The rear seal of my tranny is leaking on my '95 R100GS w/ 18,000 miles
(as is evidenced by gear oil leaking out of the drive shaft boots. It
appears that it may be easiest to replace the seal with the tranny
removed first. That way I can also easily inspect the output bearing to
see if that is causing the seal to leak. I am sure there are many tips
and tricks to removing the transmission w/ o removing the engine. Does
anyone have any links to websites that describe this or have any further
insight?

Thanks,

Rob Munach

i find a slight amount of lube in the boot but there's no leakage outside
in my '81 r100rt.
the tranny comes out ok but i have to remove the swing arm pivot pins to do
it.
unless it becomes a real problem, i'd just check the lube level (on the
center stand)
occasionally..
good luck, sammmm

--
toys:
diesel BMW motorcycle, homebuilt electric motorcycle, gold wing trike, honda
gyros, dodge diesel dualie, fiat osca 1500 cabriolet,
W3CYO/R, 145.49, 224.40, 443.300 mhz. repeaters.


"usenet" <(E-Mail Removed)> wrote in message
news:AdvPc.12284$_(E-Mail Removed)...
> Rob Munach wrote:
> > The rear seal of my tranny is leaking on my '95 R100GS w/ 18,000 miles
> > (as is evidenced by gear oil leaking out of the drive shaft boots. It
> > appears that it may be easiest to replace the seal with the tranny
> > removed first. That way I can also easily inspect the output bearing to
> > see if that is causing the seal to leak. I am sure there are many tips
> > and tricks to removing the transmission w/ o removing the engine. Does
> > anyone have any links to websites that describe this or have any further
> > insight?
>
>
> The easiest way to fix that is drain out enough oil to get below the
> center dot in the sight glass. Assuming Rs even have a sight glass for
> checking your oil. It's a long shot but worth a try. If I fill my K100
> over the center dot it will leak every time.

sammmm wrote:

> i find a slight amount of lube in the boot but there's no leakage outside
> in my '81 r100rt.
> the tranny comes out ok but i have to remove the swing arm pivot pins to do
> it.
> unless it becomes a real problem, i'd just check the lube level (on the
> center stand)
> occasionally..
> good luck, sammmm
>
I found about 4 oz. of oil in there. It is coming out of the rear boot
and getting on the rear tire. Not too good! The oil level *was* correct
until the leak started.

Rob Munach <(E-Mail Removed)> wrote in message news:<tbpPc.371403$(E-Mail Removed)>...
> The rear seal of my tranny is leaking on my '95 R100GS w/ 18,000 miles
> (as is evidenced by gear oil leaking out of the drive shaft boots. It
> appears that it may be easiest to replace the seal with the tranny
> removed first. That way I can also easily inspect the output bearing to
> see if that is causing the seal to leak. I am sure there are many tips
> and tricks to removing the transmission w/ o removing the engine. Does
> anyone have any links to websites that describe this or have any further
> insight?
>
> Thanks,
>
> Rob Munach

Not clear if you meant an R100 or an R1000 GS. For an airhead,
you might want to look at Ed Korn's pages: www.cycleworks.net

Not up on oilheads, but suspect replacement gets tricky on both
because of the hookup for the U joint. On an airhead at least,
I'd definitely separate the tranny to make it easier to see and
access.

Rob Munach <(E-Mail Removed)> wrote in message news:<eQJPc.377397$(E-Mail Removed)>...
> sammmm wrote:
>
> > i find a slight amount of lube in the boot but there's no leakage outside
> > in my '81 r100rt.
> > the tranny comes out ok but i have to remove the swing arm pivot pins to do
> > it.
> > unless it becomes a real problem, i'd just check the lube level (on the
> > center stand)
> > occasionally..
> > good luck, sammmm
> >
> I found about 4 oz. of oil in there. It is coming out of the rear boot
> and getting on the rear tire. Not too good! The oil level *was* correct
> until the leak started.

And are you sure it's from the tranny as opposed to the final drive ?
What's the oil level in each ?

Dan Dunphy wrote:

> Rob, A lot of these had a vent at the top of the seal, which should be
> plugged with RTV. There is a tech bulletin on this, but I don't have
> the number. It's easier to do than replacing the seal.
> The main failure of these trannies is that of the front output shaft
> bearing. Some time in the 80's BMW decided not to use the snap ring
> that keeps this bearing on the shaft. 5th gear is helicle cut, and
> therefore puts endloads on this bearing. It gets pushed toward the
> end of the shaft, thus prelading both front and rear bearings. Ball
> bearings will not tolerate end loads for very long. Check your drain
> plug for hair, (a deposit, on the magnet, that looks like black
> toothpaste is normal) and stay out of fifth gear untill the revs are
> greater than 4000, at all times. The fix is to cut a groove for the
> snap ring, and install it. Mine went at 43000, along with the rear
> u-joint.
> Dan
Thanks, Dan.

