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
+7
marc a
948
modenas
fliermike45
944-LT1
87-944S
skywalker01
11 posters
944Hybrids: 924/944/968 and 928 V8 Conversions :: Technical Stuff (other than motors) :: General Mechanical
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Torque tube bearing inspection
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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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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skywalker01- Posts : 477
Join date : 2009-07-22
Age : 60
Re: Torque tube bearing inspection
Oh, the horror, the horror, looks expensive
87-944S- Posts : 744
Join date : 2009-06-10
Location : Maryland
Re: Torque tube bearing inspection
Oh yeah - especially if I look at this alternative!!
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skywalker01- Posts : 477
Join date : 2009-07-22
Age : 60
Re: Torque tube bearing inspection
Quick......put it back together and act like nothing happened.
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944-LT1- Moderator
- Posts : 1265
Join date : 2009-06-09
Age : 102
Location : NOTRE DAME
Re: Torque tube bearing inspection
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!
skywalker01- Posts : 477
Join date : 2009-07-22
Age : 60
TT Bearings
Talk to Constantine, he's the TT bearing Guru.
PM me for his email address.
PM me for his email address.
fliermike45- Posts : 778
Join date : 2009-09-19
Re: Torque tube bearing inspection
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
skywalker01- Posts : 477
Join date : 2009-07-22
Age : 60
Re: Torque tube bearing inspection
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)
modenas- Posts : 285
Join date : 2009-06-08
Age : 35
Location : lubbock tx
Re: Torque tube bearing inspection
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!
skywalker01- Posts : 477
Join date : 2009-07-22
Age : 60
Re: Torque tube bearing inspection
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.
87-944S- Posts : 744
Join date : 2009-06-10
Location : Maryland
Re: Torque tube bearing inspection
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....skywalker01 wrote:Noticed a really bad vibration at speeds over 100,
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.
948- Moderator
- Posts : 573
Join date : 2009-06-09
Age : 108
Location : East PA
Re: Torque tube bearing inspection
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!
skywalker01- Posts : 477
Join date : 2009-07-22
Age : 60
Re: Torque tube bearing inspection
I started mine by hand and quickly decided that my impact gun, The Beast, was a better bet.skywalker01 wrote:other than having a sore shoulder from turning the threaded rod!
948- Moderator
- Posts : 573
Join date : 2009-06-09
Age : 108
Location : East PA
Re: Torque tube bearing inspection
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
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
marc a- Posts : 170
Join date : 2009-07-18
Location : Herndon, Va
Re: Torque tube bearing inspection
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.
skywalker01- Posts : 477
Join date : 2009-07-22
Age : 60
Re: Torque tube bearing inspection
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
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watsondk- Posts : 33
Join date : 2012-01-20
Location : Detroit, MI
Re: Torque tube bearing inspection
Where did you order the bearings from?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
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acorad- Posts : 697
Join date : 2010-12-21
Location : Agoura Hills, CA
Re: Torque tube bearing inspection
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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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...
watsondk- Posts : 33
Join date : 2012-01-20
Location : Detroit, MI
Re: Torque tube bearing inspection
Should be C4 clearance, not C3. All of the TT that I rebuilt and/or gutted had "C4" on the outer bearing surface. YMMV.
marc a- Posts : 170
Join date : 2009-07-18
Location : Herndon, Va
Re: Torque tube bearing inspection
Where did you get C4 bearings?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.
acorad- Posts : 697
Join date : 2010-12-21
Location : Agoura Hills, CA
Re: Torque tube bearing inspection
I got mine from here, you can thank Marc for the link
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87-944S- Posts : 744
Join date : 2009-06-10
Location : Maryland
Re: Torque tube bearing inspection
My TT bearings are grinding like crazy!87-944S wrote:I got mine from here, you can thank Marc for the link
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I see C3's at BDI, but not C4's.
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Did you have to order them special or something?
acorad- Posts : 697
Join date : 2010-12-21
Location : Agoura Hills, CA
Re: Torque tube bearing inspection
Search for 6006 c4 and you will find them. You want the double sealed version.
marc a- Posts : 170
Join date : 2009-07-18
Location : Herndon, Va
Re: Torque tube bearing inspection
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?
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?
watsondk- Posts : 33
Join date : 2012-01-20
Location : Detroit, MI
Re: Torque tube bearing inspection
Done, I should get them by early next week. Thanks!marc a wrote:Search for 6006 c4 and you will find them. You want the double sealed version.
acorad- Posts : 697
Join date : 2010-12-21
Location : Agoura Hills, CA
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944Hybrids: 924/944/968 and 928 V8 Conversions :: Technical Stuff (other than motors) :: General Mechanical
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