HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Torque tube bearing inspection

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Torque tube bearing inspection

Post  skywalker01 on Sun Dec 11, 2011 5:42 pm

Noticed a really bad vibration at speeds over 100, so I decided to drop the transmission and take
a look at the torque tube and misc items - I'm glad I did!! The damage that you see was not done by the removal of the shaft and bearings and there is nothing is the tube that would lead one to believe that the carriers got caught on something. Either Fritz had a hangover on the day my car was built in '83, or somone prior to me botched this rebuild. I am glad I went through the hassle of looking at this!

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Re: Torque tube bearing inspection

Post  87-944S on Sun Dec 11, 2011 6:21 pm

Oh, the horror, the horror, looks expensive Laughing
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Re: Torque tube bearing inspection

Post  skywalker01 on Mon Dec 12, 2011 5:28 am

Oh yeah - especially if I look at this alternative!!
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Re: Torque tube bearing inspection

Post  944-LT1 on Mon Dec 12, 2011 6:44 am

Shocked

Quick......put it back together and act like nothing happened. Laughing

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Re: Torque tube bearing inspection

Post  skywalker01 on Mon Dec 12, 2011 7:03 am

While I wish I didn't have to go through all of the work to pull the bearings (shoulders are killing me!). I have no regrets knowing what I now know. The vibration was unbearable and would negatively affect any attempts to dyno/track the car. May end up going out on a search and destroy mission this weekend to locate another torque tube - but just want to say, if you have a weird vibration that you really can't locate and there's no noticeable grinding noises, you may really want to check your torque tube bearings!
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TT Bearings

Post  fliermike45 on Mon Dec 12, 2011 9:04 am

Talk to Constantine, he's the TT bearing Guru.

PM me for his email address.

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Re: Torque tube bearing inspection

Post  skywalker01 on Mon Dec 12, 2011 10:29 am

fliermike45 wrote:Talk to Constantine, he's the TT bearing Guru.

PM me for his email address.

Yeah - the picture is of his products . . . just a little pricey at $640 - may have to bite the bullet if I can't find a replacement in the wild
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Re: Torque tube bearing inspection

Post  modenas on Mon Dec 12, 2011 10:43 am

why did you go over 100 anyways?? If you didn't you would have this problem, but im glad you did ( a good test for bearings)
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Re: Torque tube bearing inspection

Post  skywalker01 on Mon Dec 12, 2011 4:10 pm

modenas wrote:why did you go over 100 anyways?? If you didn't you would have this problem, but im glad you did ( a good test for bearings)

There was a straightaway - no traffic. It was an opportunity, I took it! I'm glad I did too! Would have been embarassing to have the TT self destruct on the dyno!
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Re: Torque tube bearing inspection

Post  87-944S on Mon Dec 12, 2011 6:33 pm

With all the work on these, triple digits are definitely something I need to see, looking forward to a few good track opportunites to stretch the beast's legs! An ocassionally backroad is a good thing too. Wink
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Re: Torque tube bearing inspection

Post  948 on Mon Dec 12, 2011 9:30 pm

skywalker01 wrote:Noticed a really bad vibration at speeds over 100,
Skywalker, your road speed has no effect on the TT shaft speed; that speed is related to your engine RPM. You may want to look at wheels, tires, and the like also....
None the less, looks like those were well past due. I replaced the bearings in mine, saved the holders, using this as a guide.
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I have a whole spare TT if you need from an 88 944S. PM me if you can't locate one.
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Re: Torque tube bearing inspection

Post  skywalker01 on Tue Dec 13, 2011 5:33 am

948 - Thanks for the offer! It may be a viable option, especially with you being located in Eastern PA. I used the same guide to remove the bearings and really didn't have an issue getting them out (other than having a sore shoulder from turning the threaded rod). These carriers looked like they were previously banged out or something worse! As for the road speed ... that seems to be to only thing I can link to this vibration - I would think I would experience vibrations at harmonics of the speed. Will see how the search and destory mission goes this weekend!
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Re: Torque tube bearing inspection

Post  948 on Tue Dec 13, 2011 10:32 am

skywalker01 wrote:other than having a sore shoulder from turning the threaded rod!
I started mine by hand and quickly decided that my impact gun, The Beast, was a better bet. Laughing
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Re: Torque tube bearing inspection

Post  marc a on Tue Dec 13, 2011 9:06 pm

Pat,

Pick-up another torque tube and install an extra puck half way between the front of the tube and the first puck. I did this when rebuilding my tube to add a little more support to the shaft.

