Audi Audi RS5 2010-2016 4.2L Engine Bolt Torque Specifications & Fastener Values
Audi Audi RS5 2010-2016

Audi Audi RS5 2010-2016 4.2L Engine Bolt Torque Specifications

Comprehensive list of bolt torque specifications for the 4.2L V8 engine found in the 2010-2016 Audi RS5. Includes torque values for various engine components such as cylinder head, connecting rods, main bearing caps, and more.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Cylinder Head

Torque specifications for fasteners related to the cylinder head, including head bolts and camshaft bearing cap bolts. Proper torque is critical for maintaining combustion chamber seal and proper camshaft alignment.

1

Cylinder Head Bolts (Main)

M12 x 1.5 (estimated)
Important Notes
Estimated bolt size. Torque-to-yield bolts, replace after removal. Tighten in a cross pattern. Multiple angle tightening steps are required.
2

Cylinder Head Bolts (Camshaft Bearing Cap)

M8 x 1.25 (estimated)
Important Notes
Estimated bolt size. Tighten in a staged, cross pattern. Multiple angle tightening steps are required.

Engine Block

Torque specifications for components attached to the engine block, including main bearing caps, connecting rods and engine mounts. Correct torque is crucial for the crankshaft and connecting rods to rotate properly, and to support the engine.

1

Main Bearing Cap Bolts (Inner)

M12 x 1.5 (estimated)
Important Notes
Estimated bolt size. Torque-to-yield bolts, replace after removal. Tighten in sequence with multiple steps and a final angle tightening.
2

Main Bearing Cap Bolts (Outer)

M8 x 1.25 (estimated)
Important Notes
Estimated bolt size. Tighten in sequence with multiple steps and a final angle tightening.
3

Connecting Rod Bolts

M9 x 1.0 (estimated)
Important Notes
Estimated bolt size. Torque-to-yield bolts, replace after removal. Tighten in a staged cross pattern.
4

Engine Mount Bolts (Engine to Mount)

M12 x 1.75 (estimated)
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated bolt size. Tighten in a staged cross pattern.
5

Engine Mount Bolts (Mount to Frame)

M10 x 1.5 (estimated)
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated bolt size. Tighten in a staged cross pattern.

Intake And Exhaust

Torque specifications for intake manifold and exhaust manifold, catalytic converter, and exhaust system clamps. Correct torque is crucial for preventing leaks and maintaining proper engine performance.

1

Intake Manifold Bolts

M8 x 1.25 (estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated bolt size. Tighten in a staged, cross pattern, starting from the center and working outwards.
2

Exhaust Manifold Bolts

M8 x 1.25 (estimated)
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Estimated bolt size. Tighten in a staged, cross pattern, starting from the center and working outwards.
3

Catalytic Converter to Exhaust Manifold Flange Bolts

M10 x 1.5 (estimated)
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated bolt size. Tighten bolts in a staged, cross pattern.
4

Exhaust System Clamp Bolts

M8 x 1.25 (estimated)
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Estimated bolt size. Tighten evenly to ensure secure and leak-free connection.

Timing Components

Torque specifications for components related to the engine's timing system, including camshaft sprockets and timing chain tensioners. Accurate torque application is crucial for maintaining proper valve timing and engine performance.

1

Camshaft Sprocket Bolts

M10 x 1.5 (estimated)
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Estimated bolt size. Tighten bolts evenly.
2

Timing Chain Tensioner Bolts

M6 x 1.0 (estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated bolt size. Tighten bolts evenly.

Other Components

Torque specifications for other various engine components, including oil pan, oil pump, water pump, crankshaft pulley, and flywheel/flexplate. Correct torque application is crucial for the function and integrity of these components.

1

Oil Pan Bolts

M6 x 1.0 (estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated bolt size. Tighten in a staged, cross pattern to ensure even gasket compression. Avoid over-tightening.
2

Oil Pump Bolts

M8 x 1.25 (estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated bolt size. Tighten bolts evenly.
3

Water Pump Bolts

M6 x 1.0 (estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated bolt size. Tighten in a staged, cross pattern to ensure even gasket compression.
4

Crankshaft Pulley Bolt

M18 x 2.0 (estimated)
Important Notes
Estimated bolt size. Torque-to-yield bolt, replace after removal. Final angle tightening is required.
5

Flywheel/Flexplate Bolts

M10 x 1.5 (estimated)
Important Notes
Estimated bolt size. Torque-to-yield bolts, replace after removal. Tighten in a star pattern, final angle tightening required.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

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

Stripped Fasteners

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

Overtightened Components

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

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

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

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

Torque Verification

Verify the torque applied to the fasteners

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

Thread Assessment

Assess the condition of the threads

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

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

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

Maintenance Tips

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

Tool Care

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

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

Why are accurate torque specifications crucial for the 4.2L V8 engine?

Accurate torque is crucial to ensure proper clamping force between components, preventing leaks, component failure, and potential engine damage. Over-torquing can strip threads or warp parts, while under-torquing can lead to loosening and leaks. For example, improperly torqued cylinder head bolts can cause coolant and oil leaks, leading to engine overheating and severe damage. This engine, being high-performance, requires exact tolerances.

Q2

Should I use new bolts when reassembling the 4.2L engine?

In many cases, yes. Certain bolts, such as cylinder head bolts and connecting rod bolts, are designed as torque-to-yield (TTY) or stretch bolts. They are meant to stretch upon installation and should *always* be replaced when removed. Reusing them can lead to improper clamping force and potential engine failure. Consult the factory service manual to know which bolts should be replaced. An example of a TTY bolt would be the cylinder head bolts, which stretch and need replacing for proper clamping.

