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> my write-up on rebuilding a rack and adding turbo tie rod end
Wes V
post May 14 2009, 10:16 PM
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Well, here is a link to my latest write-up where I show how to rebuild a steering rack and add a turbo tie rod kit.

My Webpage

I know that there is an equal write-up on the Pelican board.

Let me know what you all think.

It's long and there are a lot of photos (god bless digital cameras)

Wes V
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Bartlett 914
post May 16 2009, 10:29 AM
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Nice write up.

If someone is doing this and is not replacing the needle bearing, I would make sure to measure the needles before assembly. I believe the diameters are not all the same! Half of them will be a bit smaller. Maybe only a thousandth or two. If I am correct, then the needles must be installed in an alternating state. This reduces the rotational resistance. Failure to do this will create a stiffer bearing that will fail prematurely.
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Wes V
post May 16 2009, 01:09 PM
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QUOTE(Bartlett 914 @ May 16 2009, 09:29 AM) *

If someone is doing this and is not replacing the needle bearing, I would make sure to measure the needles before assembly. I believe the diameters are not all the same! Half of them will be a bit smaller. Maybe only a thousandth or two. If I am correct, then the needles must be installed in an alternating state. This reduces the rotational resistance. Failure to do this will create a stiffer bearing that will fail prematurely.


That idea is too strange, but very possible!

Wes
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Bartlett 914
post May 16 2009, 06:08 PM
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QUOTE(Wes V @ May 16 2009, 01:09 PM) *

QUOTE(Bartlett 914 @ May 16 2009, 09:29 AM) *

If someone is doing this and is not replacing the needle bearing, I would make sure to measure the needles before assembly. I believe the diameters are not all the same! Half of them will be a bit smaller. Maybe only a thousandth or two. If I am correct, then the needles must be installed in an alternating state. This reduces the rotational resistance. Failure to do this will create a stiffer bearing that will fail prematurely.


That idea is too strange, but very possible!

Wes


Not so strange really.

Imagine the bearing laid out flat. Looking at the rollers from the end. The inner race at the bottom and the outer race on top. Rollers are touching the top and the bottom races and each roller is in contact with each other. As the bearing rotates, the top will go say to the right. This means the rollers rotate clockwise. If you draw this out you will see that where the rollers touch, the adjacent roller is rotating the in the wrong direction. As the right side of the roller rotates down, the back side rotates up causing a rubbing action with the roller behind it. If every other roller is smaller, than the smaller roller will not contact one of the races. This will cause the roller to rotate counter clockwise. Instead of rubbing, the rollers help each other rotate. This is a substantial reduction in friction. A bearing with a cage does not have this problem because the cage keeps them separate.




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Wes V
post May 17 2009, 09:33 AM
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That does make sense and I understand what you are saying.

When I was playing with my rack (damn that sounds strange), The bearings came out (that's how I know there were 26 of them) and before buying new bearings I re-installed them (in a bed of grease).

If they are different diameters, you sure wouldn't know it by touch or just by looking at them.

Wes
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