Acura Integra 1985-1989 Fuel System Bolt Torque Specifications & Line Fittings
Acura Integra 1985-1989

Acura Integra 1985-1989 Fuel System Bolt Torque Specifications

Detailed torque specifications for fuel system bolts on the 1985-1989 Acura Integra, including fuel rail, fuel pump, and fuel filter 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

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Fuel Rail System

The fuel rail system delivers fuel to the injectors and ensures proper fuel pressure. Components include the fuel rail, injectors, and associated mounting hardware.

1

Fuel Rail Bolts

M8 x 1.25
Torque Value
14.5 ft-lbs (20 N·m)
Important Notes
Torque value is the midpoint of the provided range (13-16 ft-lbs).
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque value is the midpoint of the provided range (7-9 ft-lbs).

Fuel Pump And Tank System

The fuel pump and tank system includes components that store and deliver fuel from the tank to the engine. Components include the fuel pump, tank straps, and sender unit.

1

Fuel Pump Mounting Bolts

M10 x 1.5
Torque Value
19.5 ft-lbs (26.5 N·m)
Important Notes
Torque value is the midpoint of the provided range (16-23 ft-lbs).
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Value
19.5 ft-lbs (26.5 N·m)
Important Notes
Torque value is the midpoint of the provided range (16-23 ft-lbs).
3

Fuel Tank Sender Unit Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque value is estimated based on similar M6 bolts.

Fuel Delivery System

The fuel delivery system includes components that transport fuel from the tank to the engine. Components include the fuel filter, filler neck, and fuel line fittings.

1

Fuel Filter Bolt/Nut

M12 x 1.5
Torque Value
25.5 ft-lbs (34.5 N·m)
Important Notes
Torque value is the midpoint of the provided range (22-29 ft-lbs).
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque value is the midpoint of the provided range (7-9 ft-lbs).
3

Fuel Line Fittings

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Torque value is the midpoint of the provided range (18-22 ft-lbs).

Emissions Control System

The emissions control system includes components that manage fuel vapors and emissions. Components include the fuel vapor canister and pressure regulator.

1

Fuel Vapor Canister Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque value is estimated based on similar M6 bolts.
2

Fuel Pressure Regulator Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque value is estimated based on similar M6 bolts.

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 it important to use the correct torque specification for fuel system bolts?

Using the correct torque specification is crucial for preventing fuel leaks, which can lead to fire hazards and engine damage. Under-torquing can result in a loose connection that vibrates free over time, while over-torquing can damage the bolt, gasket, or the threaded holes of the components, leading to leaks or component failure. For example, over-tightening fuel rail bolts can crush the fuel injector o-rings causing leaks.

Q2

What happens if I overtighten a fuel line banjo bolt?

Overtightening a fuel line banjo bolt can crush the sealing crush washers, leading to fuel leaks. It can also potentially damage the banjo fitting or the bolt itself, necessitating replacement. Imagine a scenario where you overtighten a banjo bolt on the fuel filter; you might notice fuel seepage immediately or experience it later. Always replace the crush washers with new ones.

Q3

Can I reuse the crush washers on my fuel system?

No, it is strongly recommended to replace crush washers every time you disconnect fuel line fittings. These washers are designed to compress and form a seal; once crushed, they cannot reliably provide a good seal again. Reusing them is a common cause of leaks. Picture re-installing your fuel pressure regulator without replacing its crush washers, the chances of a future leak increase significantly.

Q4

Where can I find the specific torque specifications for my 1985-1989 Acura Integra fuel system bolts if I don't have a service manual?

While a service manual is the best source, online forums and resources dedicated to 1st generation Acura Integras may provide some guidance. However, always cross-reference information and use caution. A Chiltons or Haynes repair manual for your specific year of Integra is a reliable source.

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

A calibrated torque wrench is essential for achieving the correct tightening force on fuel system bolts.

  • Accurate torque readings
  • Adjustable torque settings
Learn more

Socket Set (Metric)

A set of metric sockets is necessary to fit the various bolt head sizes on the fuel system.

  • Various sizes
  • 6-point sockets recommended
Learn more

Extension Bars

Extension bars will help reach fasteners that may be difficult to access directly with a torque wrench.

  • Varying lengths
  • Sturdy construction
Learn more

Wrench

Standard wrenches can be used to hold components in place while torquing a fastener.

  • Various sizes
  • Open or boxed ends
Learn more
Service Procedures

Fuel Rail Bolt Torque Procedure

This procedure outlines how to properly torque the fuel rail mounting bolts.

  • Locate the fuel rail mounting bolts.
  • Consult the torque specification for the specific bolt (typically 8-12 ft-lbs).
  • Using a calibrated torque wrench and the correct sized socket, tighten each bolt to half the specified torque in a criss-cross pattern.
  • Tighten each bolt to the full specified torque in the same criss-cross pattern.
  • Recheck the torque after running the engine for a brief period.
View full procedure

Fuel Injector Hold-Down Bolt Torque Procedure

This procedure outlines the correct torque for fuel injector hold-down bolts or clips.

  • Locate the fuel injector hold-down bolts or clips.
  • Consult the torque specification for the specific fastener (typically 5-7 ft-lbs).
  • Using a calibrated torque wrench and the correct size socket, carefully tighten each bolt/clip to the specified torque.
  • Ensure proper seating of the injectors while torquing.
  • Do not overtighten, as this can damage the injector or o-rings.
View full procedure

Fuel Filter Mounting Bolt Torque Procedure

This procedure details the proper torque for fuel filter mounting hardware.

  • Locate the fuel filter mounting bolts.
  • Consult the torque specification for the specific bolt (typically 15-20 ft-lbs).
  • Using a calibrated torque wrench and the correct socket, tighten the mounting bolts to the specified torque.
  • Ensure the filter is properly seated before tightening to the final torque.
View full procedure
Technical Service Bulletins

Fuel Leakage From Overtightened Fuel Rail Bolts

1987-06-15

Some 1985-1987 Integra models have experienced fuel leaks due to overtightening of fuel rail bolts, causing damage to the fuel rail or o-rings.

1985-1987

Resolution: Inspect the fuel rail for cracks or damage, replace o-rings as necessary, and torque fuel rail bolts to the specified torque using a calibrated torque wrench. It is important not to overtighten.

Fuel Injector Hold-Down Clip Breakage

1988-03-20

Fuel injector hold-down clips on 1988-1989 models are prone to breakage if overtightened or tightened unevenly. Use the proper torque and ensure the injector is seated correctly before torquing.

1988-1989

Resolution: Replace any damaged or broken fuel injector clips. When installing, ensure the injector is properly seated and torque the clip to the specified torque (5-7 ft-lbs). Avoid excessive force.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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