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Ford 9N, 2N & 8N Discussion Forum
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Pinion bearing preload

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Rob

07-20-2004 04:12:26




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The bearing preload on the 8N pinion is 12-16in/lbs. My torque wrench is like most and starts at 35in/lbs. I found one at Sears that started at 25in/lbs. The Ford auto dealership doesn't have a tool to read 14in/lbs and the rear-end mechanic sets the preload by 'feel.' Anyone know how to measure that low preload?
The spec on my Tbird is 14in/lbs.




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Hobo, NC

07-20-2004 06:56:03




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 Re: Pinion bearing preload in reply to Rob, 07-20-2004 04:12:26  
14in. lb would be fer a new bearing, a old bearing would not need preload or very little, tighen it up till ya fell a little drag. stop as soon as ya fell drag. Good luck on the noise, once a gear set gets a iregular wear pattern its their for the life of the set.



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Rob

07-20-2004 07:19:52




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 Re: Re: Pinion bearing preload in reply to Hobo, NC, 07-20-2004 06:56:03  
I've heard something like that all these years. I have removed the whine but I did that before I put more than a couple miles on the gear. That whine was clear once I reached 45mph and I turned around, jacked it up, put more preload on the bearing, and tried it again. I think I did that once more before the whine was gone. I got the noticable rumble out before 25 or 50 miles. I might be imagining the rumble I detect now, it's very slight and maybe not there at all. That gear-wear-is-forever saw you mention is why I fret so now. The whine is definately gone now though. If the wear was so slight maybe if I get it right it will wear back proper, dunno. Maybe it did.

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Hobo, NC

07-20-2004 10:01:43




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 Re: Re: Re: Pinion bearing preload in reply to Rob, 07-20-2004 07:19:52  
rotate the drive shaft 180 degs. and check the u-joints. always mark the drive shaft befor ya remove it so you can install back in the original position. don't know why but this is a problem on fords more than any other makes.



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Rob

07-20-2004 13:01:07




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 Re: Re: Re: Re: Pinion bearing preload in reply to Hobo, NC, 07-20-2004 10:01:43  
I marked it before I removed it. I have the Ford Shop Manual for that Tbird.
I know how to measure that small preload now I asked. Close enough anyway.



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ZANE

07-20-2004 05:22:59




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 Re: Pinion bearing preload in reply to Rob, 07-20-2004 04:12:26  
That bearing pre load is just not that critical.

The way I have done it for many years is by "feel".

I try to shim so that the shaft can still be turned by hand without feeling any extremely tight places in the revolutions or that it is not so loose that the shaft can be moved up or down or in and out.

You can use a dial indicator to assure that there is no side movement of the shaft. If you did get a reading from the dial indicator it would mean that the bearing pre load needed to be tighter until there was no indication on the meter. Then test the rotation of the shaft by hand to see if it is easily turnable.

If at any time you can't turn a shaft by one hand then it is probably too tight. This statement is only true according to the size of shaft in question. Of course a shaft that was two or three inches or more in diameter would require more effort to turn when the bearing pre load was correct. The larger the bearing the larger the pre load will be.

Zane

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Rob

07-20-2004 05:36:25




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 Re: Re: Pinion bearing preload in reply to ZANE, 07-20-2004 05:22:59  
I've gone back in to tighten the Tbird 3- or 4-times. I replaced the seal is all and didn't remove the shaft or bearing. It whined the first time or two and then I stopped the whine but it rumbled when going down a grade in cruise control, being slowed by the engine. It still rumbles a little on a long, high speed grade. That or I'm imagining it because I'm freting too much after getting it wrong at first. Might have had 750 miles on it before I got it so close. Worried it wore the gears wrong.

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ZANE

07-20-2004 13:28:13




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 Re: Re: Re: Pinion bearing preload in reply to Rob, 07-20-2004 05:36:25  
bearing pre load is not related to gear alignment as such. Gear mesh alingnment is determined by the shimming of the pinion in or out and the ring gear right or left to achieve the proper gear mesh alignment.

Of course the bearing pre load must be right on both the pinion and the ring gear carrier.

Zane



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Charles (in GA)

07-20-2004 05:07:43




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 Re: Pinion bearing preload in reply to Rob, 07-20-2004 04:12:26  
The Ford manuals I've seen show to measure preloads on rotating shafts by wrapping a string around them several times and pulling on the string with a very low poundage "fish scale". Is not this one done that way?

Charles



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Rob

07-20-2004 05:22:22




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 Re: Re: Pinion bearing preload in reply to Charles (in GA), 07-20-2004 05:07:43  
It gives the spec in inch-pounds. What do you read on the string that says how many inch-pounds? Just a straight reading of 12 to 16 pounds?
You know, the nearer the shaft to 2" OD the nearer you would be to reading inch-pounds. That sounds like a pretty good way.
Get out my duct tape and make it 2inches! Thanks.



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