Author Topic: Need advice on interference fit 9" axle  (Read 992 times)

Offline pkerot

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Need advice on interference fit 9" axle
« on: June 21, 2020, 01:26:42 PM »
I have installed rear axle shaft bearings on Ford 9" axles before but this time the lock ring doesnt want to go on.  I can only find Made in China bearings and I think the lock ring is too small. The axle shaft measures 1.378 and the lock ring I.D.  measures 1.368. My (admittedly bad) memory is telling me an interference fit should only be .003" (or is it .004"?) smaller than the shaft.  I looked around the internet and it looks like heating the lock ring will only make it grow .001" so that doesnt sound like it will help.
What do you think?

Offline jabberwoki

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Re: Need advice on interference fit 9" axle
« Reply #1 on: June 21, 2020, 01:43:54 PM »
Do you have a part number for the bearings?
Is the need enough? or does the want suffice?

Offline gtermini

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Re: Need advice on interference fit 9" axle
« Reply #2 on: June 21, 2020, 01:49:56 PM »
When I machine press fits, my general rule of thumb is 5 tenths to 1 thou squeeze per 1.0 inch of diameter depending on my mood and the part and the phase of the moon. In you case, with a thin, hard lock ring, I'd want no more than 2 thou squeeze. Just over a thou would be best to not worry about cracking the ring.

Those two numbers you put up are miles away from each other in the press fit world. The shaft diameter you put up is most likely 35mm rather than 1-3/8 oversize. A majority of bearings out there are metric regardless of OEM application. The retainer ring should be 34.95mm ID or 1.3765" ID

Offline pkerot

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Re: Need advice on interference fit 9" axle
« Reply #3 on: June 21, 2020, 07:26:34 PM »
Do you have a part number for the bearings?

B7az-1225  1 3/8 I.D.  2 13/16 O.D. this car is a 1959 Ford Galaxie

Offline jabberwoki

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Re: Need advice on interference fit 9" axle
« Reply #4 on: June 21, 2020, 09:23:21 PM »
I`ll do some looking for some USA bearings.
Is the need enough? or does the want suffice?

Offline pkerot

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Re: Need advice on interference fit 9" axle
« Reply #5 on: June 21, 2020, 10:52:08 PM »
thank you.  The chinese bearing is a  SKF RW207-CCRA

Offline jabberwoki

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Re: Need advice on interference fit 9" axle
« Reply #6 on: June 22, 2020, 07:44:54 PM »
Is the need enough? or does the want suffice?

Offline pkerot

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Re: Need advice on interference fit 9" axle
« Reply #7 on: June 22, 2020, 10:55:43 PM »
yes,Thank you.   I called him several days ago. He said he doesnt have one. And he is still  advertising as if he did have one.

Offline jabberwoki

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Re: Need advice on interference fit 9" axle
« Reply #8 on: June 23, 2020, 08:51:42 PM »
Look up new departure bearings .
Is the need enough? or does the want suffice?

Offline gtermini

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Re: Need advice on interference fit 9" axle
« Reply #9 on: June 23, 2020, 11:44:48 PM »
You could call McGuire Bearing http://mcguirebearing.com/ and give them all the dimensions and how it's supposed to go together. They can usually get whatever. I've always had good luck with them for industrial bearings.

Offline pkerot

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Re: Need advice on interference fit 9" axle
« Reply #10 on: June 24, 2020, 12:16:57 AM »
Look up new departure bearings .
Do you think the DELCO / New Departure Hyatt Bearing...RW507RR is the same?
This guy thinks so
https://www.ebay.com/itm/Wheel-Bearing-Rear-RW-207-CCRA/312167704641?hash=item48aea52841:g:yQ4AAOSwCExbYgMm
measurements look right
« Last Edit: June 24, 2020, 12:28:28 AM by pkerot »