You might want to look for a tube from a car newer than '86 because the pucks are designed better. The rubber "belt" is bonded to the bearing carrier and the bearings press in rather than the carrier being two piece with the bearing sandwiched in between.

Marc
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Re: Torque tube bearing inspection

Post  skywalker01 on Thu Dec 15, 2011 10:28 am

marc a wrote:Pat,

Pick-up another torque tube and install an extra puck half way between the front of the tube and the first puck. I did this when rebuilding my tube to add a little more support to the shaft.

You might want to look for a tube from a car newer than '86 because the pucks are designed better. The rubber "belt" is bonded to the bearing carrier and the bearings press in rather than the carrier being two piece with the bearing sandwiched in between.

Marc

Thanks for the additional info!! We'll see what Crazy Rays has for a selection. Hopefully they were gentle with the forklift.
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Re: Torque tube bearing inspection

Post  watsondk on Wed Feb 20, 2013 7:36 am

Bringing up a dead thread but am rebuilding my torque tube and just ordered bearings. For those looking for quality bearings I believe these are the best readily available off-the-shelf. I picked my set of 4 up for less than $40 shipped Very Happy

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Re: Torque tube bearing inspection

Post  acorad on Wed Feb 20, 2013 10:10 am

watsondk wrote:Bringing up a dead thread but am rebuilding my torque tube and just ordered bearings. For those looking for quality bearings I believe these are the best readily available off-the-shelf. I picked my set of 4 up for less than $40 shipped Very Happy

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Where did you order the bearings from?
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Re: Torque tube bearing inspection

Post  watsondk on Wed Feb 20, 2013 10:23 am

Here is the link, hope its okay to post directly =)

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They add on shipping cost after the order so I'm not 100% on final cost but shouldn't be too bad.

Ideally our engines should be spinning closer to the rated rpm's of the bearing, bearings depend on a hydrodynamic film to develop between moving parts, but we aren't running those silly Wankel engines like an rx-7...Our bearings are loaded so lightly though that I don't anticipate crossing into a mixed lubrication regime:

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Bearing calculations were never fun in school...
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Re: Torque tube bearing inspection

Post  marc a on Wed Feb 20, 2013 5:41 pm

Should be C4 clearance, not C3. All of the TT that I rebuilt and/or gutted had "C4" on the outer bearing surface. YMMV. Smile
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Re: Torque tube bearing inspection

Post  acorad on Wed Feb 20, 2013 8:57 pm

marc a wrote:Should be C4 clearance, not C3. All of the TT that I rebuilt and/or gutted had "C4" on the outer bearing surface. YMMV. Smile
Where did you get C4 bearings?
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Re: Torque tube bearing inspection

Post  87-944S on Wed Feb 20, 2013 9:03 pm

I got mine from here, you can thank Marc for the link Very Happy

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Re: Torque tube bearing inspection

Post  acorad on Wed Feb 20, 2013 9:56 pm

87-944S wrote:I got mine from here, you can thank Marc for the link Very Happy

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My TT bearings are grinding like crazy!

I see C3's at BDI, but not C4's.

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Did you have to order them special or something?
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Re: Torque tube bearing inspection

Post  marc a on Wed Feb 20, 2013 10:16 pm

Search for 6006 c4 and you will find them. You want the double sealed version.
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Re: Torque tube bearing inspection

Post  watsondk on Thu Feb 21, 2013 5:46 am

Good find on actualy C4 bearings.

Not entirely sure why they used C4's from the factory, I can't imagine temperatures being that extreme in the TT, and while the bearings are in there tight a lot of that is due to the rubber insert's friction. I'm guesing the heat from the catalytic converter and exhaust? Any ideas of typical temperatures of the TT?
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Re: Torque tube bearing inspection

Post  acorad on Thu Feb 21, 2013 12:26 pm

marc a wrote:Search for 6006 c4 and you will find them. You want the double sealed version.
Done, I should get them by early next week. Thanks!
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