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Ford 9N, 2N & 8N Discussion Forum
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My Rear End

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Ramrod

05-10-2005 20:29:29




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The Old Warrior (NAA) is ready for axles. Both are pulled and replaced with new bearings installed and ready. Thing is, where do I start? With both axles loose, they just meet in the middle and push the other one out. Seems to me, they count on the opposite axle to push against to get zero end play, is that right? If so, I guess I should just install one side with a few shims and then go to the other side and start setting preload? My stupid alarm is going off, so bear with me.

Ramrod

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Dan

05-11-2005 06:23:31




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 Re: My Rear End in reply to Ramrod, 05-10-2005 20:29:29  
You are on the right track in your line of thinking. Install one side with about 4 or 5 shims at first, then test bearing pre load by pushing/pulling in and out on the axle to see if it moves. Absolutely no movement? Take it apart and add another shim. Too much in/out movement (clunk, clunk, clunk), take it apart and remove a shim. You want to find a point where there is a minute amount of in/out movement. Once you have one side done, repeat the proceedure on the other side. When you are all done, you should be able to turn one axle and see the other axle spinning in the opposite direction. As Dell said, a little too loose is better than too tight. Most of the time, I can get my pre load perfect. With my NAA project though, the difference with ONE shim was too tight or loose, so I can hear just a tad of clunking when I push/pull at the top of my rear wheels. It bugs me, but I keep reminding myself it is better than too tight.

Good luck,
Dan

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Ramrod

05-11-2005 12:59:00




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 Re: My Rear End in reply to Dan, 05-11-2005 06:23:31  
Now I'm wondering if my new axles are too long. If they're both slid in, should I be able to push in the left and bump the right axle out a ways before hitting the stop in the trumpet?

There goes that noise again...

Ramrod



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Dan

05-11-2005 13:08:16




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 Re: My Rear End in reply to Ramrod, 05-11-2005 12:59:00  
Hmmm, I sure don't remember ever being able to move my opposite axle outward any appreciable distance by pressing inward on an axle. I have seen them touch and rotate the same direction (too tight of a bearing preload) so I know it will go that far. I would just do them one at a time (leave the other side bolted in place while you are working on the other side) and I am sure you will be fine - that is how I have done three different tractors so far.

I don't know if there is a spec somewhere that lists precise axle length.

Good luck,
Dan

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Ramrod

05-11-2005 06:34:06




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 Re: My Rear End in reply to Dan, 05-11-2005 06:23:31  
Call me dense, but I still can't get it straight in my head, just what is setting up the bearing load... Is it a function of the hub fitting on the axles that determines how many shims are needed? Do I have to torque the big nut on the shaft before checking for end play? That big nut is the only thing I see that can pull the bearing into the race. What's that noise? There goes my stupid alarm again!

Ramrod

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Dan

05-11-2005 07:10:21




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 Re: My Rear End in reply to Ramrod, 05-11-2005 06:34:06  
The hubs have nothing to do with this bearing. The hub just sits on the end of the axle with the tapered splines and held on with the big nut. The bearing is pressed onto the axle shaft, and the bearing retainer (the thick metal plate that holds the outer oil seal and bearing cup) goes OVER this and holds the axle in place by the bolts that attach it to the axle trumpet. The bearing on the axle keeps it from pushing back into the axle trumpet as is reduces down right there to the inner oil seal. This plate is what you are moving in and out with the shims.

HTH,
Dan

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Dell (WA)

05-10-2005 21:10:19




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 Re: My Rear End in reply to Ramrod, 05-10-2005 20:29:29  
Ramrod..... ..I heard yer alarm too. (grin)

Final result of rear axle bearing shiming is NO TOUCHY between the ends of the axles inside the differential. Iff'n BOTH axles rotate the same direction, they're touching and thats BAD. Un-touching rear axles allow the diffy to counter rotate the axles; thats GOOD.

I use a 2x4x3' channel bolted to my rear brakedrum for leverage to wiggle the axle for bearing clearance. Its so eazy to tell when you have no bearing clearance (bad) and just enuff bearing clearance. Remember, bearing clearances, too much is better'n too little but just right is bestest of all..... ...Dell

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