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PostPosted: June 11, 2018, 12:49 am 
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Joined: April 19, 2018, 2:02 am
Posts: 18
I've got an Eaton Torsen diff for a chevy, it was going to be for a BEC (but sealing all the leaks may be a problem). It had tapered roller bearings on it and I pulled them off, and bent all my tools...

The journal measure 1.630" as close as I can measure with a caliper, the inside of the race measures about 1.627-1.628", again not super accurate and it might be deformed from pulling it. My question is is that supposed to be a 1 5/8" (1.625") journal? Is it oversize for a press fit? .005" seems ridiculously tight, but I don't know much about automotive stuff. If I were to want to put a roller bearing and a regular deep groove ball bearing on it, would I be looking for a 1 5/8" ID bearing or does it need to be something more specific, like .004" over or something? Or should I be looking for a different diff? I know Quaife has a ready made solution for BECs, but I'd have a hard time justifying that much money.

Thanks for any tips.


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PostPosted: June 11, 2018, 7:02 am 
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Joined: September 22, 2005, 8:12 am
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Location: 4AGE in S.E. Michigan
John
I agree, a .005" press fit does not sound right? As a general rule you want .0006 to .001" per inch Dia.
The next standard size bearing is a 1.6563 bore. That is not going to work. Take the bearing to an industrial bearing supplier. They should be able to match the P/Ns etched on the bearing or look for a replacement bearing on-line, assuming that you have a standard bearing. There are non-standard bearing in the auto industry, but if that is the case the Mfr probably tens of M's of them.
DaveW


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PostPosted: June 12, 2018, 2:45 am 
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The number on the bearing is LM501349-N, which comes up on a google search and some sites have it's ID as 1.625" or 41.275mm. Maybe tapered roller bearings need a super tight press fit. I suppose there is some axial force that could make it work it's way out. No, check that, the taper on the inner part the bearing would push it on tighter.

I guess worst case I could make an adapter collar/tube to the next size up ball bearing.

Thanks


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PostPosted: June 12, 2018, 8:09 pm 
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Joined: December 22, 2006, 2:05 pm
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Don't know what tools you used, but something like this works great for pulling bearings on diffs and transmissions:

https://www.amazon.com/8milelake-Splitt ... B01HZB8GSO

Often called a clam shell or bearing splitter with an extra heavy duty pulling arrangement, compared to a 3 or 4 jaw hinged puller.

The bearings are probably the same ones for the stock diff for the chevy application you mentioned.

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https://www.youtube.com/watch?v=Om3C1Ep ... D3E18BB447


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PostPosted: June 13, 2018, 1:14 am 
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Joined: April 19, 2018, 2:02 am
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Yea, I have the Harbor Freight equivalent. Bent the studs. I had so much tension on it that when the bearing finally moved it moved about 1/8" and there was still a huge amount on tension on the splitter studs.

Then I start looking at tapered roller bearings and they are talking about 10-20...wait for it...10-20 tons of pressing force to install. Um kay...


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PostPosted: June 13, 2018, 6:15 am 
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Joined: August 28, 2010, 7:53 am
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I used a torsen from a 90s camaro on a chain drive BEC. Had to machine the diff to accept sealed roller bearings. I don't remember the exact sizes but i don think i had to take much off.....prob less than .100"


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