Acura CL 2001-2003 B7XA Transmission Transmission Torque Specifications & Bolt Torque Values
Acura CL 2001-2003

Acura CL 2001-2003 B7XA Transmission Torque Specifications

Detailed torque specifications for all bolts related to the B7XA automatic transmission in the 2001-2003 Acura CL. Includes bellhousing, pan, and other relevant bolt torque values.

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

B7xa-transmission Case

Torque specifications for the transmission case and related components.

1

Transmission Case Bolts (M8)

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Tighten in a criss-cross pattern to ensure even clamping pressure. Over-tightening can crack the case.
2

Transmission Case Bolts (M10)

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Estimated value. Tighten in a criss-cross pattern to ensure even clamping pressure. Over-tightening can crack the case.

B7xa-transmission Mounting

Torque specifications for mounting the transmission to the engine block.

1

Transmission Bell Housing Bolts to Engine Block

M12 x 1.75
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Tighten evenly in a cross pattern. Important to ensure the transmission is seated correctly to the engine block before torquing.
2

Transmission Mounting Bolts

M12 x 1.75
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Tighten evenly in a cross pattern. These bolts secure the transmission to the engine or subframe/frame, depending on the vehicle design.

B7xa-transmission External Components

Torque specifications for external components on the transmission.

1

Transmission Range Switch Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly in a cross pattern, do not over-torque as this may damage the transmission case.
2

Transmission Speed Sensor Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure the sensor is correctly seated before tightening. Do not over-torque.
3

Transmission Detent Plate Bolt/s

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly in a cross pattern. Ensure the shift linkage operates smoothly after installation.
4

Transmission Shift Solenoid Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly in a cross pattern. Do not over tighten.
5

Transmission Oil Cooler Line Bolts/Fittings (Standard)

M10 x 1.5
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Do not over-tighten, ensure there are no leaks after installation.
6

Transmission Oil Cooler Line Bolts/Fittings (Aluminum/Banjo)

M10 x 1.5
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Do not over-tighten. Aluminum fittings can be easily damaged. Ensure there are no leaks after installation.

B7xa-transmission Internal Components

Torque specifications for internal transmission components accessible through the oil pan.

1

Transmission Valve Body Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly in a cross pattern. Over-tightening can damage the valve body or transmission case.
2

Transmission Filter Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Do not over-tighten. Using a new filter with a new gasket is very important to prevent leaks.
3

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Tighten evenly in a cross pattern. Ensure the pan gasket is properly seated to prevent leaks.

B7xa-transmission Fluid And Axles

Torque specifications for transmission fluid plugs and axle components.

1

Transmission Fluid Drain/Fill Plug

M18 x 1.5
Torque Value
29 ft-lbs (39 N·m)
Important Notes
Ensure the plug's O-ring is in good condition. Do not over-tighten.
2

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the plug's O-ring is in good condition. Do not over-tighten.
3

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Tighten evenly in a cross pattern to ensure proper axle alignment and secure mounting. Do not over-torque.
4

CV Joint to Transmission Flange Bolts

M10 x 1.5
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Tighten evenly in a cross pattern. Make sure that the CV joint is properly seated against the transmission flange. Do not over-torque.

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 precise torque specifications important for the B7XA transmission?

Precise torque specifications are crucial to ensure proper clamping force between transmission components. Under-torquing can lead to leaks, loosening, and component failure, while over-torquing can damage threads, strip bolts, or distort housings, causing internal issues and potential catastrophic failure. The B7XA transmission, like all transmissions, is precisely engineered; deviating from torque specs compromises its integrity.

Q2

What happens if I over-torque a B7XA transmission bolt?

Over-torquing a B7XA transmission bolt can lead to several issues, including stretching or breaking the bolt itself, damaging the threads in the aluminum transmission housing, and potentially causing a crack or distortion in the mating surface. In extreme cases, an over-torqued bolt can put undue stress on the transmission housing, leading to fluid leaks or more severe internal damage down the line. You may feel resistance as you are torquing, or you may not even feel it before the damage occurs.

Q3

What if I don't have a torque wrench? Can I just tighten bolts 'by feel'?

