BMW K bikes (Bricks)

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1Back to top Go down   Lost the Drive Empty Lost the Drive on Sun Oct 11, 2015 9:37 pm

smithy

smithy
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I wasn't expecting to be bringing the bike back on the ute. I was having a great ride on a top morning until I got to Gloucester and things went pear shaped. The bike lost all drive, it can get all gears but still wont drive, clutch seems to work fine but there is a grinding noise coming from the gearbox when in gear and the wheel is turned , I suspect it could have striped some splines I will check it out tomorrow. I would have liked to have been there to help with the spragg, I'm sure you'll get it all back together with no problems Tom.
I'm lucky to have a wonderful wife that travelled 3 hours in the ute to collect me, while I waited in the air-conditioned comfort of the Gloucester bowling club drinking ales, thanks Kay. What a suck hole I am!  

Not a good look for a K, Yes the project bike Gaz

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Lost the Drive Bike_o10

And this is what I found, hardly surprising it wouldn't drive!
 Lost the Drive Clutch10

Now to find what's caused it to happen. Clutch plate has no manufactures name on it that I can see and measures 5mm, I fitted it about 5000 km's ago with a new Pressure plate and cover. In recent weeks I had noticed that the clutch cable adjustment had been varying from tight to loose, and I thought that I had a shagged cable! at least I know the cable is fine now. Could it be a result of an unbalanced clutch assembly!  Any Ideas on causes appreciated.


__________________________________________________
87 K100rs : Vin 9462 
86 K100rt : Vin 9901
Naked
98 K1100lt: Vin 8044
    

2Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Sun Oct 11, 2015 9:52 pm

rawdonball

rawdonball
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Hi Gaz - your clutch plate splines look shagged! This might have introduced an element of 'impact loading' associated with the normal torsional vibration in the drive train which makes spline lube so critical in these bikes. Will you post some pictures of your gearbox input shaft splines as they are likely to be 'toast' (as TWB says), if my theory is correct...


__________________________________________________
'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

3Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Sun Oct 11, 2015 10:48 pm

RicK G

RicK G
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I would say that the centre has been bent out of square and the continual working has fatigued the metal and eventually cracked it.
Possibly bent on removal or instalation from the gearbox hanging on the splines.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


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

4Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Sun Oct 11, 2015 11:33 pm

rawdonball

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It definitely will have been fatigue related with the initiation point most likely being one of the eight rivets as there is permanent stress in these areas due to the rivets being expanded on installation...

The gearbox input shaft is only what - 25mm long? And that clutch disc material will be spring steel - can't imaging being able to bend it with the weight of the gearbox before the shaft disengages BUT i've lost count of the number of times I've been proved wrong....


__________________________________________________
'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

5Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Sun Oct 11, 2015 11:53 pm

smithy

smithy
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@rawdonball wrote:Hi Craig - your clutch plate splines look shagged! This might have introduced an element of 'impact loading' associated with the normal torsional vibration in the drive train which makes spline lube so critical in these bikes. Will you post some pictures of your gearbox input shaft splines as they are likely to be 'toast' (as TWB says), if my theory is correct...

The clutch plate was near new 5000 km ago when I fitted it, and it was well lubed. The splines have been damaged from a result off what has caused the fatigue. Just lucky the splines on the gearbox are still good.


 Lost the Drive Gearbo10


__________________________________________________
87 K100rs : Vin 9462 
86 K100rt : Vin 9901
Naked
98 K1100lt: Vin 8044
    

6Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Mon Oct 12, 2015 12:17 am

smithy

smithy
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@RicK G wrote:I would say that the centre has been bent out of square and the continual working has fatigued the metal and eventually cracked it.
Possibly bent on removal or instalation from the gearbox hanging on the splines.

You could be right rick, the clutch kit I used when I put the bike together was off a spare parts bike I bought that had a recent new clutch fitted. I find it strange that I can't find a manufactures name on the clutch plate.
I have a good spare clutch plate here that you dropped off for me a few months back that I'll fit and see how it goes.


__________________________________________________
87 K100rs : Vin 9462 
86 K100rt : Vin 9901
Naked
98 K1100lt: Vin 8044
    

7Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Mon Oct 12, 2015 5:11 am

Ed

Ed
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@smithy wrote:

Not a good look for a K, Yes the project bike Gaz

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Lost the Drive Bike_o10
Feel for you Smithy , not a good finish to the trip. 
I had a similar feeling at Gloucester last week. Clutch spun out during an overtake attempt . 
reminding me I have to do the RMS. Too busy riding any chance I get.
consolation of the ute is no other bike has had as good a view across the Barringtons as you. well done Kay
hope it doesn't hold you up too much. good luck .


