Acura MDX 2014-2020 Drivetrain Bolt Torque Specifications & Fastener Values
Acura MDX 2014-2020

Acura MDX 2014-2020 Drivetrain Bolt Torque Specifications

Detailed torque specifications for all drivetrain-related bolts on the 2014-2020 Acura MDX, including transmission, differential, driveshaft, and axle 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

Drivetrain Flywheel

Torque specifications for the flywheel and related components.

1

Flywheel Bolts

M12 x 1.25
Torque Value
69 ft-lbs (94 N·m)
Important Notes
Tighten in a star pattern. Use new bolts if required by the service manual. Ensure flywheel mating surfaces are clean and free of debris. Confirm bolt size before tightening.

Drivetrain Transmission

Torque specifications for the transmission and related components.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Ensure transmission is properly aligned before tightening. Confirm bolt size and use new bolts if recommended. Tighten bolts evenly to avoid stressing the transmission housing. Confirm bolt size before tightening.
2

Transmission Bellhousing Bolts (to engine)

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Tighten bolts evenly to the specified torque to ensure the bellhousing is securely attached to the engine block, use new bolts if recommended. Estimated value, check specific manual.
3

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8.7 ft-lbs (12 N·m)
Important Notes
Tighten in a criss-cross pattern to avoid warping the oil pan. Ensure the mating surface is clean and use a new gasket if needed. Confirm bolt size before tightening.
4

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Use a new sealing washer if required. Do not over-tighten these plugs as it can damage the transmission case. Confirm plug size and thread before tightening.
5

Output Flange Bolts (Transmission)

M10 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Tighten bolts evenly. Torque spec can vary significantly depending on the manufacturer. Estimated value, check specific manual.

Drivetrain Axles

Torque specifications for the drive axles, CV joints and related components.

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Ensure correct alignment of the axle before tightening. Confirm bolt size and thread before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
181 ft-lbs (245 N·m)
Important Notes
Use a new nut if required. This nut is critical for correct bearing preload. Confirm nut size and thread before tightening. Ensure proper alignment of components before tightening.

Drivetrain Driveshaft

Torque specifications for the propeller/drive shaft and related components.

1

Propeller/Drive Shaft Bolts

M10 x 1.25
Torque Value
47 ft-lbs (64 N·m)
Important Notes
Ensure correct alignment of the shaft before tightening. Confirm bolt size and thread before tightening. Tighten bolts evenly.

Drivetrain Differential

Torque specifications for the differential and related components.

1

Differential Mounting Bolts

M12 x 1.75
Torque Value
69 ft-lbs (94 N·m)
Important Notes
Ensure the differential is properly aligned before tightening. Estimated value, confirm with specific manual.
2

Differential Drain/Fill Plug

M18 x 1.5
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Use a new sealing washer if required. Do not over-tighten these plugs as it can damage the differential case. Confirm plug size and thread before tightening.
3

Rear Differential Input Flange Nut

M22 x 1.5
Torque Value
125 ft-lbs (170 N·m)
Important Notes
This nut is critical for setting proper bearing preload. Torque spec can vary significantly depending on the manufacturer, estimated value, check specific manual.
4

Output Flange Bolts (Differential)

M10 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Tighten bolts evenly. Torque spec can vary significantly depending on the manufacturer. Estimated value, check specific manual.

Drivetrain Transfercase

Torque specifications for the transfer case and related components.

1

Transfer Case Drain/Fill Plug

M18 x 1.5
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Use a new sealing washer if required. Do not over-tighten these plugs as it can damage the transfer case. Confirm plug size and thread 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

Why is it important to use the correct torque specifications?

Using the correct torque specifications for drivetrain bolts is crucial for proper component clamping force and joint integrity. Under-torquing can lead to loosening, vibration, and potential component failure, while over-torquing can damage threads, stretch bolts, or distort parts, both leading to potential part failure. Accurate torque ensures optimal performance, safety, and longevity of the drivetrain system.

Q2

What type of torque wrench should I use?

A calibrated click-type torque wrench is recommended for most drivetrain bolt applications. Beam-type torque wrenches can also be used but require more precise reading. Digital torque wrenches provide the most accuracy but may be more expensive. Ensure your torque wrench is within its calibration range for the required torque value.

Q3

Should I replace bolts after removing them?

