 Roaring noise when off the power, Transmission, CV joints, other? |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| Dave_Darling |
 Jun 10 2014, 01:03 PM
Post
#1
|
|
914 Idiot  Group: Members Posts: 15,196 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
 |
I noticed something today that I realized has been going on with my 914 for a while. Whenever I get off the power and coast, there's a roaring noise from the car. If I take the transmission out of gear, or if I put the clutch in, there's no noise. And if I add enough throttle to maintain speed or accelerate, no noise.
So it only happens when engine braking. Any ideas of where it could be coming from? This obviously won't be something that is easy to replicate in the garage... My thoughts were that it could be the CVs, objecting to being loaded the "wrong" way. Possibly time to repack/rebuild/replace them. Or it might be something in the transmission? I did rebuild the trans relatively recently (especially if you count miles, but not that many months ago) so it could be something I did there... --DD |
   |
 
|
  |
Replies
| Dave_Darling |
Jun 10 2014, 07:09 PM
Post
#2
|
|
914 Idiot Group: Members Posts: 15,196 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
|
I think it may be there in all gears, but I noticed it most in 5th.
I rebuilt the trans pretty recently. Sounds like I may have gotten something wrong. (IMG:style_emoticons/default/sad.gif) --DD |
|
|
|
| Jon B |
Jun 12 2014, 01:28 PM
Post
#3
|
|
Member Group: Members Posts: 73 Joined: 28-September 13 From: Vista, CA Member No.: 16,448 Region Association: None |
QUOTE(Dave_Darling @ Jun 10 2014, 06:09 PM)  I think it may be there in all gears, but I noticed it most in 5th. I rebuilt the trans pretty recently. Sounds like I may have gotten something wrong. (IMG:style_emoticons/default/sad.gif) One possibility: 5th gear on pinion shaft was installed backwards. Like other splined gears, it has a slight offset; if installed the wrong way, will move closer to underside of synchro hub on input gear. Because of helical teeth, input gear will move forward on decel, and synchro hub could hit gear on pinion shaft. Jon B. Vista, CA |
|
|
|
Posts in this topic
Dave_Darling Roaring noise when off the power Jun 10 2014, 01:03 PM
The Cabinetmaker One gear only, or any gear? Jun 10 2014, 02:05 PM rjames I wouldn't think it's the CVs since they a... Jun 10 2014, 03:19 PM Jeffs9146 Sounds like a bad bearing!
I had a similar so... Jun 10 2014, 03:59 PM jhadler Yep, that's a bearing. I'm sure the Evil D... Jun 10 2014, 04:03 PM r_towle Have you ever rebuilt the transmission?
Might mea... Jun 10 2014, 05:49 PM
okieflyr Diff whine? Jun 11 2014, 05:46 PM Krieger What trans mounts do you have? Some convey more n... Jun 11 2014, 07:46 PM balljoint Dave, check the rear trunk for that box of Frosted... Jun 11 2014, 07:54 PM r_towle :agree:
Differential whine possible from the wron... Jun 11 2014, 08:11 PM 76-914 :popcorn: Jun 12 2014, 09:08 AM Cap'n Krusty I just opened up a 915 with the same problem. Bad... Jun 12 2014, 09:15 AM Dave_Darling We replaced the bearings in the intermediate plate... Jun 12 2014, 10:49 AM Drums66 ....... :popcorn:
:wavebye: (check Fluid)A>K... Jun 12 2014, 01:36 PM
r_towle Did you happen to replace the carrier bearings and... Jun 12 2014, 02:29 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 4th July 2025 - 09:01 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.