While it might seem convenient, tightening B7XA transmission bolts 'by feel' is highly discouraged. 'By feel' is subjective and doesn't guarantee the necessary precision, increasing the risk of under- or over-tightening. A torque wrench is essential for accurately tightening the fasteners to the manufacturer's recommended specifications and is a necessary tool for this job. It's especially important given the aluminum construction of the B7XA which is more sensitive to improper torque.

Q4

Do I need to use new bolts when servicing the B7XA transmission?

While not always mandatory for all bolts, it's generally recommended to replace critical bolts (such as those connecting the transmission housing halves, especially the converter bolts) when servicing the B7XA transmission. These bolts can stretch and weaken after multiple cycles of being tightened, and reusing them might result in less reliable clamping force, which is often mistaken for bad gaskets. This can increase the chance of leaks or component failure and can save you on more work later on.

Q5

What type of threadlocker should be used with B7XA transmission bolts?

Generally, medium-strength (blue) threadlocker is recommended for B7XA transmission bolts if a threadlocker is specified in your repair manual. Using high-strength (red) threadlocker is usually not recommended for the B7XA transmission, as it can make disassembly difficult and can damage the aluminum threads. Always refer to the Acura service manual for specific recommendations on threadlocker usage.

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 applying specified torque values to transmission bolts.

  • 1/2 inch drive
  • Foot-pound (ft-lb) and Newton-meter (Nm) scales
  • Accurate calibration
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit various bolt head sizes on the B7XA transmission.

  • Various sizes: 10mm, 12mm, 14mm, 17mm, 19mm
  • 6-point sockets preferred for better grip
  • Deep sockets may be needed for recessed bolts
Learn more

Extension Bars

Extension bars of various lengths are required for accessing hard to reach bolts on the transmission.

  • Various length options: 3-inch, 6-inch, 10-inch
  • Secure locking mechanism
  • Durable construction
Learn more

Universal Joint (Swivel)

A universal joint adapter allows for torque application at an angle, essential for some bolts.

  • 1/2 inch drive
  • Smooth swivel action
  • Durable construction
Learn more
Service Procedures

B7XA Transmission Pan Bolt Torque Procedure

This procedure details the steps to properly torque the transmission pan bolts on a 2001-2003 Acura CL with a B7XA transmission.

  • Clean the mating surfaces of the transmission pan and transmission case.
  • Install the transmission pan with a new gasket.
  • Install all pan bolts finger-tight.
  • Using a torque wrench and the appropriate socket, tighten the pan bolts in a cross-pattern to 16 Nm (12 ft-lb).
  • Double-check the torque on all bolts to ensure they are all tightened to the specification.
View full procedure

B7XA Transmission Case Bolt Torque Procedure

This procedure details the steps to properly torque the transmission case bolts on a 2001-2003 Acura CL with a B7XA transmission.

  • Clean the mating surfaces of the transmission case.
  • Install the transmission case with a new gasket.
  • Install all case bolts finger-tight.
  • Using a torque wrench and the appropriate socket, tighten the case bolts in a cross-pattern to 20 Nm (15 ft-lb).
  • Double-check the torque on all bolts to ensure they are all tightened to the specification.
View full procedure

B7XA Transmission Mount Bolt Torque Procedure

This procedure details the steps to properly torque the transmission mount bolts on a 2001-2003 Acura CL with a B7XA transmission.

  • Clean the mounting surfaces of the transmission mount and body or subframe.
  • Position the transmission mount.
  • Install all mount bolts finger-tight.
  • Using a torque wrench and the appropriate socket, tighten the mount bolts to 70 Nm (52 ft-lb).
  • Double-check the torque on all bolts to ensure they are all tightened to the specification.
View full procedure
Technical Service Bulletins

Transmission Fluid Leakage from Pan

2004-03-15

Reports of transmission fluid leaks from the pan have been reported. These leaks are often caused by improper torque of the pan bolts or gasket damage.

2001-2003 Acura CL

Resolution: Ensure the transmission pan bolts are torqued to the specification of 16 Nm (12 ft-lb) in a cross-pattern. Use a new gasket when reinstalling the pan.

Premature Transmission Mount Failure

2005-06-20

Some reports of premature transmission mount failure have been documented which can be attributed to undertorquing of the mount bolts.

2001-2003 Acura CL

Resolution: Verify the transmission mount bolts are torqued to the specification of 70 Nm (52 ft-lb) upon reinstallation. Also inspect the mount for cracks or damage.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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