Hyatt roller min dia?

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2012: Hyatt roller min dia?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Rob Patterson, OZ on Saturday, August 18, 2012 - 12:45 am:

I understand that you can re-use the Hyatt bearings provided the rollers aren't under a certain size.
Does someone out there know the minimum diameter before they need to be discarded?
Any other info on their re-use would be beneficial too.
Thanks,
Rob


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dave Dufault on Saturday, August 18, 2012 - 06:17 am:

Are these threads any help to you?


http://www.mtfca.com/discus/messages/257047/295836.html?1339872393

http://www.mtfca.com/discus/messages/179374/202639.html?1301971548

Dave


Top of pagePrevious messageNext messageBottom of page Link to this message  By Larry Smith on Saturday, August 18, 2012 - 10:55 am:

Are you talking about the axle bearings or the driveshaft bearing????


Top of pagePrevious messageNext messageBottom of page Link to this message  By Rob Patterson, OZ on Saturday, August 18, 2012 - 03:47 pm:

Gentlemen, thanks for answering.
I should have done a search of old posts before I asked the question, because I found the answer there.
The (axle) Hyatt rollers have a new diameter of .500" and they can be used over and over so long as they are .495" or greater.
Once again, Thanks for answering.
Rob


Top of pagePrevious messageNext messageBottom of page Link to this message  By Hal Schedler, Sacramento on Saturday, August 18, 2012 - 04:53 pm:

After installing the bearing sleeve, slide in the original (ungreased) bearing to test fit. Grasp the axle tip and move it up and down and there should only be .005 movement (almost not perceptible). The bearing should slide in... Don't pound it. As you stated, the new rollers are 1/2 inch. It they are too tight select a bearing that is smaller etc.

Old used Hyatt bearings that are not pitted and have a solid "cage" work just fine. The original Hyatt bearing also has "spirals" for lubrication.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bud Holzschuh - Panama City, FL on Saturday, August 18, 2012 - 06:54 pm:

Not having access to the original Hyatt axle bearings, I recently purchased 2 from Lang's. Of course they are simple roller bearings without the spiral groves. No problems so far but I've only put about 300 miles on them.

I see dire warnings everywhere about using the new bearings, but has anybody actually had a failure ????

schuh


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dan Treace, North FL on Saturday, August 18, 2012 - 09:06 pm:

Bud

The failures reported on the forum seem to be mostly with the pinion bearing.

Here is a good older post from 2008, if you do down to Feb 20 4:06 a good summary of pinion failure is made. Both with Hyatt pinion and new solid rod pinion.
http://www.mtfca.com/discus/messages/29/47804.html


For the pinion, IMO the Fun Project modern taper bearing is the preference. New parts made for the original Hyatt pinion, such as the sleeve that fits on the drive shaft can give troubles, as the sleeve is critical to the bearing performance, and the Hyatt bearing with its flex ribbon rollers is required there. Cracks can form at the sleeve and cause trouble.



The new sleeves are so very hard, that the new solid roller pinion bearings seem to cause them problems. Not to say an old Hyatt pinion is perfect, they can break too...



As for the Hyatt rollers for the axle shafts, they provide 'flex' that is needed for the axle support, since the rear weight of the car is on these roller bearing. Study the design of the Hyatt and you can see the rollers are carried by 'dimples' of the outer cages. These dimples center on the roller ribbon, but allow movement too, sorta of in a circular fashion.



The individual spiral wrapped ribbon rollers can 'wander' and find their own centers....that is what makes the Hyatt such a good long-shaft bearing.

As for the 'solid' roller design. Have used them, and found immediate wear and looseness after 1000 miles. Don't use these anymore. That's my opinion. No catastrophe issues, but didn't like the roller pins being loose.



If you study the 'solid' roller design, you can see each solid rod has an axis pin, or axle that turns in a tiny hole in the cage. That means there are multiple 'mini-axles' turning at the rate of axle speed. Unlike the Hyatt ribbon roller that can 'float' in the cage, the 'solid' ones are fitted to the cage, and that tiny stem is what I found worn out in a short while. Causing the rollers to be off center. Being solid these rollers can't 'flex' with the bending on the axle shaft. Not my choice for a rear axle bearing.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Frank Harris from Long Beach & Big Bear on Saturday, August 18, 2012 - 10:00 pm:

I am wondering why we can't take four bearings that are let us say .490" or such but they must all be alike and then make new sleeves that are .005" thicker or what ever works for the four matching bearings that are worn down too small. It appears that it would also be easy to hard chrome some used bearing sleeves to a larger size by making them thicker so the under-sized bearings could be used. Don't raise the bridge, lower the river. It should work so why doesn't someone make this silk purse out of a sow's ear. It's a shame to throw away a good product when it is not being replaced with the same quality. It would be custom work but the quality would be just like N.O.S.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bud Holzschuh - Panama City, FL on Sunday, August 19, 2012 - 10:14 pm:

Wow Dan !

Great treatise on the hyatt bearings!

Guess I need to start looking.

Thank you

schuh


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chris Bamford, Edmonton AB on Sunday, August 19, 2012 - 10:52 pm:

Frank: "...Why we can't take four bearings that are let us say .490" or such but they must all be alike and then make new sleeves that are .005" thicker or what ever works for the four matching bearings that are worn down too small..."

Yes. And to make it even easier (ie not have to tool up for multiple sleeve thicknesses) perhaps we can just shim in the standard replacement sleeve with a few thou brass sheet to compensate for roller wear.

I used all my within-spec Hyatts on the two axles I rebuilt last year but kept all the <0.495 bearings just in case. If I have to rebuild another rear end I will try the shim trick. Thanks Frank.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jerry VanOoteghem on Monday, August 20, 2012 - 12:33 pm:

Frank,

It would be easier to make the axles oversize, versus thicker sleeves. The steel for sleeves is not available in a wide array of thicknesses.


Posting is currently disabled in this topic. Contact your discussion moderator for more information.
Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration