01-06 Transmission Whine (TW) Failure Thread Survey - Page 3 - Acura MDX Forum : Acura MDX SUV Forums
Register Home Forums Active Topics Auto Loans Photo Gallery Search Today's Posts Mark Forums Read Auto EscrowInsurance
MDXers.org is the premier Acura MDX Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Rate Thread
Old 11-16-2012, 06:52 PM   #31 (permalink)
Registered User
 
Join Date: Nov 2012
Posts: 1
2001
196,000 mi.
No whine!
ksmalk08 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-10-2013, 06:05 PM   #32 (permalink)
Registered User
 
Join Date: Dec 2012
Location: Cleveland, Ohio
Posts: 28
Gear noise - or a "whine" as you are describing - is NOT indicative of a transmission failure. Gear noise is prevalent in many different types of geared systems including automobile transmissions, photo copiers, etc. If you really want to hear some gear noise, put just about any vehicle in REVERSE, get it up to 10-20 mph and listen to the gear noise roar! Modulate the throttle so that you can change the engine speed and change the frequency of the noise.

Gear noise is created by the undulations on the gear teeth profiles as the gears mesh together - these undulations cause vibrations - the vibrations travel from the gear teeth, to the gear blank, to shafts, to bearings, to housings, etc. The gear blanks, shafts or the transmission housings act like speakers and radiate the sound.

Transmission Error is the term used to define the angular displacement of the driven gear (gear) relative to the driving gear (pinion). Perfect involute gear teeth produce zero transmission error at no load. Once load is applied though, the gear teeth bend and Transmission Error occurs and there are other things that create Transmission Error. There is lots and lots and lots of scientific data that correlate gear noise to Transmission Error.

The "undulations" on the gear teeth are on the micron level (1 micron = 0.00004 inches) and you cannot detect them with the human eye - special measurement equipment is used. Gear engineers modify the gear teeth profile from a perfect involute for several reasons in an attempt to minimize Transmission Error and gear noise.

However, they typically cannot eliminate all gear noise. Some companies are better than others. Some vehicles within a given company are better than others. Just because a company labels itself as the "luxury" arm of an auto company, that does not mean that they are great at everything that they implement. I have seen bad gear designs that just needed to be thrown out they were so noisy. While others, were close to being quiet, and just needed to be tweaked slightly.

Automobile companies are very sensitive to price too! So do not expect the auto companies to just fix a bad gear design and pass the cost onto the consumer. Plus, some companies just have "average" gear designers that do not even know how to improve a given gear design.


The gear whine frequency varies with engine speed with a given gear ratio and this is known as the mesh frequency. As an example, if the pinion shaft is rotating at 120 rpm, it has a rotation frequency of 2 Hz. If the pinion has 100 teeth, the mesh frquency is (2 Hz)*(100)=200 Hz. The meshing is not a pure sine wave, so the mesh frequency also creates harmonic frequencies at 400, 600, 800, 1000 Hz, etc.


Once you notice gear noise, it is typically difficult to tune it out, but again, it is not indicative of a failure.
mdx997 is offline   Reply With Quote Quick reply to this message
Old 01-11-2013, 11:17 AM   #33 (permalink)
Registered User
 
scorro1's Avatar
 
Join Date: Jan 2008
Location: Nuclear Power Plant, New York
Posts: 143
List model year: 03
Date/Mileage TW was first observed: 135k
Current mileage: 143k
Symptoms: Transmission began slipping. Transmission failed at 139k miles.
Did TW worsen over the above time periods? YES
Dealer response and/or corrective actions: Remanufactured transmission

Cost: $2500. Acura services covered the rest.
Mileage TW was addressed by Dealer: 139k
Did you contact your local Client Services (Owners.Acura.com)? Enter Case #. n/a
Current status of TW. Working Great after replacement.
__________________
2003 MDX Base Silver 142K Miles{
235/65R17 Bridgestone Dueler H/L Alenza,
2004+ Headlights with H9 Bulb Conversion,
Fog Lights equipped with 9012 Bulb Conversion
iPOD Aux hookup to Stock Radio,
Trunk Pet Net}

1991 Acura NSX Silver 31K Miles{
Escort 8500 X50,
K&N Intake
}

Last edited by scorro1; 01-11-2013 at 11:18 AM. Reason: spelling!
scorro1 is offline   Reply With Quote Quick reply to this message
Old 01-26-2014, 12:30 PM   #34 (permalink)
Registered User
 
Join Date: Jan 2014
Posts: 2
2006 MDX grinding during acceleration only

2006 MDX Touring /w Nav
grinding noise during acceleration only.
No noise during highway driving.
Noise noticed most when torque needed most.
Heard at speeds between 10-40 MPH.
146,000 miles when noticed first.
Brought to dealer who stated its normal noise for age of car.
Will call dealer if problem gets worse.
Could I expect some after warranty assistance with such high mileage if problem continues? I'd love to get some kind of discount given there transmission issues but is this laughable at this point? I mean really 146,000 miles and asking for a discount? I will of course try anything for a discount.
Otisburg is offline   Reply With Quote Quick reply to this message
Old 01-26-2014, 01:53 PM   #35 (permalink)
Registered User
 
Join Date: Dec 2012
Location: Cleveland, Ohio
Posts: 28
Quote:
Originally Posted by Otisburg View Post
2006 MDX Touring /w Nav
grinding noise during acceleration only.
No noise during highway driving.
Noise noticed most when torque needed most.
Heard at speeds between 10-40 MPH.
146,000 miles when noticed first.
Brought to dealer who stated its normal noise for age of car.
Will call dealer if problem gets worse.
Could I expect some after warranty assistance with such high mileage if problem continues? I'd love to get some kind of discount given there transmission issues but is this laughable at this point? I mean really 146,000 miles and asking for a discount? I will of course try anything for a discount.

