Audi Audi A3 2004-2013 2.0L Engine Bolt Torque Specifications & Fastener Values
Audi Audi A3 2004-2013

Audi Audi A3 2004-2013 2.0L Engine Bolt Torque Specifications

This page provides detailed torque specifications for various bolts on the 2.0L engine found in the 2004-2013 Audi A3, including cylinder head bolts, main bearing bolts, connecting rod bolts, and more. Proper torque application is critical for reliable engine operation.

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

2.0l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M10 x 1.5 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten in a specific sequence; refer to the vehicle's service manual for the correct pattern. Angle torque may be required after initial torque, consult the manual for the correct value. Bolt size is estimated.
2

Valve Cover Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly in a cross pattern. Bolt size is estimated.
3

Rocker Arms/Shafts Bolts

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.
4

Camshaft Sprocket Bolts

M10 x 1.5 (Estimated)
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Ensure proper alignment before tightening. Bolt size is estimated.
5

Camshaft Bearing Cap Bolts

M6 x 1.0 (Estimated)
Important Notes
Tighten in specific sequence, see manual, angle torque is required to properly seat bolts. Bolt size is estimated.

2.0l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.5 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Tighten in a specific sequence. Bolt size is estimated.
2

Oil Pan Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly in a cross pattern. Bolt size is estimated.
3

Oil Drain Plug Bolt

M14 x 1.5 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use a new sealing washer every time. Bolt size is estimated.
4

Oil Filter Housing Bolt

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper sealing surface is clean and the O-ring is in good condition. Bolt size is estimated.
5

Engine Mount Bolts to Engine Block

M12 x 1.75 (Estimated)
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Bolt size is estimated.

2.0l-engine Intake

Torque specifications for the intake manifold and related components.

1

Intake Manifold Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern. Bolt size is estimated.
2

Throttle Body Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.
3

EGR Valve Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.

2.0l-engine Exhaust

Torque specifications for the exhaust manifold and related components.

1

Exhaust Manifold/Headers Bolts

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly in a cross pattern. Bolt size is estimated.
2

Turbocharger Mounting Bolts to Manifold

M8 x 1.25 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Bolt size is estimated. For turbocharged engines only.
3

Turbo Oil Line Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Bolt size is estimated. For turbocharged engines only.

2.0l-engine Fuel

Torque specifications for fuel system components.

1

Fuel Rail Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.
2

Fuel Injector Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.

2.0l-engine Ignition

Torque specifications for the ignition system components.

1

Spark Plugs

M14 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use proper spark plug socket. Bolt size is estimated.
2

Ignition Coil Bolt

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.

2.0l-engine Timing

Torque specifications for timing system components.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure the tensioner is properly positioned. Bolt size is estimated.

2.0l-engine Cooling

Torque specifications for cooling system components.

1

Water Pump Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.
2

Water Pump Pulley Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.
3

Thermostat Housing Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.

2.0l-engine Accessories

Torque specifications for accessory drive system components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5 (Estimated)
Torque Value
110 ft-lbs (150 N·m)
Important Notes
Bolt size is estimated.
2

Serpentine/Accessory Drive Belt Tensioner Bolt

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the tensioner is properly positioned. Bolt size is estimated.
3

Drive Belt Idler Pulley Bolt

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the idler pulley is properly positioned. Bolt size is estimated.
4

Power Steering Pump Mounting Bolts

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.
5

Alternator Mounting Bolts

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.
6

A/C Compressor Mounting Bolts

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.

2.0l-engine Sensors

Torque specifications for engine sensors.

1

Crankshaft Position Sensor Bolt

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Bolt size is estimated.
2

Coolant Temperature Sensor Bolt

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Bolt size is estimated.
3

Knock Sensor Bolt

M8 x 1.25 (Estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Bolt size is estimated.

2.0l-engine Connecting Rods

Torque specifications for connecting rod nuts.

1

Connecting Rod Nuts

M8 x 1.0 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten evenly. Bolt size is estimated.

2.0l-engine Flywheel

Torque specifications for the flywheel.

1

Flywheel Bolts

M10 x 1.5 (Estimated)
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Tighten in a star pattern. Bolt size is estimated.

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 torque specifications important for engine bolts?

Correct torque ensures proper clamping force, preventing leaks, loosening, and component damage. Over-tightening can strip threads or warp parts, while under-tightening can lead to joint failure and leaks. For example, a cylinder head bolt torqued incorrectly could result in a blown head gasket.

Q2

What happens if I over-torque a bolt?

Over-torquing can stretch or break the bolt, strip threads in the engine block or component, and potentially damage the component being fastened. For instance, over-tightening the intake manifold bolts can crack the manifold and cause vacuum leaks.

Q3

Can I reuse torque-to-yield bolts?

