Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> tranny noise
SirAndy
post Jan 23 2004, 02:31 PM
Post #1


Resident German
*************************

Group: Admin
Posts: 41,688
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
ok, so i got this noise in the tranny.
having had a oil-leak, i tought i was simply running low on oil.
fixed the leak and filled up with fresh oil (swepco), noise is still there.

when slowing down and downshifting, i have a "whiny" noise very similar to the noise you get when driving in reverse and letting of the gas.
it's there in 2nd but even louder in 1st ...

shifting itself is fine, no crunching or anything.

any ideas?
Andy
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mightyohm
post Jan 23 2004, 02:35 PM
Post #2


Advanced Member
****

Group: Benefactors
Posts: 2,277
Joined: 16-January 03
From: Seattle, WA
Member No.: 162
Region Association: Pacific Northwest
Time for a new tranny. (IMG:style_emoticons/default/ohmy.gif)

Seriously whine is bad news. It might go for a long time but eventually something will let loose.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Jan 23 2004, 02:36 PM
Post #3


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None
should I be getting my car ready for us to drive down to Dunkels??
my AAA card is only good for 100 miles (IMG:style_emoticons/default/smile.gif)

Side or tailshifter?

I might have an extra one of each (IMG:style_emoticons/default/smash.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
vortrex
post Jan 23 2004, 02:41 PM
Post #4


Senior Member
***

Group: Members
Posts: 1,687
Joined: 24-December 02
From: SF, CA
Member No.: 4
Region Association: None
my beetle did that. bearings, right?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Jan 23 2004, 02:44 PM
Post #5


Resident German
*************************

Group: Admin
Posts: 41,688
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
QUOTE(Mueller @ Jan 23 2004, 12:36 PM)
Side or tailshifter?

sideshifter that was rebuilt a few thousand miles ago for some $2500 bucks. (IMG:style_emoticons/default/sad.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Jan 23 2004, 02:48 PM
Post #6


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None
drain some of the oil, look for "stuff" in it.....

does the noise change if you put a little force on the shifter in any direction?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mightyohm
post Jan 23 2004, 02:49 PM
Post #7


Advanced Member
****

Group: Benefactors
Posts: 2,277
Joined: 16-January 03
From: Seattle, WA
Member No.: 162
Region Association: Pacific Northwest
Take it apart now before a gear shatters or a bearing dies. James in SD (redbeard) should be able to give you advice.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Jan 23 2004, 02:51 PM
Post #8


Resident German
*************************

Group: Admin
Posts: 41,688
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
QUOTE(Mueller @ Jan 23 2004, 12:48 PM)
drain some of the oil, look for "stuff" in it.....

does the noise change if you put a little force on the shifter in any direction?

nope and nope ...

looked for debris when i cahnged the oil, nada.
noise doesn't change if i fiddle with the shifter.

Andy
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Jan 23 2004, 02:52 PM
Post #9


Resident German
*************************

Group: Admin
Posts: 41,688
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
QUOTE(jkeyzer @ Jan 23 2004, 12:49 PM)
Take it apart now before a gear shatters or a bearing dies. James in SD (redbeard) should be able to give you advice.

i guess it's rebuilding time again ... (IMG:style_emoticons/default/icon8.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Jan 23 2004, 03:27 PM
Post #10


Resident German
*************************

Group: Admin
Posts: 41,688
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
ok, now that i had some time to think about it, i have 2 more stupid questions: (IMG:style_emoticons/default/cool.gif)

1) if it's a bearing, why does it only make noise in the lower gears?
shouldn't it whine regardless of the gear selected?
i've tested higher gears, and there's no noise to speak of.

2) it just sounds like driving in reverse.
so, why IS reverse making that noise in first place?
and why doesn't it hurt the tranny?


Andy
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Jan 23 2004, 03:50 PM
Post #11


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None
the gears for reverse are straight cut instead of helical (I think???)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
nebreitling
post Jan 23 2004, 04:21 PM
Post #12


Member Emeritus
****

Group: Members
Posts: 3,314
Joined: 26-March 03
From: San Francisco
Member No.: 478
QUOTE(Mueller @ Jan 23 2004, 01:50 PM)
the gears for reverse are straight cut instead of helical (I think???)

yup, that's my understanding as to why reverse makes that noise as well.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Britain Smith
post Jan 23 2004, 05:20 PM
Post #13


Nano Member
****

Group: Members
Posts: 2,354
Joined: 27-February 03
From: Hillsboro, OR
Member No.: 364
Andy...is this noise only in reverse? If so, every car/truck makes a whining noise in reverse due to the straight cut gear. If this is all that you are worried about...then I don't think there should be anything to worry about.

-Britain
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Carrera916
post Jan 23 2004, 06:02 PM
Post #14


Member
**

Group: Members
Posts: 292
Joined: 9-February 03
From: Pleasanton, CA
Member No.: 273
Andy,

if its been spend for $2500 and the intermediate plate bearings hasn't been changed, I'll be damn surprised!

do you hear the whinning change when you accerate or de-accerate a bit on lower gears only? such as 1 & 2? if so, there's a good chance that the plate bearings is giving you problems. you see, the force of the two gears meshing on input and pinion shafts, does move the shafts apart a bit (that can get worse if the intermediate plate bearings are shot. Now, the other set of bearings in the gearbox case that hold the pinion shaft can be a problem if the beveled gears are moved around a bit. That usually cause the whining. The surface contact between two gears can make incrediable noise if you move one gear away or closer to the other gear, hence the whining noise.

I do not think the differential bearings would be the problem but I would double check to be sure its in good shape. Another area to look at, when you remove the gears from input shaft, take a closer look at the needle bearings that goes inside the gears, check that the surface of the race are smooth, not pitted....if so, there's the noise!

hope this helps...

jerry
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Jan 23 2004, 06:24 PM
Post #15


Resident German
*************************

Group: Admin
Posts: 41,688
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
QUOTE(Britain Smith @ Jan 23 2004, 03:20 PM)
Andy...is this noise only in reverse?

haha, you're either trying to get back to me for not reading your post right or you fucked up for real ...

re-read my post ........
Andy
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Jan 23 2004, 06:27 PM
Post #16


Resident German
*************************

Group: Admin
Posts: 41,688
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
QUOTE(Carrera916 @ Jan 23 2004, 04:02 PM)
hope this helps...

thanks for your input. guess i have to have brad take a look at it ...

Andy
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jan 23 2004, 08:13 PM
Post #17


Aircooled Baby!
**********

Group: Members
Posts: 13,035
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
Could be you ran it low enough of oil so the top intermediate bearing is sloppy now causing the noise elsewhere.

Geoff
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Gint
post Jan 23 2004, 10:28 PM
Post #18


Mike Ginter
***************

Group: Admin
Posts: 16,083
Joined: 26-December 02
From: Denver CO.
Member No.: 20
Region Association: Rocky Mountains
QUOTE
when slowing down and downshifting, i have a "whiny" noise


Whiner (IMG:style_emoticons/default/rolleyes.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Jan 24 2004, 01:35 PM
Post #19


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None
Usually when you hear the noise in reverse and the lower gears it's a bearing at the intermediate plate, as you shift into higher gears you are moving away from the plate and the bearing, then there is less load on the bearing and it gets quieter!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 15th June 2024 - 01:40 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...