Rennlist - Porsche Discussion Forums

Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Moaning Sound

   
Old 06-29-2009, 01:38 PM
  #1  
vbatla
Instructor
Thread Starter
 
vbatla's Avatar
 
Join Date: Jan 2009
Location: Granger, TX
Posts: 100
Likes: 0
Received 0 Likes on 0 Posts
Default Moaning Sound
I've noticed an unusual "moaning/growling" sound coming from under the car. I can really hear it at startup. It seems like it's right under the shifter. (I have an automatic). Could this be the TT bearings going out? thanks...
vbatla is offline  
Reply Like
Old 06-29-2009, 01:39 PM
  #2  
Sailmed
Three Wheelin'
 
Sailmed's Avatar
 
Join Date: Dec 2005
Location: In the boatyard installing the mast and engine, we don't need a crane, we harness the mesquito's! Yeah!
Posts: 1,822
Likes: 0
Received 1 Like on 1 Post
Default
Could also be the darn cat trying to move.....
Sailmed is offline  
Reply Like
Old 06-29-2009, 01:46 PM
  #3  
sidehatch
Burning Brakes
 
sidehatch's Avatar
 
Join Date: Sep 2008
Posts: 770
Likes: 0
Received 1 Like on 1 Post
Default
Probably a hole by the cats,i noticed my tt bearings would whine,change pitch when you hit the gas,it went away when the flex plate was released.
sidehatch is offline  
Reply Like
Old 06-29-2009, 02:27 PM
  #4  
Fabio421
Man of many SIGs
Rennlist Member
 
Fabio421's Avatar
 
Join Date: May 2005
Location: Florida, USA
Posts: 8,722
Received 11 Likes on 5 Posts
Default
Are you sure its not a "hooting" sound?

https://rennlist.com/forums/928-foru...from-dash.html
Fabio421 is offline  
Reply Like
Old 06-29-2009, 03:20 PM
  #5  
bigmac
Drifting
 
bigmac's Avatar
 
Join Date: Feb 2006
Location: Ann Arbor,MI
Posts: 2,514
Likes: 0
Received 1 Like on 1 Post
Default
My daughter used to moan when I flored my 67 GTO
bigmac is offline  
Reply Like
Old 06-29-2009, 03:22 PM
  #6  
vbatla
Instructor
Thread Starter
 
vbatla's Avatar
 
Join Date: Jan 2009
Location: Granger, TX
Posts: 100
Likes: 0
Received 0 Likes on 0 Posts
Default
I knew I was opening the doors with this one!
vbatla is offline  
Reply Like
Old 06-29-2009, 03:34 PM
  #7  
Mrmerlin
Team Owner
 
Mrmerlin's Avatar
 
Join Date: May 2004
Location: Philly PA
Posts: 27,870
Received 2,242 Likes on 1,241 Posts
Default
has the flex plate been checked and the tension released?
Mrmerlin is offline  
Reply Like

Trending Topics

Old 06-29-2009, 04:35 PM
  #8  
vbatla
Instructor
Thread Starter
 
vbatla's Avatar
 
Join Date: Jan 2009
Location: Granger, TX
Posts: 100
Likes: 0
Received 0 Likes on 0 Posts
Default
No. And, I really don't understand what to look for when inspecting the flex plate. Was there an issue with it from the factory?
vbatla is offline  
Reply Like
Old 06-29-2009, 07:29 PM
  #9  
Charley B
Rennlist Member
 
Charley B's Avatar
 
Join Date: Apr 2006
Location: Patterson, Ca
Posts: 4,373
Likes: 0
Received 2 Likes on 2 Posts
Default
Charley B is offline  
Reply Like
Old 06-29-2009, 07:54 PM
  #10  
WICruiser
Burning Brakes
 
WICruiser's Avatar
 
Join Date: May 2005
Location: Chilton Wisconsin
Posts: 1,007
Likes: 0
Received 9 Likes on 5 Posts
Default
There are some very good write ups regarding thrust bearing failure as a result of not releasing the flex in the plate.

Basically you remove the lower bell housing cover (6 bolts) and lay a straigt edge across the plate. If it is bowed (many are) - loosen the clamp bolt to allow the flex plate to return to a flat condition - check end play of the crankshaft and with the crankshaft fully toward the rear retighten and torque the clamp bolt. I believe the revised torque spec. is 62 lb-ft but it maybe 65.

There is a replacement clamp that is more robust and should prevent future slippage but several people (me included) are planning to monitor the flex plate frequently with the original system for now.
WICruiser is offline  
Reply Like
Old 06-29-2009, 08:11 PM
  #11  
M. Requin
Rennlist Member
 
M. Requin's Avatar
 
Join Date: Mar 2007
Location: Central Virginia
Posts: 3,624
Received 59 Likes on 38 Posts
Default
I rollin', they moanin'
M. Requin is offline  
Reply Like
Old 06-30-2009, 01:10 AM
  #12  
vbatla
Instructor
Thread Starter
 
vbatla's Avatar
 
Join Date: Jan 2009
Location: Granger, TX
Posts: 100
Likes: 0
Received 0 Likes on 0 Posts
Default
Thanks for the flex plate info. Sounds like that needs to be checked regardless...
vbatla is offline  
Reply Like
Old 06-30-2009, 01:27 AM
  #13  
Dean_Fuller
Drifting
 
Dean_Fuller's Avatar
 
Join Date: Feb 2008
Location: Columbus, Mississippi
Posts: 3,029
Received 5 Likes on 5 Posts
Default
This is not how I imagined this thread considering the title...I must say I'm a little disappointed.
Dean_Fuller is offline  
Reply Like
Old 06-30-2009, 01:31 AM
  #14  
Warren928
Burning Brakes
 
Warren928's Avatar
 
Join Date: Jul 2003
Location: IL
Posts: 1,166
Likes: 0
Received 0 Likes on 0 Posts
Default
If its coming from under my car, then its gotta be my ex-wife. Problem solved, no need to fix anything.
Last edited by Warren928; 06-30-2009 at 01:32 AM. Reason: Cause I felt like it.
Warren928 is offline  
Reply Like
Old 06-30-2009, 01:29 PM
  #15  
Randy V
Addict
Lifetime Rennlist
Member
 
Randy V's Avatar
 
Join Date: Jun 2000
Location: Insane Diego, California
Posts: 40,429
Received 92 Likes on 62 Posts
Default
Originally Posted by vbatla
No. And, I really don't understand what to look for when inspecting the flex plate. Was there an issue with it from the factory?
Suggest you read through the New Visitor...FAQ topic posted at the top of this forum.

It's in there.
Randy V is offline  
Reply Like

Thread Tools
Search this Thread
Search this Thread:

Advanced Search

Advanced Search
Quick Reply: Moaning Sound


Reply Closed Thread Share
Forum Jump

All times are GMT -3. The time now is 07:16 PM.