Rob Kleinschmidt wrote:

> Rob Munach <(E-Mail Removed)> wrote in message news:<eQJPc.377397$(E-Mail Removed)>...
>
>>sammmm wrote:
>>
>>
>>>i find a slight amount of lube in the boot but there's no leakage outside
>>>in my '81 r100rt.
>>>the tranny comes out ok but i have to remove the swing arm pivot pins to do
>>>it.
>>>unless it becomes a real problem, i'd just check the lube level (on the
>>>center stand)
>>>occasionally..
>>>good luck, sammmm
>>>
>>
>>I found about 4 oz. of oil in there. It is coming out of the rear boot
>>and getting on the rear tire. Not too good! The oil level *was* correct
>>until the leak started.
>
>
> And are you sure it's from the tranny as opposed to the final drive ?
> What's the oil level in each ?
Oil level is low in the gearbox, fine in the rear end. Thanks for the
suggestion.

Dan Dunphy wrote:

> Rob, A lot of these had a vent at the top of the seal, which should be
> plugged with RTV. There is a tech bulletin on this, but I don't have
> the number. It's easier to do than replacing the seal.
> The main failure of these trannies is that of the front output shaft
> bearing. Some time in the 80's BMW decided not to use the snap ring
> that keeps this bearing on the shaft. 5th gear is helicle cut, and
> therefore puts endloads on this bearing. It gets pushed toward the
> end of the shaft, thus prelading both front and rear bearings. Ball
> bearings will not tolerate end loads for very long. Check your drain
> plug for hair, (a deposit, on the magnet, that looks like black
> toothpaste is normal) and stay out of fifth gear untill the revs are
> greater than 4000, at all times. The fix is to cut a groove for the
> snap ring, and install it. Mine went at 43000, along with the rear
> u-joint.
> Dan
Dan,

I beleive the '94 and '95 had the circlip.

Dan Dunphy <dandunphy at pcisys dot net> wrote in message news:<(E-Mail Removed)>. ..
> Rob, A lot of these had a vent at the top of the seal, which should be
> plugged with RTV. There is a tech bulletin on this, but I don't have
> the number. It's easier to do than replacing the seal.
> The main failure of these trannies is that of the front output shaft
> bearing. Some time in the 80's BMW decided not to use the snap ring
> that keeps this bearing on the shaft. 5th gear is helicle cut, and
> therefore puts endloads on this bearing. It gets pushed toward the
> end of the shaft, thus prelading both front and rear bearings. Ball
> bearings will not tolerate end loads for very long. Check your drain
> plug for hair, (a deposit, on the magnet, that looks like black
> toothpaste is normal) and stay out of fifth gear untill the revs are
> greater than 4000, at all times. The fix is to cut a groove for the
> snap ring, and install it. Mine went at 43000, along with the rear
> u-joint.
> Dan

Nice webpage on gearbox overhaul

http://homepage.sunrise.ch/mysunrise...ot/gearbox.htm

Rob Kleinschmidt wrote:

> Dan Dunphy <dandunphy at pcisys dot net> wrote in message news:<(E-Mail Removed)>. ..
>
>>Rob, A lot of these had a vent at the top of the seal, which should be
>>plugged with RTV. There is a tech bulletin on this, but I don't have
>>the number. It's easier to do than replacing the seal.
>>The main failure of these trannies is that of the front output shaft
>>bearing. Some time in the 80's BMW decided not to use the snap ring
>>that keeps this bearing on the shaft. 5th gear is helicle cut, and
>>therefore puts endloads on this bearing. It gets pushed toward the
>>end of the shaft, thus prelading both front and rear bearings. Ball
>>bearings will not tolerate end loads for very long. Check your drain
>>plug for hair, (a deposit, on the magnet, that looks like black
>>toothpaste is normal) and stay out of fifth gear untill the revs are
>>greater than 4000, at all times. The fix is to cut a groove for the
>>snap ring, and install it. Mine went at 43000, along with the rear
>>u-joint.
>>Dan
>
>
> Nice webpage on gearbox overhaul
>
> http://homepage.sunrise.ch/mysunrise...ot/gearbox.htm
Thanks for the info. If I get I out, I will probably send it out for
inspection/repair.