While not always mandatory, it's highly recommended to replace torque-to-yield bolts (TTY). These are designed to stretch upon tightening and shouldn't be reused. Some specific driveline bolts, like those on the driveshaft or differential, are often recommended to be replaced, refer to the service manual for your specific situation. Even standard bolts should be checked for damage or stretching before reuse. If in doubt, replace them.

Q4

What do I do if I accidentally over-torque a bolt?

If you over-torque a bolt, it's essential to address it immediately. Loosen the bolt entirely, check the bolt and the threaded hole for damage (stretch, deformation, or stripped threads). If either is damaged, replace it. Even if visually ok, an over torqued bolt is compromised and should be replaced. Re-torque to specification. Consult a service manual or a trained mechanic if unsure.

Q5

Do I need any special tools for working on the Acura MDX drivetrain?

Besides a torque wrench, you may need specialized sockets, extensions, and potentially a fluid pump. Depending on the component you are working with, a jack, jack stands, or a vehicle lift may also be required to properly and safely access the components. A service manual for your specific year MDX is essential for identifying necessary tools and processes.

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 inch drive)

A calibrated torque wrench is essential for applying precise torque to drivetrain bolts.

  • Wide torque range (e.g., 20-150 ft-lbs)
  • Click-type mechanism for accurate torque application
  • Durable construction
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench for lower torque applications and accessing tighter spaces.

  • Lower torque range (e.g., 5-80 ft-lbs)
  • Click-type mechanism
  • Compact size
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit the various bolt heads used in the drivetrain.

  • Various sizes covering 8mm to 24mm
  • 6-point sockets for better grip
  • Impact-rated sockets recommended
Learn more

Extension Bars

Extension bars of various lengths aid in reaching recessed bolts and nuts.

  • Various lengths (3,6,10 inches)
  • Durable construction
  • 1/2 and 3/8 inch drive options
Learn more

Universal Joint

A universal joint allows you to apply torque at an angle when obstructions are present.

  • 1/2 and 3/8 inch drive options
  • High tensile strength
  • Smooth movement
Learn more
Service Procedures

Rear Differential Fluid Change

Procedure for changing the fluid in the rear differential, including proper torque specifications for fill and drain plugs.

  • Locate the fill and drain plugs on the rear differential.
  • Position a drain pan under the drain plug.
  • Remove the drain plug and allow fluid to drain completely.
  • Reinstall the drain plug with a new crush washer and torque to 35 ft-lbs.
  • Remove the fill plug.
  • Fill with new differential fluid until it reaches the fill hole.
  • Reinstall the fill plug with a new crush washer and torque to 35 ft-lbs.
View full procedure

Driveshaft Removal and Installation

Procedure for removing and installing the driveshaft, focusing on correct bolt torques.

  • Mark the driveshaft and differential flange for alignment.
  • Remove the bolts securing the driveshaft at both ends.
  • Carefully remove the driveshaft.
  • Install the driveshaft, aligning the marks.
  • Install new bolts and torque the rear driveshaft bolts to 49 ft-lbs.
  • Install new bolts and torque the front driveshaft bolts to 49 ft-lbs.
View full procedure

Transfer Case Fluid Change

Procedure for changing the fluid in the transfer case, including proper torque specifications.

  • Locate the fill and drain plugs on the transfer case.
  • Position a drain pan under the drain plug.
  • Remove the drain plug and allow fluid to drain completely.
  • Reinstall the drain plug with a new crush washer and torque to 33 ft-lbs.
  • Remove the fill plug.
  • Fill with new transfer case fluid until it reaches the fill hole.
  • Reinstall the fill plug with a new crush washer and torque to 33 ft-lbs.
View full procedure
Technical Service Bulletins

Rear Differential Whine Noise

2017-05-15

Some 2014-2016 MDX models may exhibit a whine noise from the rear differential.

2014-2016

Resolution: Inspect the rear differential fluid for contamination. Replace the fluid with the updated Honda DPSF-II fluid. Ensure all bolts are torqued to specifications.

Vibration During Acceleration

2018-11-20

Some 2017-2018 MDX models may have a vibration issue during acceleration that could be due to improper driveshaft torque.

2017-2018

Resolution: Inspect the driveshaft bolts for proper torque. Reinstall driveshaft ensuring proper alignment. Retorque bolts to 49 ft-lbs.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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