Installed new center bearing on 05 3.0 auto Sport. Experincing driveshaft vib around 70mph. Moving center bearing changes vibraton speed (50 to 75) depending on location. What are the driveline angles as mentioned below from JTIS?

"On 2.5L and 3.0L vehicles the driveline angularity is the angular relationship between the transfer case drive pinion, the driveshaft and the rear differential drive pinion. On 2.0L, 2.5L and 3.0L vehicles the factors determining driveline angularity include ride height and engine mounts."

Thx DA-X

 

DA-X, I am not quite sure what you are wanting. Keep in mind that the rear differential is mounted to the body of the car. SO, that do not move and is a reference point. The same can be said of the motor except in the case of a broken motor mount. Even then, the effect it has on things is minimal. So, front to rear, the driveshaft angle is pretty much fixed with the exception of the mounting of the centering bearing. This can affect the angle at which the u-joints mate up, which then can affect driveline vibration.

IN most cases, what you will find is that there is a match mark on the sleeve where the carrier bearing mounts to the body/frame. YOu need to match up these marks to minimize any vibration. Going too far forward offsets the angle between the rear diff and the middle joint, creating a vibration. Going too far back offsets the angle between the transfer case and the middle joint.

 

DA-X, exactly what type of bearing did you install?

P.S.
Oops, just now saw the link in another thread

 

Thx Themo-

A few months b4 i replaced the carrier I did replace the lower trans mount. I did notice I had to lift the trans slightly to replace the trans mount. I did notice the that if i lifted the tans slightly and tigheten the mount the engine would sit slightly higher vs not lifting the trans.

I was llooking for :

1)Transfer case drive pinion angle in degrees.

2) Rear differential drive pinion in degrees.

 

DA-X, sorry, I am on travel and don't have my JTIS with me. So, I can not help you there.

 

Np Just post when u find them.

 

In JTIS there is no data for these angles. But there is special Technical Service Bulletin from Jaguar about yours problem:
http://www.jagrepair.com/images/TSB/...0Vibration.pdf

 

Thx- I saw the TSB. I even replaced all the screws in both flanges.

 

I looked for the markings on the underbody where the carrier bolts on I did not see any. I did not see any marks on the carrier either. am I missing something I belive the carrier is in the right position on the drive shaft itself.
https://www.powertrainindustries.com...3jsesm6pnptlq7

 

IMHO.-> Rise car on the twin-post hoist and accelerate car to the speed of vibration. From bottom you can find where they come from.
Without stop the engine, just loose the retaining bolts of the driveshaft center bearing and let them to find its place by itself. Then tighten them again. It sometimes helps

 

I dont have a twin-post hoist. Maybe I can do the same on a quick spin around the block?

Im in the process of measuring the drive shaft angles.... see what i come up with.

 

Ok I figure out you must use the Underbody dimensions to figure out the exact placement of the carrier support bearing.


What I find interesting is the carrier is not "centered" in the middle of the body but offset to the right side of the car.

9-All vehicles 957.00 37.32in

10-All vehicles 997.00mm 38.88in

Next problem is where can i get a Subframe Alignment Kit ($1,400) or facsimile? I hate to have to pay the *********** a few hundred bucks to take a few measurements.

Since the tolerance is +/- 2mm looks like tape measure will be tricky. I need to extend the measuring points I and F down so I can get an accurate measurement any Ideas

Getting closer. These measurements should help others solve their propshaft vib problems after carrier replacement.

 

These dimensions can only be changed by hit (car accident). Carrier support
bearing settings are only along the axis of the vehicle and affect both
dimensions 9 and 10 simultaneously. Not by offset.
I think the problem is in the bearing itself.

 

I mentioned the offset becasue the the driveline sits slightly to the left by design. There is a 1/4" left to right adjustment because of the wide slots on the carrier. The carrier bearing has a 1 in slot that allows forward and backwards adjustment of dimensions 9 and 10 so these dimensions can vary.

So you think the new bearing that was installed is defective? I see no physical signs. No audible noise either. Rotates smoothly.

Spicer says in general :
Spicer heavy duty center bearings must be mounted within 3° of perpendicular to the coupling shaft centerline OR the center bearing assembly must not operate at a linear offset greater than 1/8".Note: The Spicer "XC" center bearing may be mounted up to +/- 10° of perpendicular to the coupling shaft
centerline. (The XC series is similar but not exact to the Hardy Spicer 3080-30 which is used in DA-X-Type
But im sure the similar geometric rules apply)

 

The only other issue I can see is:

1) Flange (s) runout out of spec.


2) Driveshaft runout out of spec.

Anyone have any experince on either?