Diagnostic Help? Suspect Torque Tube
07-07-2010, 12:16 AM
#1
Rennlist Member
Thread Starter
Diagnostic Help? Suspect Torque Tube
Hi All,
I've been having an issue with some vibration...started during SITM actually.
At first I thought it was a tire balance issue, which it partially was, but now, after some checking (and a rebalance), It appears that I have a vibration coming in as the revs increase with the car in park. Of course, it's really pronounced at the usual highway revs in the 2200 to 3000 range, and manifests itself right in the assometer.
I'm thinking it might be the TT bearings, however there's no noticable noise.
Any thoughts and/or experience would be appreciated!
TIA.
I've been having an issue with some vibration...started during SITM actually.
At first I thought it was a tire balance issue, which it partially was, but now, after some checking (and a rebalance), It appears that I have a vibration coming in as the revs increase with the car in park. Of course, it's really pronounced at the usual highway revs in the 2200 to 3000 range, and manifests itself right in the assometer.
I'm thinking it might be the TT bearings, however there's no noticable noise.
Any thoughts and/or experience would be appreciated!
TIA.
07-07-2010, 12:18 AM
#2
Team Owner
that sounds like the damper may have a failed mount in the rear of the TT or the damper may not have been reinstalled after a TT rebuild
07-07-2010, 12:21 AM
#3
Rennlist Member
Thread Starter
My Guess
Iim hoping this doesn't involve dropping the trans.........
07-07-2010, 07:18 AM
#4
Former Vendor
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Hi Rob,
A failure of the dampener would be accompanied with an audible "clunk" from under the car when stepping hard on the throttle, brakes or going over bumps that jostle the car a bit. Thats the heavy metal weight clunking and rattling up and down the TT free from it's rubber holders. Below is a picture of one that's come apart.
Another possibility is the TT bearings have migrated in the TT and are now allowing the drive shaft to vibrate under operation. Usually it's the front bearing that has walked to the rear of the TT.
One way to check this is to remove the front clutch cover and look down the TT to see where the front bearing is. If it's past 15" or more then you have this problem.
HTH,
A failure of the dampener would be accompanied with an audible "clunk" from under the car when stepping hard on the throttle, brakes or going over bumps that jostle the car a bit. Thats the heavy metal weight clunking and rattling up and down the TT free from it's rubber holders. Below is a picture of one that's come apart.
Another possibility is the TT bearings have migrated in the TT and are now allowing the drive shaft to vibrate under operation. Usually it's the front bearing that has walked to the rear of the TT.
One way to check this is to remove the front clutch cover and look down the TT to see where the front bearing is. If it's past 15" or more then you have this problem.
HTH,
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07-07-2010, 08:56 PM
#8
Rennlist Member
Thread Starter
Now that's interesting....
Hi Rob,
A failure of the dampener would be accompanied with an audible "clunk" from under the car when stepping hard on the throttle, brakes or going over bumps that jostle the car a bit. Thats the heavy metal weight clunking and rattling up and down the TT free from it's rubber holders. Below is a picture of one that's come apart.
Another possibility is the TT bearings have migrated in the TT and are now allowing the drive shaft to vibrate under operation. Usually it's the front bearing that has walked to the rear of the TT.
One way to check this is to remove the front clutch cover and look down the TT to see where the front bearing is. If it's past 15" or more then you have this problem.
HTH,
A failure of the dampener would be accompanied with an audible "clunk" from under the car when stepping hard on the throttle, brakes or going over bumps that jostle the car a bit. Thats the heavy metal weight clunking and rattling up and down the TT free from it's rubber holders. Below is a picture of one that's come apart.
Another possibility is the TT bearings have migrated in the TT and are now allowing the drive shaft to vibrate under operation. Usually it's the front bearing that has walked to the rear of the TT.
One way to check this is to remove the front clutch cover and look down the TT to see where the front bearing is. If it's past 15" or more then you have this problem.
HTH,
Thanks for joining in Constantine. I suspect you've spent more time staring these systems than most of us.......
There's no discernable clunk when doing any of the things you've mentioned. Just this vibration that comes in starting around 1,800 rpm (I was paying more attention today) and gets really annoying at about 3,000. Over that it seems to settle somewhat, but it could be being overridden by the tires...originally VR, now "F'D".
New tires going on in three to five days.
Unfortunately though, I haven't got a clutch cover to pull. It's an auto.
Is it still possible to check if I drop the lower bell housing?
And, more important, if the front bearing is where it's supposed to be, what else might be the problem??
Finally, do you have the bearings for the '90 auto. I'm not sure which diameter it is, but I suspect the larger.
Thanks!
07-07-2010, 10:57 PM
#9
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Hi Rob,
No clunking is a good thing!
Yes, lower bell housing is what I meant, sorry for the confusion.
Ah yes, vibrations. Reading again your first post, it might just be standard collapsed engine mounts causing your vibrations in park and worn tires or out of round wheels causing the rest when your underway. I had an out of true wheel that caused vibrations underway but would always balance out well at the tire shop. Very frustrating to say the least. Became butter smooth with new wheels and tires. Guess you'll find out a bit more when you put your new tires on. Good luck!
Yes, we have the 28mm inserts for the newer thicker drive shaft.
No clunking is a good thing!
Yes, lower bell housing is what I meant, sorry for the confusion.
Ah yes, vibrations. Reading again your first post, it might just be standard collapsed engine mounts causing your vibrations in park and worn tires or out of round wheels causing the rest when your underway. I had an out of true wheel that caused vibrations underway but would always balance out well at the tire shop. Very frustrating to say the least. Became butter smooth with new wheels and tires. Guess you'll find out a bit more when you put your new tires on. Good luck!
Yes, we have the 28mm inserts for the newer thicker drive shaft.
07-07-2010, 11:38 PM
#10
Rennlist Member
Thread Starter
Thanks!
Hi Rob,
No clunking is a good thing!
Yes, lower bell housing is what I meant, sorry for the confusion.
Ah yes, vibrations. Reading again your first post, it might just be standard collapsed engine mounts causing your vibrations in park and worn tires or out of round wheels causing the rest when your underway. I had an out of true wheel that caused vibrations underway but would always balance out well at the tire shop. Very frustrating to say the least. Became butter smooth with new wheels and tires. Guess you'll find out a bit more when you put your new tires on. Good luck!
Yes, we have the 28mm inserts for the newer thicker drive shaft.
No clunking is a good thing!
Yes, lower bell housing is what I meant, sorry for the confusion.
Ah yes, vibrations. Reading again your first post, it might just be standard collapsed engine mounts causing your vibrations in park and worn tires or out of round wheels causing the rest when your underway. I had an out of true wheel that caused vibrations underway but would always balance out well at the tire shop. Very frustrating to say the least. Became butter smooth with new wheels and tires. Guess you'll find out a bit more when you put your new tires on. Good luck!
Yes, we have the 28mm inserts for the newer thicker drive shaft.
Just rec'd a voicemail .....new tires are in...Guess three to five days was to avoid issues. (Ordered them yesterday....
)However, I don't think that the new tires and balance are going to correct the vibration I've got "in park"
I'll PM for some options and pricing after I've run in the new tires.
Footnote: Crap!.....
07-08-2010, 11:00 PM
#12
Rennlist Member
Thread Starter
You Lose!
Hey Imre,
Motor mounts are new. Did them with the trans mounts last summer. Checked last weekend on the hoist, and pan is still level with the crossmember...........
Was going to call you to get your opinion and see if you had a little time to help me check this out.
Motor mounts are new. Did them with the trans mounts last summer. Checked last weekend on the hoist, and pan is still level with the crossmember...........
Was going to call you to get your opinion and see if you had a little time to help me check this out.