BMW K bikes (Bricks)

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1Back to top Go down    Gearbox Bearings - Replacing on Sun Mar 30, 2014 4:40 am

floyd

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Im really unsure about my gearbox bearings. Ive got it stripped down and ready to go back together, Im just unsure of the state of the bearings, as Ive not got much experience in judging such things. (NB: Incase your wondering....I opened it to replace all the seals, and also because im a curious s.o.b)

While im this deep in the box, and also considering its a 220,000km bike, should I just replace the bearings anyway?

I have another intact gearbox here of slightly newer vintage, perhaps ill open it and compare its bearings with these ones, for reference....


In Aus, is it cheaper to buy the suitable bearings from a local bearing shop, or is the Bins still the cheapest option?

If I just dropped the shafts and new bearings off at a bike mechanic would they be willing to do the swap for me? How many hours labour do ya reckon that would be? Only 1 I would hope.;..?

Or anyone wanna lend me a bearing splitter/puller/whatever other special bits are needed?


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K100 with lots of K1100 bits - mongrel of a thing...
    

2Back to top Go down    Re: Gearbox Bearings - Replacing on Sun Mar 30, 2014 5:09 am

RicK G

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They are very common sizes and should cost no more than $70 including the seals even buying a high quality brand like SKF or Timken.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

3Back to top Go down    Re: Gearbox Bearings - Replacing on Sun Mar 30, 2014 5:12 am

floyd

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@RicK G wrote:They are very common sizes and should cost no more than $70 including the seals even buying a high quality brand like SKF or Timken.

Each or for the set?


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K100 with lots of K1100 bits - mongrel of a thing...
    

4Back to top Go down    Re: Gearbox Bearings - Replacing on Sun Mar 30, 2014 5:20 am

RicK G

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The whole six. One of the tapered roller bearings is the same as a front wheel bearing for a holden


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

5Back to top Go down    Re: Gearbox Bearings - Replacing on Sun Mar 30, 2014 5:27 am

floyd

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@RicK G wrote:The whole six. One of the tapered roller bearings is the same as a front wheel bearing for a holden

Wonderful. Bearing shop - here I come...

Hmmmm to do it my self or not do it my self. That is the question....

Twisted EvilDo it do it dooooo itTwisted Evil


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K100 with lots of K1100 bits - mongrel of a thing...
    

6Back to top Go down    Re: Gearbox Bearings - Replacing on Sun Mar 30, 2014 6:32 am

floyd

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Ok, I think I have all the specs for my K100RS gearbox and K100/K1100 hybrid frame/front end....

Correct any of this those of you in the know....

Steering Head -TAPERED ROLLER BEARING -28X52X16 -2
GB OutputGROOVED BALL BEARING20X47X14MM1
GB OutputGROOVED BALL BEARING25X52X15MM1
GB InterGROOVED BALL BEARING17X47X142
GB InputTAPERED ROLLER BEARING45,24X16,64X221
GB InputTAPERED ROLLER BEARING45X19,05X15,51



Last edited by floyd on Sun Mar 30, 2014 7:27 am; edited 2 times in total


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K100 with lots of K1100 bits - mongrel of a thing...
    

7Back to top Go down    Re: Gearbox Bearings - Replacing on Sun Mar 30, 2014 7:22 am

charlie99

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don't forget there is a preload on the fitting up Floyd ...the Haynes manual describes this pretty well

good luck mate !


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

8Back to top Go down    Re: Gearbox Bearings - Replacing on Sun Mar 30, 2014 7:25 am

RicK G

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When you get the ball races they will have a rubber seal on both sides just put a sharp screwdriver and get rid of the seals (they come very easily). You can get the shielded bearing with a steel shield on both sides but they are heaps more and not really needed.


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

9Back to top Go down    Re: Gearbox Bearings - Replacing on Sun Mar 30, 2014 7:26 am

floyd

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@floyd wrote:Ok, I think I have all the specs for my K100RS gearbox and K100/K1100 hybrid frame/front end....

Correct any of this those of you in the know....

Steering Head .TAPERED ROLLER BEARING .28X52X162
GB OutputGROOVED BALL BEARING20X47X14MM1
GB OutputGROOVED BALL BEARING25X52X15MM1
GB InterGROOVED BALL BEARING17X47X142
GB InputTAPERED ROLLER BEARING45,24X16,64X221
GB InputTAPERED ROLLER BEARING45X19,05X15,51


The input bearing measurements seem weird...???


Thanks charlie!


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K100 with lots of K1100 bits - mongrel of a thing...
    

10Back to top Go down    Re: Gearbox Bearings - Replacing on Sun Mar 30, 2014 7:57 am

RicK G

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3/4 inch and 5/8 inch
One more thing is when you remove the cover make sure not to mix the shims, They will probably be stuck to the inside of the cover with thick gooey oil. Keep an eye for them often you don't pick up they are there till washing is complete and they are in the tub and don't ask.


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

11Back to top Go down    Re: Gearbox Bearings - Replacing on Mon Mar 31, 2014 2:38 am

floyd

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@RicK G wrote:3/4 inch and 5/8 inch
One more thing is when you remove the cover make sure not to mix the shims, They will probably be stuck to the inside of the cover with thick gooey oil. Keep an eye for them often you don't pick up they are there till washing is complete and they are in the tub and don't ask.

Already made that mistake and mixed the shims up.....

Just went to the bearing shop and they were mighty pissed off that I didn't have a specific number for each bearing, only the measurements (they seem to be continually amazed that the general public are oblivious to the nuances of the bearing world)

One bearing in particular, he reckons does not exist, based on the specs I got from a micro fiche (45.24 X 16.64 X 22)

Bearing in question is the closest to the splines on the input shaft.

Anyone have these mythical numbers?


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K100 with lots of K1100 bits - mongrel of a thing...
    

12Back to top Go down    Re: Gearbox Bearings - Replacing on Mon Mar 31, 2014 3:15 am

charlie99

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you haven't seen this yet Floyd ?
you might have to get the password for the downloads section ?

oopps disappeared



Last edited by charlie99 on Mon Mar 31, 2014 4:52 am; edited 1 time in total


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

13Back to top Go down    Re: Gearbox Bearings - Replacing on Mon Mar 31, 2014 3:17 am

floyd

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No I hadnt seen it Charlie, but literally seconds before you replied I stumbled apon it via google :0

What a fantastic resource. This forum makes me so glad I bought a K bike!

Thanks mate, that should keep them happy.



Last edited by floyd on Mon Mar 31, 2014 4:52 am; edited 1 time in total


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K100 with lots of K1100 bits - mongrel of a thing...
    

14Back to top Go down    Re: Gearbox Bearings - Replacing on Mon Mar 31, 2014 4:51 am

charlie99

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you realize I will have to remove the direct link to the downloads section ...hope you got it bookmarked

have fun Floyd ...and stick it up those bearing guys .....


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

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