BMW K bikes (Bricks)


You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down    Steering on Fri Jun 30, 2017 6:41 am

Bunyak100

avatar
active member
active member
Can anyone give advice regarding the removal technique of the stem from the lower fork clamp, my on has moved due to fork damage and is a few degrees off centre, and not square with two fork clamp holes, I have check runout with daily gauge and a square. I would like to remove cleanup, check stem for straightness and reinstall. Is it threaded or an interference fit, there does not appear to be any circlip.

    

2Back to top Go down    Re: Steering on Fri Jun 30, 2017 8:59 am

Holister

avatar
Life time member
Life time member
Hi Bunya. Not sure which parts you're referring to. Can you identify them in this parts drawing.

Also what model/year bike is yours. If you can throw up the last 7 digits of your VIN, this will help.

Cheers


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

3Back to top Go down    Re: Steering on Fri Jun 30, 2017 9:15 am

Bunyak100

avatar
active member
active member
Item 1 lower triple it has the stem pressed into it, would like to remove the stem

    

4Back to top Go down    Re: Steering on Fri Jun 30, 2017 10:10 am

Holister

avatar
Life time member
Life time member
I've never had the stem and lower triple clamp apart and I don't remember reading anything in the manual about those parts separating. I'd guess its an interference fit and If it's bent I'd suggest finding another from a wrecker.
Others may have had a different experience with that.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

5Back to top Go down    Re: Steering on Fri Jun 30, 2017 10:27 am

duck

avatar
Life time member
Life time member
Why do you need to remove it to see if it's straight? Why not place the fork tree on a flat level surface and use a square to see if the stem is perpendicular?


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

6Back to top Go down    Re: Steering on Fri Jun 30, 2017 8:56 pm

RicK G

avatar
VIP
VIP
The Clymers manual does say that BMW recommend that to remove the lower head bearing to press the stem out to get the bearing off the stem but when I saw that I thought WHAT you gotta be kidding all that will do is after three changes make it more likely the stem would move.
Message here: yes it can be done would I do it, definitely no unless it absolutely had to be done in unusual circumstances.
If a new clamp/stem is needed I doubt a stem would be easy to find so replace the whole thing. Any engineer worth his salt will tell if it's bent without removing it.


__________________________________________________
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
    

7Back to top Go down    Re: Steering on Sat Jul 01, 2017 7:03 am

jbt

avatar
Silver member
Silver member
The stem can be separated from the triple clamp by pressing it out with an hydraulic press. That's the way you change the lower bearings by the way.
If the stem is not aligned with the tubes above the clamp; don't bother to remove it, change the assembly. It's very probable also that the tubes are bended and that you'll have to change them.

    

8Back to top Go down    Re: Steering on Sat Jul 01, 2017 7:23 am

WoodyAUK75

avatar
Silver member
Silver member
Has anyone here actually done this? I've changed plenty of steering head bearings, but not the K. Chris Harris has a youtube video where he heats the bearing shell with a gas burner. I won't say I've never had trouble getting them off, but I've never failed to remove the bottom bearing. I think it would probably be easier to press the stem out, then press the bearing off, but as Rick said, how many times can you do that. Mind you, I've had the bike 14yrs and not done it, so if I got two more changes out of it, that would probably do it!

    

9Back to top Go down    Re: Steering on Sat Jul 01, 2017 9:50 am

Holister

avatar
Life time member
Life time member
I've only followed Chris Harris's video. A bit involved but easy.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

10Back to top Go down    Re: Steering on Sat Jul 01, 2017 10:31 am

RicK G

avatar
VIP
VIP
To get the bearing off you drive a fine knife blade under the dust shield then a thick blade then a couple of levers, one each side and lever it off. It works well and is very easy and the dust shield is left intact. There is absolutely no need to press the stem out.
If there is a complicated way to do something BMW will go to extraordinary lengths to find it and then say it is the only way.


__________________________________________________
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: Steering on Sat Jul 01, 2017 11:08 am

jbt

avatar
Silver member
Silver member
I've changed many bearings on Ks, and if it can be done without press, it's so simple and easy to do with that it's a pity to proceed the hammer way. You just have to cut two tubes to make tappets.
No mechanical or thermic stress on new bearings, it saves time, the clamp surface and the dust plate. You just need to heat a little bit the clamp and to lubrify it to ease the separation.
The stem is locked in the clamp with fine grooves that ensure it won't move: you have to pay attention when refitting the stem that the grooves face one to one, and of course that the lock window is a the same place than before, don't ask why.
If you don't have press, I suppose it can be done by simply wrenching on a long screw.

    

12Back to top Go down    Re: Steering on Sat Jul 01, 2017 5:30 pm

robmack

avatar
Life time member
Life time member
Since the point of getting the bearing off is to replace, I don't care if I destroy the old bearing in the process. I lever off the outer race shell and remove the ball bearings leaving the inner race shell. Then, I take a Dremel cutoff wheel and cut as much into the bearing shell as possible without nicking any other parts of the stem; most of the time this is on the diagonal. Then a strike with a cold chisel and its off.

I've never had need for pressing out the stem for any reason.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

13Back to top Go down    Re: Steering on Sat Jul 01, 2017 5:36 pm

Dai

avatar
Life time member
Life time member
Wot Rob says. Except that I'm a bit more brutal and use an angle-grinder with a cutting disc.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

14Back to top Go down    Re: Steering on Sun Jul 02, 2017 2:33 am

AndrewP

avatar
active member
active member
@Holister wrote:I've only followed Chris Harris's video. A bit involved but easy.

Just completed new bearing replacement using Chris Harris's youtube video, put stem in freezer over night, heat up bearing a little , put cold stem on level bench, drop on dust seal , drop on hot bearing , put on some grease. Works a treat Wink

Levered the old one off the Rick G way Smileeasy

    

Sponsored content


    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum