Audi Audi A3 2013-2020 1.8L Engine Bolt Torque Specifications & Fastener Values
Audi Audi A3 2013-2020

Audi Audi A3 2013-2020 1.8L Engine Bolt Torque Specifications

Detailed torque specifications for bolts used in the 1.8L engine of the 2013-2020 Audi A3. Includes cylinder head, crankshaft, connecting rod, and other key components.

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

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Torque Calculator

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1.8l-engine Cylinder Head

Torque specifications for the cylinder head and related components.

1

Cylinder Head Bolts

M10 x 1.5 (Estimated)
Important Notes
Initial torque value. Always follow the manufacturer's specified tightening sequence and angle torque procedure. Additional angle tightening is required after the initial torque. Estimated bolt size. Always verify proper torque specs for your model/year.
2

Valve Cover Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten in a criss-cross pattern to ensure even pressure and prevent leaks. Estimated bolt size.
3

Camshaft Bearing Cap Bolts

M7 x 1.0 (Estimated)
Important Notes
Tighten in the specified sequence. An angle torque will be required in addition to initial torque. Estimated bolt size. Always verify proper torque specs for your model/year. Torque value may vary depending on the manufacturer and camshaft journal configuration.
4

Rocker Arms/Shafts Bolts

M8 x 1.25 (Estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure proper alignment of rocker arms or camshaft shafts before tightening. Estimated bolt size.
5

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten in a sequence starting from the center bolts outward. Ensures even pressure and avoids leaks.
6

Spark Plugs

M14 x 1.25 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Do not overtighten spark plugs to avoid damage. Estimated bolt size.

1.8l-engine Block

Torque specifications for engine block components.

1

Main Bearing Bolts

M10 x 1.5 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten in the specified sequence. Estimated bolt size.
2

Connecting Rod Nuts

M9 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Tighten evenly, in stages. Estimated bolt size.
3

Oil Pan Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten in a criss-cross pattern to prevent leaks. Estimated bolt size.
4

Oil Filter Housing Bolts

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure the oil filter housing is properly seated before tightening. Estimated bolt size.
5

Oil Drain Plug

M14 x 1.5 (Estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use a new crush washer and torque to spec. Estimated bolt size.
6

Crankshaft Position Sensor Mounting Bolts

M6 x 1.0 (Estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not overtighten; may damage the sensor. Estimated bolt size.
7

Knock Sensor

M8 x 1.25 (Estimated)
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure sensor is properly seated before tightening. Estimated bolt size.
8

Oil Pressure Sensor/Switch

M10 x 1.0 (Estimated)
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Do not overtighten; may damage the sensor. Estimated bolt size.

1.8l-engine Intake System

Torque specifications for intake system components.

1

Intake Manifold Bolts

M6 x 1.0 (Estimated)
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Tighten in a criss-cross pattern. Estimated bolt size.
2

Throttle Body Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the throttle body is properly seated. Estimated bolt size.
3

Intake Air Temperature (IAT) Sensor Bolt/Screw

M5 x 0.8 (Estimated)
Torque Value
3.5 ft-lbs (5 N·m)
Important Notes
Do not overtighten; may damage the sensor. Estimated bolt size.

1.8l-engine Fuel System

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
Ensure proper alignment of fuel rail. Estimated bolt size.
2

Fuel Injector Bolts

M5 x 0.8 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Tighten the bolts evenly and do not overtighten; may damage the fuel injectors. Estimated bolt size.
3

Fuel Injector Rail Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure proper alignment of fuel rail. Estimated bolt size.

1.8l-engine Cooling System

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
Ensure water pump is properly seated before tightening. Estimated bolt size.
2

Water Pump Pulley Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the pulley is correctly aligned. Estimated bolt size.
3

Thermostat Housing Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure a proper seal. Estimated bolt size.
4

Coolant Temperature Sensor

M10 x 1.0 (Estimated)
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Do not overtighten; may damage the sensor. Estimated bolt size.

1.8l-engine Timing System

Torque specifications for timing system components.

1

Timing Belt/Chain Tensioner Bolt

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tension on the timing belt or chain. Estimated bolt size.
2

Camshaft Sprocket Bolt

M10 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper timing is set. Estimated bolt size.
3

Variable Valve Timing (VVT) Solenoid Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure a proper seal. Estimated bolt size.

1.8l-engine Accessory Drive

Torque specifications for accessory drive components.

1

Crankshaft Pulley/Harmonic Balancer Bolt

M12 x 1.5 (Estimated)
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Ensure the pulley is properly seated. Estimated bolt size.
2

Serpentine/Accessory Drive Belt Tensioner Bolt

M10 x 1.5 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper belt tension. Estimated bolt size.
3

Drive Belt Idler Pulley Bolt

M10 x 1.5 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of idler pulley. Estimated bolt size.

1.8l-engine Electrical

Torque specifications for electrical system components.

1

Ignition Coil Bolt

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure proper electrical contact. Estimated bolt size.
2

Alternator Mounting Bolts

M10 x 1.5 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the alternator. Estimated bolt size.

1.8l-engine Ancillary Components

Torque specifications for various components.

1

A/C Compressor Mounting Bolts

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the A/C compressor. Estimated bolt size.
2

Power Steering Pump Mounting Bolts

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Ensure proper alignment of the power steering pump. Estimated bolt size.
3

Flywheel Bolts

M10 x 1.25 (Estimated)
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Ensure proper alignment of the flywheel. Use new bolts. Estimated bolt size.
4

EGR Valve Bolts

M6 x 1.0 (Estimated)
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure a proper seal. Estimated bolt size.

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 is using the correct torque specification important?

Using the correct torque ensures proper clamping force between components. Under-torquing can lead to leaks, loosening, and component damage due to movement. Over-torquing can cause bolt stretching, stripping threads, and component failure, potentially resulting in costly repairs or dangerous situations. For example, an over-torqued cylinder head bolt can distort the head and lead to gasket failure.

Q2

What type of torque wrench should I use?

A calibrated torque wrench is crucial. For most engine components, a click-type torque wrench is recommended, as they provide an audible and tactile indication when the desired torque is reached. Beam-type torque wrenches are also usable but can be harder to read accurately. Digital torque wrenches offer the best precision but are more expensive. Avoid using non-calibrated wrenches, or guessing the torque.

Q3

Do I need to use new bolts when reassembling?

For critical components like cylinder head bolts and connecting rod bolts, it's almost always recommended to use new bolts. These bolts are often torque-to-yield (TTY), meaning they stretch slightly during the tightening process, and they shouldn't be reused as they may not clamp properly after being stretched the first time. Reusing these bolts can result in engine damage or failure. For other components, inspect the original bolts for damage, and replace any that show wear. Always follow the repair manual recommendations.

Q4

What is 'torque-to-yield' (TTY) and how does it affect my torque procedure?

Torque-to-yield bolts are designed to stretch when tightened. They are typically tightened in multiple stages, often to a specified torque value, followed by a specific angle rotation. This process ensures that they stretch to the correct tension. You CANNOT reuse TTY bolts and MUST replace them. Ignoring the required angle rotation after the initial torque value could lead to improper clamping and subsequent damage. Ignoring this can result in engine failure.

Q5

What if I don't have the exact torque specification for my 1.8L Audi A3 component?

Never guess! If you are missing the specific torque specification, consult the official Audi repair manual (either paper copy or through a subscription service). Generic torque values should be avoided, as the specifications are engine and application specific. Using a wrong torque specification could result in serious damage or failure of the system. Do not use torque specifications from other engines or vehicles.

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 (1/4-inch drive)

Used for applying precise torque settings, typically for smaller bolts and fasteners.

  • Digital or click-type for accuracy
  • Range of 5-25 Nm
Learn more

Torque Wrench (3/8-inch drive)

Used for applying precise torque settings, typically for medium-sized bolts and fasteners.

  • Digital or click-type for accuracy
  • Range of 20-100 Nm
Learn more

Torque Wrench (1/2-inch drive)

Used for applying precise torque settings, typically for larger bolts and fasteners.

  • Digital or click-type for accuracy
  • Range of 40-200 Nm
Learn more

Socket Set (Metric)

Comprehensive set of metric sockets to fit various bolt head sizes.

  • Sizes ranging from 6mm to 19mm
  • Includes various depths (standard & deep)
  • 1/4, 3/8, and 1/2-inch drive options
Learn more

Extension Bars

Used to extend reach to fasteners in difficult to access locations.

  • Various lengths
  • 1/4, 3/8, and 1/2-inch drive options
Learn more

Universal Joint

Allows sockets to be used at an angle for access to hard to reach fasteners.

  • 1/4, 3/8, and 1/2-inch drive options
Learn more
Service Procedures

Cylinder Head Bolt Tightening Procedure

Procedure for tightening the cylinder head bolts on the 1.8L engine, including the correct torque sequence and values.

  • Clean all bolt threads and the mating surfaces of the cylinder head and engine block.
  • Install all cylinder head bolts by hand, ensuring they are seated correctly.
  • Torque all bolts in the specified sequence to the first stage torque using the 1/2-inch drive torque wrench
  • Angle tighten all bolts in the same specified sequence using a suitable angle meter/gauge.
  • Confirm all bolts are tightened to specifications.
  • Recheck after first initial run cycle
View full procedure

Intake Manifold Bolt Tightening Procedure

Procedure for tightening the intake manifold bolts on the 1.8L engine, including the correct torque sequence and values.

  • Clean all bolt threads and the mating surfaces of the intake manifold and cylinder head.
  • Install all intake manifold bolts by hand, ensuring they are seated correctly.
  • Torque all bolts in the specified sequence to the correct torque using the 3/8-inch drive torque wrench.
  • Confirm all bolts are tightened to specifications.
View full procedure

Exhaust Manifold Bolt Tightening Procedure

Procedure for tightening the exhaust manifold bolts on the 1.8L engine, including the correct torque sequence and values.

  • Clean all bolt threads and the mating surfaces of the exhaust manifold and cylinder head.
  • Install all exhaust manifold bolts by hand, ensuring they are seated correctly.
  • Torque all bolts in the specified sequence to the correct torque using the 3/8-inch drive torque wrench.
  • Confirm all bolts are tightened to specifications.
View full procedure

Oil Pan Bolt Tightening Procedure

Procedure for tightening the oil pan bolts on the 1.8L engine, including the correct torque sequence and values.

  • Clean all bolt threads and the mating surfaces of the oil pan and engine block.
  • Install all oil pan bolts by hand, ensuring they are seated correctly.
  • Torque all bolts in the specified sequence to the correct torque using the 1/4-inch drive torque wrench.
  • Confirm all bolts are tightened to specifications.
View full procedure

Timing Chain Tensioner Bolt Tightening Procedure

Procedure for tightening the timing chain tensioner bolts on the 1.8L engine, including the correct torque values.

  • Clean all bolt threads and the mating surfaces of the timing chain tensioner.
  • Install the timing chain tensioner bolts by hand, ensuring they are seated correctly.
  • Torque all bolts to the correct torque using the 1/4-inch drive torque wrench.
  • Confirm all bolts are tightened to specifications.
View full procedure
Technical Service Bulletins

Excessive Oil Consumption in 1.8L Engines

2017-05-15

Some 1.8L engines may experience excessive oil consumption due to piston ring issues. Check for excessive play and wear.

2013-2017

Resolution: Replace piston rings and check piston to cylinder bore clearance and tolerance.

Timing Chain Tensioner Failure

2018-11-01

Timing chain tensioner failure can cause rattling noise and potential engine damage. Inspection of tensioner is recommended at service intervals.

2013-2019

Resolution: Replace tensioner, chain and guides as a kit. Check the condition of sprocket teeth.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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