Torque-to-yield (TTY) bolts, commonly used in cylinder heads, are designed to stretch upon tightening. They MUST NOT be reused. Using a TTY bolt a second time will not provide the necessary clamping force and could lead to engine damage. Always replace these bolts with new ones.

Q4

Do I need to use a torque wrench?

Yes, a torque wrench is essential for accurately tightening bolts to the specified torque. 'By feel' is highly unreliable and can lead to over- or under-torquing. Using a click-type torque wrench provides the most precise results.

Q5

Should I use threadlocker on engine bolts?

Use threadlocker only where the manufacturer specifies. Some bolts rely on precise torque and clean threads for proper clamping. Using threadlocker where not specified could introduce additional friction which will interfere with your torque values. Typically, exhaust manifold bolts do benefit from a high-temperature threadlocker to prevent them from backing out.

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" Drive)

A calibrated torque wrench is essential for accurately tightening bolts to specification. 1/2" drive is recommended for most engine fasteners.

  • Accurate torque measurement
  • Audible click when target torque is reached
Learn more

Torque Wrench (3/8" Drive)

A smaller 3/8" drive torque wrench is useful for smaller bolts and hard-to-reach areas.

  • Lower torque range
  • Better access to tight spaces
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit all the various bolt heads on the engine.

  • Variety of sizes
  • 6-point sockets for optimal grip
Learn more

Torx Socket Set

A set of Torx sockets (both external and internal) is necessary for specific engine components.

  • Various sizes (T- and E-)
  • Durable construction
Learn more

Extensions and Universal Joints

These help access bolts in hard to reach areas.

  • Extends socket reach
  • Allows access at angles
Learn more
Service Procedures

Cylinder Head Bolt Tightening

Proper tightening of cylinder head bolts is critical to maintaining head gasket seal. Always follow the manufacturer's sequence and torque specifications.

  • 1. Clean the threads of the bolts and the holes in the block.
  • 2. Apply a thin coat of engine oil to the bolt threads and under the bolt head.
  • 3. Install the cylinder head and position the bolts.
  • 4. Tighten all the bolts in the specified sequence to the first stage torque.
  • 5. Tighten all the bolts in the specified sequence to the second stage torque.
  • 6. Turn the bolts a final specified angle in the correct sequence.
View full procedure

Main Bearing Cap Bolt Tightening

Main bearing caps should be tightened in stages to properly clamp the crankshaft.

  • 1. Install the main bearing caps and position the bolts.
  • 2. Tighten all the bolts in the specified sequence to the first stage torque.
  • 3. Tighten all the bolts in the specified sequence to the second stage torque.
  • 4. Turn the bolts a final specified angle in the correct sequence.
View full procedure

Connecting Rod Bolt Tightening

Connecting rod bolts require precise torque to maintain the integrity of the rod and bearing interface.

  • 1. Clean the threads of the bolts and connecting rod cap.
  • 2. Apply a thin coat of engine oil to the bolt threads and under the bolt head.
  • 3. Install the connecting rod cap and position the bolts.
  • 4. Tighten all the bolts in the specified sequence to the first stage torque.
  • 5. Turn the bolts a final specified angle in the correct sequence.
View full procedure

Intake Manifold Bolt Tightening

Proper torque of intake manifold bolts prevents vacuum leaks.

  • 1. Position the intake manifold on the engine.
  • 2. Install the bolts.
  • 3. Tighten all bolts in the specified sequence to the correct torque.
View full procedure

Exhaust Manifold Bolt Tightening

Proper torque of exhaust manifold bolts prevents exhaust leaks.

  • 1. Position the exhaust manifold on the engine.
  • 2. Install the bolts.
  • 3. Tighten all bolts in the specified sequence to the correct torque.
View full procedure

Oil Pan Bolt Tightening

Proper torque of the oil pan bolts prevents leaks.

  • 1. Install the oil pan with a new gasket.
  • 2. Install the bolts.
  • 3. Tighten all bolts in the specified sequence to the correct torque.
View full procedure
Technical Service Bulletins

Excessive Oil Consumption on 2.0L TFSI Engines

2010-03-15

This bulletin addresses issues of excessive oil consumption on certain 2.0L TFSI engines due to piston ring issues. Improper torque during assembly can contribute to this issue.

2008-2011

Resolution: Inspection and replacement of piston rings and proper torque of components during reassembly.

Cylinder Head Bolt Stretch Issues on 2.0L Engines

2012-07-20

This bulletin highlights potential issues with cylinder head bolt stretch and possible engine damage due to improper torquing procedures. Using new bolts is critical.

2004-2013

Resolution: Always use new cylinder head bolts and follow torque-to-yield specifications exactly.

Oil Leak from Main Bearing Cap

2009-05-10

This bulletin highlights oil leaks stemming from improperly torqued main bearing caps. Use new bolts and proper torque procedures.

2006-2009

Resolution: Inspect main bearing caps and ensure proper bolt torque procedures are followed with new bolts.

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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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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