BMW K bikes (Bricks)

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1Back to top Go down    How much play? on Tue Dec 04, 2018 4:04 pm

Neal Cooper

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Hi all,
I suspected a faulty crown wheel bearing and took the final drive apart.
I actually couldn't really feel any play in it.
The smaller roller bearing however seemed to have way too much play in it, but then I don't know how much is too much.
This is me squeezing the tapered bearing and the outer race moving a lot it seems to me...
What do you think?
How do I get it off and how do I extract the seat in the other half of the final drive?
Any answers appreciated.
Neal

    

2Back to top Go down    Re: How much play? on Tue Dec 04, 2018 4:09 pm

Neal Cooper

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Otherwise the whole thing looked in pretty good shape to me...

    

3Back to top Go down    Re: How much play? on Tue Dec 04, 2018 4:10 pm

Neal Cooper

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4Back to top Go down    Re: How much play? on Tue Dec 04, 2018 7:19 pm

RicK G

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The play you get like that means nothing it will reduce to almost nothing when assembled. You can tell more about wear on a roller bearing by looking at the state of the bearing surface of the cup which is the bit that is difficult to get out. To me it looks fairly worn because of the colour of the wearing surface, a dull grey and not bright silver. If you replace that bearing then you will need to reset the gears using shims etc. Best left to an expert.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

5Back to top Go down    Re: How much play? on Tue Dec 04, 2018 7:29 pm

Neal Cooper

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Thanks for that. So the play would not account for very small amount of play when trying to move the rear wheel as described in the manual - gripping in the 12 oclock 6 oclock position and pushing/pulling?

    

6Back to top Go down    Re: How much play? on Tue Dec 04, 2018 7:55 pm

RicK G

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It is quite possible as only a small amount of play in the bearing would account for even 1mm of play at the wheel extremities. To me that bearing is on the way out but it is very hard to say when the item is not in my hand. Take it to a bearing place they should know.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

7Back to top Go down    Re: How much play? on Wed Dec 05, 2018 8:48 am

92KK 84WW Olaf

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My friend over here who rebuilds final drives did say once you feel any play at the rear wheel you have trouble and if you get it early you save the final drive. The only part at that point to replace seems to be the bearing. In my case I was sensitive to a very minor difference in feel and had asked him for a second opinion as at that point it felt different but felt like it had no play in it.

I am with RickG on what he posted. The trick on reassembly is to get that point where there is no play but its not binding.


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1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 84,600 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

8Back to top Go down    Re: How much play? on Wed Dec 05, 2018 9:10 am

mike d


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To remove the outer bearing race from the hub requires a 'blind hole' puller. This uses an expanding collet to grip on the fine chamfer on the bearing and a slide hammer to provide the shock to pull the bearing out.

Such as:
http://sykes-pickavant.com/products/pullers-and-separators/mechanical-pullers-and-kits/856

If you are a member of The BMW Club (UK) then they have a tool hire facility which has the required special tools.

Mike

    

9Back to top Go down    Re: How much play? on Wed Dec 05, 2018 5:11 pm

Snod Blatter

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@RicK G wrote:It is quite possible as only a small amount of play in the bearing would account for even 1mm of play at the wheel extremities.
This, I had 1mm of play at the outside of the tyre but to handle the crown wheel bearing you wouldn't have known anything was wrong. The only giveaway is it feels a bit rough when you spin the outer race.

The tapered bearing is loose like that and hardly ever seems to wear, I wouldn't worry about it.


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1989 K100RS SE ABS 8v VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

10Back to top Go down    Re: How much play? on Wed Dec 05, 2018 6:53 pm

Neal Cooper

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OK I get what you're saying. Thanks for taking the time to reply.

    

11Back to top Go down    Re: How much play? on Wed Dec 05, 2018 6:55 pm

Neal Cooper

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@mike d wrote:To remove the outer bearing race from the hub requires a 'blind hole' puller. This uses an expanding collet to grip on the fine chamfer on the bearing and a slide hammer to provide the shock to pull the bearing out.

Such as:
http://sykes-pickavant.com/products/pullers-and-separators/mechanical-pullers-and-kits/856

If you are a member of The BMW Club (UK) then they have a tool hire facility which has the required special tools.

Mike
Thanks Mike. Cheers for the link too!

    

12Back to top Go down    Re: How much play? on Wed Dec 05, 2018 6:59 pm

Neal Cooper

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What do you all think of this? I found it very informative.

    

13Back to top Go down    Re: How much play? on Wed Dec 05, 2018 7:09 pm

Snod Blatter

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It's the best guide around! A guy on here recently cut his old bearing off (or he was going to..?), might be a good way to attack the most difficult part of the process.


__________________________________________________
1989 K100RS SE ABS 8v VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

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