__________________________________________________
1987 K100RT  Ex- police        
1989 K100LT  Ol' Blue and "Kart" the Kamper trailer.  now KAPUT . 
1993 K1100RS  0194321         Colour #690 Silk Blue  aka " Smurfette"
2018 Kart upgrade.
Lost the Drive 10_x_110
    

8Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Mon Oct 12, 2015 5:31 am

smithy

smithy
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Blue Knight wrote:
@smithy wrote:

Not a good look for a K, Yes the project bike Gaz

Enlarge this imageReduce this image Click to see fullsize
Lost the Drive Bike_o10
Feel for you Smithy , not a good finish to the trip. 
I had a similar feeling at Gloucester last week. Clutch spun out during an overtake attempt . 
reminding me I have to do the RMS. Too busy riding any chance I get.
consolation of the ute is no other bike has had as good a view across the Barringtons as you. well done Kay
hope it doesn't hold you up too much. good luck .

Thanks Ed, though sorry to hear your clutch is slipping. It does sound like the seals will need changing in old blue sooner than later.
I've just finished putting it back together this after noon,  I put another clutch plate in and decided to swap out the gearbox for another one that I fitted all new bearings and seals to recently. I'll take it for a run tomorrow and see how it goes.


__________________________________________________
87 K100rs : Vin 9462 
86 K100rt : Vin 9901
Naked
98 K1100lt: Vin 8044
    

9Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Mon Oct 12, 2015 5:52 am

charlie99

charlie99
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crikey smithy  that's a totally buggered clutch plate ...what the hell ???!@!!

good luck with the fix mate ...fingers crossed for you


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OLost the Drive Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

10Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Mon Oct 12, 2015 10:28 am

AL-58

AL-58
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Like a good dog; enjoys a ride home in the ute.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

Lost the Drive K-dogs10
    

11Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Wed Oct 14, 2015 9:26 am

rawdonball

rawdonball
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@charlie99 wrote:crikey smithy  that's a totally buggered clutch plate ...what the hell ???!@!!

good luck with the fix mate ...fingers crossed for you
Looking at those pictures of the clutch disc splines and the G/box input shaft splines again - my guess is that you definitely got an inferior clutch disc. If you can damage the disc splines to that extent without damaging the male splines with which they mate (easy Rossko!!!) then surely there must be a significant quality differential. It's not a tungsten plated gear box shaft now - is it?


__________________________________________________
'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

12Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Wed Oct 14, 2015 4:56 pm

smithy

smithy
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@rawdonball wrote:
@charlie99 wrote:crikey smithy  that's a totally buggered clutch plate ...what the hell ???!@!!

good luck with the fix mate ...fingers crossed for you
Looking at those pictures of the clutch disc splines and the G/box input shaft splines again - my guess is that you definitely got an inferior clutch disc. If you can damage the disc splines to that extent without damaging the male splines with which they mate (easy Rossko!!!) then surely there must be a significant quality differential. It's not a tungsten plated gear box shaft now - is it?
It's not a tungsten plated gear box shaft now - is it? I wish it was , it's probably not the best pic of the gearbox splines I should have had the camera on a slight angle to show the length of the splines, showing the sharper points.
I've got the bike back together now, and yesterday took it for a 200km test run and all is well. I'm still none the wiser on what caused the problem, but I do suspect inferior quality clutch plate, now it's got a Sach's disc fitted.


__________________________________________________
87 K100rs : Vin 9462 
86 K100rt : Vin 9901
Naked
98 K1100lt: Vin 8044
    

13Back to top Go down   Lost the Drive Empty Re: Lost the Drive on Wed Oct 14, 2015 5:25 pm

92KK 84WW Olaf

92KK 84WW Olaf
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You did mention the clutch wasn't brand new. My guess is that it suffered from an unsupported clutch spline lube or when it was being fitted on the previous bike. But its great to be back up and running.


__________________________________________________
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 98,780 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 32,600 miles
    

14Back to top Go down   Lost the Drive Empty Lost the Drive on Thu Oct 15, 2015 2:16 am

Tom FKR

Tom FKR
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Good to be running again Smithy. It looks like a shonky clutch plate or had been damaged previously somehow. Cheers Tom

    

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