I would not expect any assistance from Acura for an 8 year old car whether it is a known issue or not.
mdx997 is offline   Reply With Quote Quick reply to this message
Old 04-06-2014, 12:55 AM   #36 (permalink)
Registered User
 
Join Date: Feb 2012
Posts: 11
List model year: 2002

Date/Mileage TW was first observed: Jan 2009/83,000 miles

Current mileage: 157,000 miles

Symptoms: Loud whining which increased on turns at low speeds, thus when putting car in Reverse. Now there is a loud grinding when the car is put in Drive or Reverse.

Did TW worsen over the above time periods?: Always worsened. The transmission has been changed twice, once at 83,000 miles and once at 118,000 miles.

Dealer response and/or corrective actions:

Cost

1st transmission replacement @ 83,000 miles was covered under extended warranty

2nd transmission replacement @ 118,000 miles was goodwill 75%/self-pay 25%, so I paid around $1,200

3rd transmission replacement - I go to the dealer on Monday, so I'll let you guys know.
craigv23 is offline   Reply With Quote Quick reply to this message
Old 04-06-2014, 01:30 AM   #37 (permalink)
Registered User
 
Join Date: Feb 2005
Location: Southern California
Posts: 569
So each replacement transmission lasted roughly 30-40K miles, except that the original one lasted 83K miles?

I am beginning to suspect that Honda/Acura did not really "remanufacture" these transmissions, but sourced them out to some shady low-cost rebuilders.

As for me, I have three 2001 MDX but can only provide history on one which has been in the family since new. The other two are bought used much later.

TW started at 90K miles

Does get slightly louder with time, but not really noticeable.

Currently at 180K miles and still working fine.
__________________
2001 MDX
NewMDXOwner is offline   Reply With Quote Quick reply to this message
Old 04-07-2014, 12:38 AM   #38 (permalink)
Registered User
 
Join Date: Feb 2012
Posts: 11
Quote:
Originally Posted by NewMDXOwner View Post
So each replacement transmission lasted roughly 30-40K miles, except that the original one lasted 83K miles?
Yes for the last two transmissions. I bought the car certified pre-owned at 29,000, so I don't know if it had the transmission replaced before that. If it didn't, the first transmission lasted 83,000 miles, and if it did, the transmission lasted anywhere from 64K-83K.


Quote:
I am beginning to suspect that Honda/Acura did not really "remanufacture" these transmissions, but sourced them out to some shady low-cost rebuilders.
I think the design of the 01-02 models is flawed, and a transmission just won't last.

I'm going to the dealer tomorrow. Even though I'm technically 3.5K miles out of warranty, the problem started way before that with a low transmission whine. I'm going to explain that to the service manager, and hopefully he agrees to replace the transmission.
craigv23 is offline   Reply With Quote Quick reply to this message
Old 07-08-2014, 09:45 AM   #39 (permalink)
Registered User
 
Join Date: Mar 2014
Posts: 6
2006 Touring/ Nav

68,000 miles

I have noticed the whine for 4-5K miles.

Am thinking to have the fluid flushed at local place I have been going to for 10 years. Good idea? Maybe the fluid has lost it's viscosity?

I notice it when it's warmed up and under load. When it's cold it does not do this.
Pro Stock John2 is offline   Reply With Quote Quick reply to this message
Old 07-08-2014, 10:58 AM   #40 (permalink)
Registered User
 
Join Date: Feb 2005
Location: Southern California
Posts: 569
The whine does not necessarily come from the transmission.

Start the car but do not put it in gear, then turn the steering in both directions to see if it starts whining. If it does, then it's the O-ring on the P/S pump, not the transmission.

Even if the whine does come from the transmission, it's just an annoyance, not a real problem unless the transmission starts slipping.

Even though I have always advocated replacing the fluid often, doing so might only calm down the whine a little, but would not eliminate it completely. It comes from the under-load misalignment of the 3 (for '01-'02) or 4 (for '03-'06) parallel shafts due to wear on the aluminum bores of the shaft bearings. There is really nothing one could do short of disassembling the transmission and repairing the case bearing bores.
__________________
2001 MDX
NewMDXOwner is offline   Reply With Quote Quick reply to this message
Old 07-08-2014, 09:51 PM   #41 (permalink)
Registered User
 
Join Date: Apr 2014
Location: Dallas
Posts: 45
No Failure

04 220,000 driving. 30,000 towed behind RV
essbaum is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply


Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Acura MDX Forum : Acura MDX SUV Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Random Question

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 05:54 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.3.2
Copyright 2000-2010 MDXers.org. All Rights Reserved.