 2.9L engine. An angle gauge is essential for TTY bolts requiring angle tightening. You will also need the correct sockets and possibly extensions.
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 calibrated torque wrench capable of measuring torque values in Newton-meters (Nm) and foot-pounds (ft-lbs). Should have a range covering the torque specifications for the engine.
- Wide Torque Range
- Accurate Measurement
- Audible Click Mechanism
Torque Wrench (3/8" Drive)
A smaller calibrated torque wrench suitable for smaller bolts and limited access areas.
- Suitable for low torque values
- Compact design
- Accurate Measurement
Socket Set (Metric)
A complete set of metric sockets of various sizes to match the bolt heads on the 2.9L engine.
- Comprehensive Size Range
- Durable Construction
- 6-point sockets
Extension Bars (Various Lengths)
Extension bars in various lengths to allow access to recessed or hard-to-reach bolts.
- Different Length Options
- Durable Construction
- Secure Socket Connection
Universal Joint Adapter
A universal joint adapter to allow access to bolts at awkward angles.
- Flexible Angle Adjustments
- Durable Construction
- Secure Socket Connection
Torque Angle Meter
An angle meter for measuring torque angle when required by the torque specification.
- Precise Angle Measurement
- Easy To Read Display
- Durable construction
Service Procedures
Cylinder Head Bolt Tightening Procedure (2.9L)
Proper sequence and torque values for installing the cylinder head bolts. Requires specific multi-stage torque and angle procedure.
- Clean the cylinder head and engine block mating surfaces thoroughly.
- Install the cylinder head gasket ensuring correct alignment.
- Place the cylinder head onto the block.
- Install all new head bolts by hand, making sure they are tightened evenly.
- Follow the manufacturer's tightening sequence and torque values using a calibrated torque wrench.
- Apply the specified torque angle using a torque angle meter, if required.
Connecting Rod Bolt Tightening Procedure (2.9L)
Procedure for correctly tightening the connecting rod bolts, includes torque and angle settings.
- Clean all connecting rod mating surfaces.
- Install the connecting rod caps.
- Install new connecting rod bolts by hand, ensuring they are evenly snug.
- Tighten bolts to the initial torque spec using a calibrated torque wrench.
- Tighten bolts to the specified angle using a torque angle meter.
- Verify all fasteners are correctly installed and torqued.
Intake Manifold Bolt Tightening Procedure (2.9L)
Procedure for correctly tightening the intake manifold bolts. Requires specified torque values and tightening sequence.
- Install the intake manifold gasket, ensuring correct alignment.
- Install the intake manifold by hand, ensuring it's correctly seated.
- Install all bolts by hand, making sure they are tightened evenly.
- Tighten the bolts to the specified torque in the specified sequence using a calibrated torque wrench.
- Verify all fasteners are correctly installed and torqued.
Exhaust Manifold Bolt Tightening Procedure (2.9L)
Procedure for correctly tightening the exhaust manifold bolts. Requires specified torque values and tightening sequence.
- Install the exhaust manifold gasket, ensuring correct alignment.
- Install the exhaust manifold by hand, ensuring it's correctly seated.
- Install all bolts by hand, making sure they are tightened evenly.
- Tighten the bolts to the specified torque in the specified sequence using a calibrated torque wrench.
- Verify all fasteners are correctly installed and torqued.
Technical Service Bulletins
Engine Oil Leakage at Cylinder Head
2020-05-15Some 2018-2020 RS4 vehicles may exhibit oil leakage at the cylinder head due to improper torque of cylinder head bolts.
Resolution: Inspect cylinder head bolt torque. If outside of specification, remove and replace cylinder head bolts following the correct torque procedure using new bolts.
Connecting Rod Bolt Failure Risk
2021-11-22A batch of connecting rod bolts used in certain 2019-2021 vehicles may be prone to failure due to improper manufacturing. This could lead to engine damage.
Resolution: Inspect the connecting rod bolts and replace them with a new set if they are within the identified batch. Follow the correct torque specifications.
Intake Manifold Gasket Failure
2022-09-10Reports of intake manifold gasket failures due to improper bolt torque during assembly are surfacing. This issue has been identified primarily in 2020-2022 vehicles.
Resolution: Inspect the intake manifold gaskets. If failure is noticed, replace with new gaskets and apply correct torque specification for mounting bolts. Follow correct sequence.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- 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.