Q3

How do I properly use a torque wrench when working on the 4.2L engine?

Always use a calibrated torque wrench. Start by setting the correct torque specification. Ensure the threads are clean and lubricated, as this can affect final torque. Tighten bolts in a specific pattern (usually specified in the service manual, such as a star pattern for cylinder heads) and in stages. If a spec calls for multiple passes of torque, complete each pass in that pattern. An example is tightening the intake manifold bolts in sequence to spread the clamping force evenly across the gasket, to prevent leaks.

Q4

Are there specific areas on the 4.2L that are particularly sensitive to over-torquing?

Yes, aluminum components on the 4.2L are particularly vulnerable to damage from over-torquing. This includes the intake manifold, valve covers, and oil pan. These parts can easily crack or strip threads with excessive force. Always use a properly calibrated torque wrench, consult the manufacturer's service manual for specific torque values, and tighten in the recommended pattern.

Q5

What if I don't have the factory specified torque wrench?

While a high-quality torque wrench is best, if unavailable, a properly calibrated torque wrench with an acceptable margin of error is necessary. Note that using a standard wrench without torque control can lead to inconsistent results and a higher chance of damaging components. Consider renting from a professional if an acceptable torque wrench is unavailable, or consider purchasing a good-quality torque wrench for the future. Avoid using a 'feel' approach, especially with a precision engine.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Torque Wrench (1/2-inch drive)

A calibrated torque wrench is essential for accurately tightening bolts to the specified values.

  • Wide torque range (e.g., 20-250 Nm)
  • Click-type or digital readout
  • Accurate calibration
Learn more

Torque Wrench (3/8-inch drive)

A smaller calibrated torque wrench for bolts with lower torque specifications.

  • Lower torque range (e.g., 5-80 Nm)
  • Click-type or digital readout
  • Accurate calibration
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit various bolt heads.

  • Variety of sizes
  • 6-point sockets for better grip
  • Deep and shallow sockets
Learn more

Extension Bars

Extension bars are needed to reach recessed bolts.

  • Variety of lengths
  • Durable construction
  • Secure attachment to sockets
Learn more

Universal Joint

A universal joint allows access to bolts at an angle.

  • Durable construction
  • Smooth rotation
  • Secure attachment
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Procedure for tightening cylinder head bolts on the 4.2L engine to ensure proper sealing and clamping force.

  • Clean all mating surfaces thoroughly.
  • Apply a thin coat of engine oil to bolt threads.
  • Install all cylinder head bolts hand-tight.
  • Tighten all bolts in sequence to 40 Nm.
  • Tighten all bolts in sequence to 70 Nm.
  • Tighten all bolts in sequence an additional 90 degrees.
  • Tighten all bolts in sequence an additional 90 degrees.
  • Confirm torque values.
View full procedure

Intake Manifold Bolt Tightening Procedure

Procedure for tightening intake manifold bolts to ensure proper sealing and airflow.

  • Clean all mating surfaces thoroughly.
  • Install all intake manifold bolts hand-tight.
  • Tighten all bolts in a criss-cross pattern to 10 Nm.
  • Confirm torque values.
View full procedure

Camshaft Bearing Cap Bolt Tightening Procedure

Procedure for tightening camshaft bearing cap bolts to secure the camshafts.

  • Clean all mating surfaces thoroughly.
  • Apply a thin coat of engine oil to bolt threads.
  • Install all bearing cap bolts hand-tight.
  • Tighten all bolts in sequence to 10 Nm.
  • Tighten all bolts in sequence an additional 90 degrees.
  • Confirm torque values.
View full procedure

Connecting Rod Bolt Tightening Procedure

Procedure for tightening connecting rod bolts to ensure proper crank and rod operation.

  • Clean all mating surfaces thoroughly.
  • Apply a thin coat of engine oil to bolt threads.
  • Install all connecting rod bolts hand-tight.
  • Tighten all bolts to 30 Nm.
  • Tighten all bolts an additional 90 degrees.
  • Confirm torque values.
View full procedure

Crankshaft Main Bearing Cap Bolt Tightening Procedure

Procedure for tightening crankshaft main bearing cap bolts to secure the crankshaft.

  • Clean all mating surfaces thoroughly.
  • Apply a thin coat of engine oil to bolt threads.
  • Install all main bearing cap bolts hand-tight.
  • Tighten all bolts to 65 Nm.
  • Tighten all bolts an additional 90 degrees.
  • Confirm torque values.
View full procedure
Technical Service Bulletins

Cylinder Head Bolt Re-Torque Recommendation

2013-05-15

Some 2010-2012 Audi RS5 4.2L engines may experience a slight decrease in cylinder head bolt torque over time, leading to potential gasket leaks. A re-torque procedure is recommended.

2010-2012

Resolution: Follow the specified cylinder head bolt tightening procedure outlined in the service procedures section, with an additional 15 degree final tightening angle after re-torque to 70nm and both 90 degree torque stages.

Revised Camshaft Bearing Cap Bolt Specifications

2014-11-20

Revised torque specification for camshaft bearing cap bolts to address some cases of over-tightening and potential damage to camshaft journals. New torque sequence is now required as well.

2010-2016

Resolution: Follow the revised camshaft bearing cap tightening procedure, replacing the 20nm first torque stage with the newly recommended 10nm first torque stage, maintaining all other stages and a new criss-cross tightening sequence.

Intake Manifold Gasket Leak Advisory

2015-03-01

Certain batches of intake manifold gaskets have been found to not seal correctly, causing manifold air leaks. Ensure proper torque application and consider using new gaskets when servicing.

2010-2016

Resolution: Always replace the intake manifold gaskets when removing or servicing the intake manifold. Follow the torque procedure for proper installation and sealing.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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