BMW K bikes (Bricks)


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1Back to top Go down   replacing k100 rear main seal  Empty replacing k100 rear main seal Sun May 03, 2015 3:47 am

k100newbie

k100newbie
active member
active member
Hi all just wondering if when replacing the rear main if the output shaft nut has to be a new one each time of whether it be reused thanks

    

2Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Sun May 03, 2015 5:17 am

Rick G

Rick G
admin
admin
BMW say replace it but I never have and so far no clutches spinning away into orbit or anywhere else


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

3Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Sun May 03, 2015 5:19 am

smithy

smithy
Life time member
Life time member
It should really be replaced each time it's removed, but I have heard that the splits in the nut can be pried open so the nut can be reused. That nut is only cheap, so I would just replace it.


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

4Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Sun May 03, 2015 7:00 am

Ed

Ed
Life time member
Life time member
looks like I'll be going in to search out an oil leak amongst the clutch casing shortly . I'm thinking it is the rear main seal.
what should I be purchasing for this little adventure. There is an an advantage of having PMS at the moment , at least some serious maintenance can take place. just not as much play time outdoors.


__________________________________________________
1993 K1100RS  0194321         Colour #690 Silk Blue  aka " Smurfette"
2018 Kart upgrade.
replacing k100 rear main seal  10_x_110
    

5Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Sun May 03, 2015 7:12 am

smithy

smithy
Life time member
Life time member
You will need the nut that we were just talking about plus the O ring behind the nut & washer in the clutch housing, the rear main seal , and it would be a good idea to order 6 new clutch retaining bolts and lock washers.
A lot of the time you find that the rear main seal is fine, and it's just the O ring that's leaking, but a good idea to change both while your there.


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

6Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Sun May 03, 2015 7:15 am

charlie99

charlie99
VIP
VIP
more likely the oring around the output shaft ...which goes hard ed ..and a bugger to remove unless you break it up with a very fine screwdriver or some such ...so it breaks away in sections

but whilst your in there, might as well linish the shaft for a good surface to wear into and replace the output seal as well


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

7Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Wed May 06, 2015 12:29 am

rawdonball

rawdonball
Gold member
Gold member
Hey Charles99

I am at that point with one of mine. Will you remind me what you do your 'linishing' with?

Also - a guy called Vince here in Perth who rebuilds mainly Old R series bikes - told me that he always installs the new O ring with a loctite brand of silicone sealant. I wondered if you or anyone else would like to comment as to how this fits with your own experience? Personally I am not in favour as I plan to re use the original nut with loctite thread lock and I don't want to risk getting anything on the shaft threads after I have cleaned these with meths prior to installing clutch housing.


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

8Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Wed May 06, 2015 12:36 am

Rick G

Rick G
admin
admin
I have done quite a few and never seen the need for anything other than a new O-ring.
I clean the area where the seal runs with a scotchbrite pad and if you can feel any groove or lip with your fingernail then replace the clutch carrier with a good one.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

9Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Wed May 06, 2015 1:14 am

rawdonball

rawdonball
Gold member
Gold member
Rick - I've only been an Ozzie for 8 years so I Googled Scotch Brite Pad!

Are you talking about the - usually green - pad for hand cleaning of pots (for example). They market a wire wool which they also refer to as a pad - the one I have to use every time my dear wife forgets something on the stove.....


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

10Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Wed May 06, 2015 1:36 am

Rick G

Rick G
admin
admin
The green ones are the go but if my wife burns the porridge then she cleans the mess Laughing 
Did you know that the word porridge is derived from 3 other words Putrid horrid sludge.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

11Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Wed May 06, 2015 4:06 am

rawdonball

rawdonball
Gold member
Gold member
"I clean the area where the seal runs with a scotchbrite pad and if you can feel any groove or lip with your fingernail then replace the clutch carrier with a good one."

To drag you away from the porridge issue Rick - can I conclude from the above that you are not comfortable with the practice of installing the new seal to a depth that is just slightly less than that to which the original seal was installed?


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

12Back to top Go down   replacing k100 rear main seal  Empty Re: replacing k100 rear main seal Wed May 06, 2015 6:40 am

Rick G

Rick G
admin
admin
Some more of the story of the 0.5mm has surfaced and apparently it is because the new seal runs the lip at a different spot unless installed as said.
I have been using a seal that is 80mm x 50mm x 8mm "Viton" where the OEM is 10mm. I remember checking where the lip runs in relation to the OEM and it was about 1mm different but whether it was in or out (more likely out) I don't recall so all I do is make it flush and that has worked well for me. The 8mm seal works out about $12 cheaper than Motobins.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

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