VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1929-1932 replacement diff. bearings

Hello friends overthere,

Did type the same in my old topic about passed by rear end, but maybe nobody did see it.
New try with new topic.
its about the replacement differential carrier bearings FS-73 sold by filling station instead of the original new Departure 0100
am in serious doubt and need an answer by somebody who did use the FS-73 parts.
Thanks for your answers about lubrication of the pinion front bearing, very helpful! Should not worry anymore about it.
Am actually just working to reassemble everything, but there is a doubt:
Want to do a good job, so all bearings there were part of the FS-order Chip did bring me now.
But:
The original ball bearings aside the differential ND 0100 are 0,70 inch thick, and the new ones by FS, (FS-73) are just 0,59 inch. By first view I am in doubt now.
Question: Are the threads of the adjustment rings of the diff. carrier bearings deep enough to fit with the much thinner new bearings?
Would be good to know that before pressing off the old bearings because they might get damaged while pressing off and if the new ones dont work I would end very sad with empty hands. The old ones ruined, the new ones in wrong size, not matching with the other parts.
Did anybody of you ever use the FS-73 bearing and can tell me hopefully good news about a perfect fitting replacement part?

Today I got the pinion ready for use. Had the pinion shaft in the deep freezing compartment of the freezer in my kitchen (sweetheart, what is that bullsh** between our food??) ok, no comment, and did heat the two bearings in the oven a bit (again no comment) and it was a simple thing to get everything together. Just simple physics...frozen stoff gets smaller, heaten stuff bigger, so I let the bearings just drop down and everything came in correct position just by own weight.

Ok, next step is adjustment of differential, would sleep better if I would know about my doubt what to do.
Want to install new bearings, because the old ones might be nor as good as they look, but if the new ones dont fit, I must use the old ones again.

Regards
Stefangermany

Hi Stefan,
I used the tapered bearings from the filling station with no problem. Are you measuring the overall width of the bearing with the race fitted over the roller bearing?
I remember my bearings being the exact width. By the way, my ND bearings had failed, so I had no choice but to replace them. I think you're smart going with the tapered set.

Hi jimk,
thanks for input, have everything reassembled now and it works.
Yes indeed I was to stupid to think about I must check the size of that kind of "open" bearing only completed with all parts, and I did check just the outer ring. Was my mistake.
Sometimes after some hours work I get blind for the easiest things. But now the diff is in and it looks good.
Other question: Because of the damage of my pinion I did use the complete set (pinion and diff) of a 1930 rear end in perfect condition.
Put pinion shaft and diff together today and it seems, the pinion is a bit to far out of the ring gear. Means I should add one or more shims to get it backwards. Must do a test with painting the gears tomorrow and see where is the point of contact between the teeth.
In case of need of additional shims, where to find them? Will post another topic at "parts needed" too.

Stefan

I just made my shims from shim stock.
When you test your gear contact pattern, I always force a small block of wood between the ring gear and the differential housing to take out the "slop" out between the gears as your rotating the pinion gear. This will give you a more accuate paint impression on the gear faces.
Good Luck!
Jim

Hello everybody,

Sorry, was stupid or blind or both together. Forgot to follow the old speech: "to trust is good, but to control is better"

The problem were not the shims at all, the problem were the replacement tapered roller bearings of diff. carrier. They were a little bit out of size, too big, just a "nicknack", but enough not to fit into the bearing carrier, so it was impossible to get the correct adjustment.

After reassembling the old original ball bearings it was done within half a day and now my Chevy runs good again.
Hope to get the original ND #0100 anytime and I may change to new bearings there too.

All pictures of 14 days of greasy work yoy may see here:
http://de.fotoalbum.eu/stefha/a466185/00000001
and following pics.

regards
stefangermany

Hi Stefan,
Glad you have you car back together, well done!
The front pinion bearing did not stand a chance with that bend in the torque tube.!

A fine job, always a difficult job.

And from your Homepage, I vey much enjoyed "taking a ride" with you in Bavaria!