Steering head bearing - Wrist Twisters
 
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post #1 of 8 Old 02-10-2014, 05:47 PM Thread Starter
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Steering head bearing

Okay, need some help here. I've put the lower triple on the SV, and have run into a slight snag. When turning it side to side, it feels like there is a little resistance at some point (like a notch), then is fine again. For those that have worked with these before, a couple of questions:

Is it possible that I just have it a little on the tight side? Just enough to cause some binding? Or would it be evenly tight as I turn it? They are tapered bearings, BTW.

I'm pretty sure I got the races in straight, but would the slightest offset (say less than 1mm) cause similar symptoms?

One other piece of info: I took the stem out and put it back in, and the point at which it sticks moved...

Thanks for any help. Hoping I don't have to punch the races back out!

Stu

'96 DR650, '01 SV650, '10 Aprilia Tuono 1000R
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post #2 of 8 Old 02-10-2014, 06:36 PM
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A hair out of square will do it.
How clean were the receiving bores ?
Did you check to see that all races are perfectly registered ?

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post #3 of 8 Old 02-10-2014, 07:12 PM Thread Starter
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Made sure the bores were clean and burr-free. I think I got it sorted now, though; I tightened the nut a smidgen too much. Loosened it about 1/8 turn, tightened the top nut, and now it's smooth without having any play. It's been a little trail and error to get it just right, because tightening the top nut snugs things up just a bit.

For future reference, when you say perfectly registered, is there a good way to check? I did the best I could to examine with a small mirror, but I doubt that would've shown me a small gap. I tapped them, using the old races, after installation to try to be sure they were fully seated, but that obviously wouldn't fix things if a shaving had gotten in between...

'96 DR650, '01 SV650, '10 Aprilia Tuono 1000R
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post #4 of 8 Old 02-10-2014, 08:16 PM
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sometimes if you tighten it too much you can put a flat spot on one of the ball bearings fyi.

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post #5 of 8 Old 02-10-2014, 08:23 PM Thread Starter
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Quote:
Originally Posted by nd4spdbh View Post
sometimes if you tighten it too much you can put a flat spot on one of the ball bearings fyi.
That was one of my concerns, and hopefully not the case. Hopefully the fact that it smoothed out means this wasn't the case. The instructions gave a torque setting to start with to get things seated, then I loosened from there.

'96 DR650, '01 SV650, '10 Aprilia Tuono 1000R
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post #6 of 8 Old 02-10-2014, 09:05 PM
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I usually over tighten them a touch, not stiff and notchy but overly snugg.... then roatate the triples to seat everything. Then back it off until the head set motion feels right, with no play.

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post #7 of 8 Old 02-10-2014, 09:45 PM Thread Starter
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It's funny how little it takes. The lower nut is barely finger tight.

'96 DR650, '01 SV650, '10 Aprilia Tuono 1000R
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post #8 of 8 Old 02-12-2014, 04:36 PM
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Quote:
Originally Posted by Superdog View Post
Made sure the bores were clean and burr-free. I think I got it sorted now, though; I tightened the nut a smidgen too much. Loosened it about 1/8 turn, tightened the top nut, and now it's smooth without having any play. It's been a little trail and error to get it just right, because tightening the top nut snugs things up just a bit.

For future reference, when you say perfectly registered, is there a good way to check? I did the best I could to examine with a small mirror, but I doubt that would've shown me a small gap. I tapped them, using the old races, after installation to try to be sure they were fully seated, but that obviously wouldn't fix things if a shaving had gotten in between...
If space permits, try to do a feeler gauge check between the seat of the bore and the registering end face of the outer race.
2 thou max feeler, you want it thin and easy to curve with a tight radius so you can attack the intended check points.
No feeler should go in.
A strip of shim stock can be cut and used as well.

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