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Old 01-05-2007, 06:53 AM   #1
Suppermotodd OP
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Question R100GS Gearbox Repair

I am rebuilding my BumbleBee trany and found this double sealed bearing in the mix. The new bearing is not sealed at all and would seem to be correct choice. I also noticed that this is the only SKF bearing in the gearbox. Have any of you run into this before? Is this a factory screw up or has the gearbox been worked on before?



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Old 01-05-2007, 07:51 AM   #2
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Been worked on before is my best guess as they are all open C3 or C1 (?).
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Old 01-05-2007, 11:47 AM   #3
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Talking Bearing R/R

Here are a few pics of the bearing replacement. All you need is a 20 ton press and a BFH.







Big Orange Country! GO VOLS!



BFH




Output shaft is done!
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Old 01-05-2007, 12:06 PM   #4
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Yea! that one is done!! Get that Beyotch back together, man.


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Old 01-05-2007, 12:20 PM   #5
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you put a pillow under the press right? he he he.

At first glance I imagined the gears and shaft bouncing off the concrete floor.
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Old 01-05-2007, 12:38 PM   #6
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Quote:
Originally Posted by datchew
you put a pillow under the press right? he he he.

At first glance I imagined the gears and shaft bouncing off the concrete floor.
I put rug and coat under it. Just in case I droped it!
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Old 01-05-2007, 12:46 PM   #7
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Quote:
Originally Posted by Suppermotodd
I am rebuilding my BumbleBee trany and found this double sealed bearing in the mix....Is this a factory screw up or has the gearbox been worked on before?
I list the various tranny bearings on my website:

http://www.largiader.com/tech/airtrans/
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Old 01-05-2007, 12:52 PM   #8
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Quote:
Originally Posted by Suppermotodd
Here are a few pics of the bearing replacement. All you need is a 20 ton press and a BFH.







Big Orange Country! GO VOLS!



BFH




Output shaft is done!
yep Snap-on sockits thay have so many uses.
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Old 01-05-2007, 01:02 PM   #9
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Quote:
Originally Posted by AntonLargiader
I list the various tranny bearings on my website:

http://www.largiader.com/tech/airtrans/
Thanks for the link Anton! Your site is very informative.
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Old 01-05-2007, 01:06 PM   #10
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Laugh Snap On

Quote:
Originally Posted by friar mike
yep Snap-on sockits thay have so many uses.
It was the only thing I had that was the correct size. I felt really bad banging on that high dollar socket but what's a man to do?
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Old 01-05-2007, 03:08 PM   #11
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Quote:
Originally Posted by Suppermotodd
It was the only thing I had that was the correct size. I felt really bad banging on that high dollar socket but what's a man to do?
As an alternative to banging and risk damaging the bearing would be to heat the bearing and leave the shaft in the freezer for a 1/2 hr.
Mating the two then should only require minimal tapping on the bearing or assemble it back in the press.

I recently replaced the timing chain crankshaft sprocket which req'd a 3 jaw puller and considerable effort to get it off due to the shrink fit.
To install the new sprocket I placed a bag of snow around the crankshaft nose for a 1/2 hr and then heated the sprocket.
The sprocket then "dropped" onto the crank by hand. A lite tap on a socket ensured it was home...but it already was.
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Old 01-06-2007, 10:14 AM   #12
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if you get crazy with heating/cooling
I find that dry ice with the part in a cooler works well.

Just gives you a few more degrees than regular ice or your freezer.
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Old 01-07-2007, 07:19 AM   #13
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I've been following info on tranny rebuilds closely cause I'd like to do one someday when I get a garage.

Many folks with their online how-to's make it look so much easier than the book does. Books show tons of feeler gauge-ing and etc.

When you press the bearings on, do you simply press them until they seat to a pre-machined groove on the shaft or do you have to measure it? If there's a "seat" on the shaft, that seems to me to be pretty easy and the rest is just measuring to check for wear tolerance.

Can the circlip groove be cut into the shaft with the gears still on the shaft as long as the bearings are removed? Could a local machine shop do it if you give the right measurements?

I guess like anything else, it seems like a bunch of voodoo until you get your hands on one.
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Old 01-07-2007, 01:39 PM   #14
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Quote:
Originally Posted by datchew
When you press the bearings on, do you simply press them until they seat - YES
Your critical measurements come when determining the proper shim stack thickness for the shaft end play.

The sealed bearing mentioned in the earlier message is becoming a common practice. The late model BMW transmissions used sealed bearings. The theory is you keep all the metal bits out of the bearings that way. Some mechanics are rebuilding our older transmissions using all sealed bearings.
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Old 01-07-2007, 05:26 PM   #15
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Quote:
Originally Posted by Middleweightboxer
Your critical measurements come when determining the proper shim stack thickness for the shaft end play.

The sealed bearing mentioned in the earlier message is becoming a common practice. The late model BMW transmissions used sealed bearings. The theory is you keep all the metal bits out of the bearings that way. Some mechanics are rebuilding our older transmissions using all sealed bearings.
I guess i'm torn on that method. You not only keep the metal bits out, you keep the fresh fluid out also. Granted, sealed bearings, especially roller bearings, last a very long time. But if you're good enough to change the fluid regularly, I have to say, I'd probably feel better about the non-sealed bearings.

Can you give more info on the shim stack thickness?
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