TT Bearings??
10-05-2011, 03:08 PM
#1
Rennlist Member
Thread Starter
TT Bearings??
Why does my 928 not wanna go to SF??
On the drive to work, in the last 10 minutes it developed a grrowwwwl and vibration like you were going over the rumble strip on the side of the road..but lighter...coming from the middle O de car.
At 1800-2100rpm.
Not at any other RPM.
A diagnostic run up the RPM range to see if was anywhere else in the band..appeared to have cleared it.
Im betting TT bearing are on my short list now...too.
On the drive to work, in the last 10 minutes it developed a grrowwwwl and vibration like you were going over the rumble strip on the side of the road..but lighter...coming from the middle O de car.
At 1800-2100rpm.
Not at any other RPM.
A diagnostic run up the RPM range to see if was anywhere else in the band..appeared to have cleared it.
Im betting TT bearing are on my short list now...too.
10-05-2011, 03:48 PM
#2
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Probably rear carrier bearings
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
10-05-2011, 04:03 PM
#4
Captain Obvious
Super User
Super User
There is a good chance that it can also be one of the two torque converter bearings. Regardless, the TT, needs to come off to see it.
10-05-2011, 04:08 PM
#5
Archive Gatekeeper
Rennlist Member
Rennlist Member
There will be many pairs of trained ears when you get to Anaheim. 
Trending Topics
10-05-2011, 04:47 PM
#10
Archive Gatekeeper
Rennlist Member
Rennlist Member
I think Roger means rear hub carrier bearings, AKA rear wheel bearings? Or he's talking about something inside that big black Rogerbox thing on automatic cars...
10-05-2011, 05:18 PM
#11
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Rear Carrier bearings or Torque Converter bearings - same thing. In front of the rear flex plate in front of the Torque Converter.
5 times out of 10 when the owner says he has a bad torque tube it is the carrier bearings.
My GTS had the same noises after I bought the car at about 60k miles. Torque tube was fine but one of the carrier bearings was shot. Bearings are $30 each so change them out anyway when you pull the TT.
5 times out of 10 when the owner says he has a bad torque tube it is the carrier bearings.
My GTS had the same noises after I bought the car at about 60k miles. Torque tube was fine but one of the carrier bearings was shot. Bearings are $30 each so change them out anyway when you pull the TT.
Last edited by ROG100; 10-06-2011 at 02:37 PM.
10-05-2011, 05:18 PM
#12
Rennlist Member
Thread Starter
Cant be anything that is road speed specific.
Could make it hum & growl in neutral rolling down the highway by using throttle.
Its gone away (testing over lunch) since the WOT tuneup.
Could make it hum & growl in neutral rolling down the highway by using throttle.
Its gone away (testing over lunch) since the WOT tuneup.
10-06-2011, 01:43 PM
#14
Former Vendor
Join Date: Feb 2004
Posts: 2,139
Likes: 0
Received 0 Likes
on
0 Posts
Rear Carrier bearings or Torque Converter bearings - same thing. Behind the flex plate in front of the Torque Converter.
5 times out of 10 when the owner says he has a bad torque tube it is the carrier bearings.
My GTS had the same noises after I bought the car at about 60k miles. Torque tube was fine but one of the carrier bearings was shot. Bearings are $30 each so change them out anyway when you pull the TT.
5 times out of 10 when the owner says he has a bad torque tube it is the carrier bearings.
My GTS had the same noises after I bought the car at about 60k miles. Torque tube was fine but one of the carrier bearings was shot. Bearings are $30 each so change them out anyway when you pull the TT.
These bearings are in front of the torque converter flex plate. The snout of the flex plate assembly is pushed through the torque converter bearings which are pressed into the torque converter housing. They support the rear flex plate assembly that is bolted to the torque converter.
Cheers,