Acura Integra 1989-1993 MP7 Transmission Transmission Torque Specifications & Bolt Torque Values
Acura Integra 1989-1993

Acura Integra 1989-1993 MP7 Transmission Torque Specifications

Detailed torque specifications for all bolts related to the MP7 transmission found in 1989-1993 Acura Integra models. Includes case bolts, mounting bolts, and drain/fill plug torques.

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

Flywheel

The flywheel assembly connects the engine crankshaft to the transmission input shaft. Proper torque ensures secure attachment and prevents misalignment or damage.

1

Flywheel Bolts

M10 x 1.25
Torque Value
90 ft-lbs (122 N·m)
Important Notes
Torque in a star pattern to ensure even clamping force.

Transmission Mounting

The transmission mounting system secures the transmission to the chassis, reducing vibrations and preventing misalignment.

1

Transmission Mounting Bolts

M8 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Ensure the transmission is properly aligned before tightening.

Oil Pan

The transmission oil pan houses the transmission fluid and must be securely sealed to prevent leaks.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Torque in a crisscross pattern to ensure even sealing.

Drain Fill Plugs

The drain and fill plugs allow for the servicing of transmission fluid and must be properly torqued to prevent leaks.

1

Transmission Drain Plug

M14 x 1.5
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Use a new crush washer to ensure a proper seal.
2

Transmission Fill Plug

M14 x 1.5
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Use a new crush washer to ensure a proper seal.

Drive Axle

The drive axle and CV joint connect the transmission to the wheels, ensuring power transfer and smooth operation.

1

Drive Axle Bolts

M10 x 1.25
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Ensure the axle is fully seated before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
143 ft-lbs (194 N·m)
Important Notes
Use a new cotter pin after tightening.

Starter Motor

The starter motor is mounted to the transmission housing and must be securely attached for reliable engine cranking.

1

Starter Motor Mounting Bolts

M8 x 1.25
Torque Value
31 ft-lbs (42 N·m)
Important Notes
Ensure proper alignment with the transmission housing.

Bellhousing

The bellhousing connects the transmission to the engine block, ensuring proper alignment and sealing.

1

Bellhousing Bolts

M10 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Torque in a star pattern to ensure even clamping force.

Shift Linkage

The shift linkage connects the gear shifter to the transmission, enabling smooth and accurate gear changes.

1

Shift Linkage Bolts

M6 x 1.0
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Ensure the linkage is properly aligned before tightening.

Clutch

The clutch assembly connects the engine to the transmission, enabling smooth engagement and disengagement of power.

1

Clutch Pressure Plate Bolts

M8 x 1.25
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Torque in a star pattern to ensure even clamping force.

Crossmember

The transmission crossmember supports the transmission and must be securely attached to the chassis.

1

Transmission Crossmember Bolts

M10 x 1.25
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Ensure the crossmember is properly aligned before tightening.

Shift Shaft Seal

The shift shaft seal retainer prevents leaks and ensures smooth operation of the shift shaft.

1

Shift Shaft Seal Retainer Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure the seal is properly seated before tightening.

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

What happens if I overtighten the MP7 transmission bolts?

Overtightening can cause several issues. The bolts themselves can stretch or even break, which can require difficult and expensive removal. The transmission case can also crack or warp, compromising its structural integrity and potentially leading to leaks or transmission failure. For example, if the case bolts are overtightened, the case could crack over time, especially when exposed to heat cycles. It is crucial to adhere to the specified torque settings.

Q2

What happens if I undertighten the MP7 transmission bolts?

Undertightening can lead to loose components and leaks. For example, the bellhousing bolts if undertightened might allow the transmission to shift or vibrate excessively. This can also lead to fluid leakage as the seal between the transmission case and other components is not compressed sufficiently, and eventually leads to premature wear of other components due to vibration. Always use a calibrated torque wrench to achieve the correct torque specification.

Q3

Should I use threadlocker on the MP7 transmission bolts?

Generally, for the main case bolts and bellhousing bolts, threadlocker is not required on the MP7 transmission during normal maintenance unless explicitly mentioned in the service manual. However, for certain smaller bolts in the shift linkage mechanism or other accessory brackets, a medium-strength threadlocker (such as Loctite 242 or equivalent) may be advisable. Consult the service manual for specifics. Threadlocker can prevent bolts from loosening due to vibration over time. However, do not use threadlocker where it is not specified, as this can make future removal difficult.

Q4

Do I need to use new bolts each time I work on the MP7 transmission?

While not mandatory for all bolts, it's highly recommended to replace bolts that are known to stretch under high torque specifications or those with locking features. For bellhousing bolts, it is generally good practice to replace them after multiple uses, as they are critical to structural integrity. Consider replacing any bolts that show signs of wear or damage. New bolts will ensure proper clamping force and reduce the risk of issues due to fatigue or damage from previous installation/removal. Always check the official Acura service manual for specific recommendations.

Q5

Is it necessary to follow the torque sequence when tightening MP7 transmission bolts?

Yes, following the torque sequence is critical for even clamping pressure. Uneven tightening can warp the transmission case or create stress points. Typically, you would start from the center bolts and work outward in a criss-cross pattern. This ensures all mating surfaces are properly and evenly tightened against each other, preventing leaks and other potential issues. Failing to do so can cause misalignment and structural damage over time.

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 accurately tightening bolts to the specified torque value.

  • 1/2 inch drive
  • Torque range of 10-100 ft-lbs
Learn more

Socket Set

A metric socket set is needed to fit the various sizes of bolts on the MP7 transmission.

  • Metric sizes ranging from 8mm to 17mm
  • Includes deep sockets for hard to reach bolts
Learn more

Extension Bars

Extension bars assist in reaching recessed or difficult to access bolts.

  • 3 inch, 6 inch and 10 inch lengths
  • 1/2 inch drive
Learn more

Universal Joint

A universal joint allows the socket to reach bolts at an angle.

  • 1/2 inch drive
  • Swivel head
Learn more
Service Procedures

MP7 Transmission Case Bolt Torque Procedure

This procedure details the correct method for tightening the bolts holding the MP7 transmission case together.

  • 1. Locate all transmission case bolts. These are typically found around the perimeter of the transmission housing.
  • 2. Using a socket of the appropriate size, attach it to your torque wrench.
  • 3. Set the torque wrench to 33 ft-lbs (44 Nm).
  • 4. Starting with the bolts in a criss-cross pattern, tighten each to 33 ft-lbs. Use care not to over tighten.
  • 5. Verify each bolt is correctly torqued using the torque wrench.
  • 6. Double check the torque on all bolts after a short test drive.
View full procedure

MP7 Transmission Mount Bolt Torque Procedure

This procedure outlines the proper method for tightening the transmission mount bolts on an MP7 transmission.

  • 1. Locate the transmission mount bolts. These typically secure the mount to both the transmission and the vehicle chassis.
  • 2. Using a socket of the appropriate size, attach it to your torque wrench.
  • 3. Set the torque wrench to 47 ft-lbs (63 Nm).
  • 4. Tighten each transmission mount bolt to 47 ft-lbs. Ensure even pressure is applied.
  • 5. Verify each bolt is correctly torqued using the torque wrench.
  • 6. Double check the torque on all bolts after a short test drive.
View full procedure
Technical Service Bulletins

MP7 Transmission Case Bolt Loosening Issue

1994-03-15

Some 1989-1993 Integra models have experienced issues with transmission case bolts loosening over time, leading to leaks and potential transmission damage. This bulletin details the cause and resolution.

1989-1993 Acura Integra

Resolution: Inspect transmission case bolts for proper torque (33 ft-lbs). Apply a small amount of thread-locking compound to all case bolts and torque to specification. Monitor for leaks and re-torque after a short test drive if needed.

Transmission Mount Bolt Torque Degradation

1995-07-20

This bulletin addresses reports of transmission mount bolts losing torque, leading to excessive vibration and potential engine/transmission movement. Check mount bolts and retorque to factory specifications.

1989-1993 Acura Integra

Resolution: Inspect transmission mount bolts for proper torque (47 ft-lbs). Replace any stretched or damaged bolts. Apply a small amount of thread-locking compound. After torque application, conduct a short test drive. Verify torque of bolts.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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