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Topic-icon Steering stem removal on 1984 R100RS

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2 weeks 3 days ago #5804 by 11731
Hi guys, I’m asking for help removing the steering stem from my R100RS. I’ve got everything off, but it just won’t budge. Watching videos, etc (Boxer2Valve&ChrisHarris) on the web, I’m most certain that I’ve removed everything, and I expect it to come loose now. I suspect what's holding me us is the old grease behaving like cement. I’m looking to you to put my mind at ease.

I’ve tapped the top of the stem with hammer, placing a 2x4 between the stem and the hammer. I’ve also used the 2x4 to directly whack the stem. The stem just won’t move. I also used a hair dryer for several minutes to warm the grease in the top bearing. That softened the grease, but it didn’t help free-up the stem or give any perceptible gain of movement. I’ve not tried heating the lower bearing area, but only because it’s more difficult to get the hair-dryer in there.

Trying to remove it, it feels like there’s something solid holding it in place… like I’ve overlooked a fastener that needs to be loosened or removed. Is there some nut/bolt/other that most people (including me) overlook? Any help would be greatly appreciated.

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2 weeks 3 days ago #5805 by 8166
Replied by 8166 on topic Steering stem removal on 1984 R100RS
If you've got the top triple off, and removed the lock ring and spacer so you can see the top of the bearing, there's nothing holding the steering stem in place but friction and rust. Post a picture of it and we can be sure.

Heat, penetrating, oil, and patience are your friends. Use a propane or MAAP gas torch to heat that sucker 'till it smokes, then douse it in a good penetrating oil like Kroil or a 50/50 mix of ATF and acetone. Let it sit overnight, then repeat morning and night until a good wack on your 2x4 with a three pound hammer drives the steering stem out of the bearing.

Good luck, and may the Force, lots of it, be with you!

8166 Scot Marburger, This email address is being protected from spambots. You need JavaScript enabled to view it.
Check out the Yankee Hill AirTech Weekend, April 25-26, 2020

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2 weeks 3 days ago - 2 weeks 3 days ago #5806 by Wobbly
Replied by Wobbly on topic Steering stem removal on 1984 R100RS
It's possible that a look at the parts fiche will help you insure all the retaining bits have been removed. Try the ones on Max BMW.

shop.maxbmw.com/fiche/PartsFiche.aspx

All the work is done from the top side. Nothing retains the forks from the bottom side. The steering stem has 2 nuts: one on top of the Yoke (#4), and another under the Yoke (#3). So if you've removed the flat steel fork Yoke, then the topmost nut (the dome nut) is gone. The bottom (or adjusting) nut (#3) butts directly against the bottom of the Yoke and is not a "hex nut", it's more like a castellated sleeve that is tightened with a special tool.

Under the castellated adjusting nut is a dust cover for the top steering head bearing. Once the top bearing dust cover comes off, the stem is ready to be pressed down through the upper steering head bearing and the forks will literally fall off.



Hope this helps.

Don't hide 'em, Ride 'em !!
#15150
Last edit: 2 weeks 3 days ago by Wobbly.

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2 weeks 3 days ago #5807 by 11731
Replied by 11731 on topic Steering stem removal on 1984 R100RS
You guys are the best; thanks for the quick replies!
Sounds/looks like I need more heat and umph. I posted a photo here: photos.app.goo.gl/FA5KMk5tzLVG2Leg7

I went with the hairdryer because I was worried the Map-gas might be too hot. Maybe I worry too much :)

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2 weeks 3 days ago #5808 by 8166
Replied by 8166 on topic Steering stem removal on 1984 R100RS
From the looks of things, you're where you need to be.

More heat.

Try to find a piece of hardwood, like oak or maple. Pine will soak up a lot of the shock you need to break things loose.

And don't forget the penetrating oil.

You might want to thread the lock ring back onto the stem, but leave it backed off the bearing a bit so you'll know when the stem breaks loose. The reason is that if the stem begins to mushroom from beating on it, you might be able to back the lock ring off of it and save the threads. But the best way to avoid this scenario is more heat, more penetrating oil, and more time for things to soak and break loose.

8166 Scot Marburger, This email address is being protected from spambots. You need JavaScript enabled to view it.
Check out the Yankee Hill AirTech Weekend, April 25-26, 2020

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2 weeks 1 day ago - 2 weeks 1 day ago #5809 by Wobbly
Replied by Wobbly on topic Steering stem removal on 1984 R100RS

8166 wrote: You might want to thread the lock ring back onto the stem, but leave it backed off the bearing a bit so you'll know when the stem breaks loose. The reason is that if the stem begins to mushroom from beating on it, you might be able to back the lock ring off of it and save the threads.

• Better than that.... set the castellated nut FLUSH with the end of the steering stem. That gives a larger area for the wood to bear upon AND it also protects the threads.

• As much trouble as it is to get apart, you've got to be thinking at this point about having the ability to get it back together. That means protecting those threads.

• Hair dryer or heat gun won't do it. Too much heat is wicked off through the bearings into the frame. Concentrated heat, like the MAP gas, will do the job, but also remove the temper from the bearing. You'll need that inner bearing race fairly hot to get the penetrant to wick in and break that rust bond. But sacrificing a bearing will be worth it.

Hope this helps.

Don't hide 'em, Ride 'em !!
#15150
Last edit: 2 weeks 1 day ago by Wobbly.

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