As i`m sure some of us can well identify with, when in the early hours of the morn , when we should best be asleep , those small hours do often lend themselves to frequent and repetitive thoughts about forthcoming jobs that need doing on our beloved bikes. I for one am no exception to this, and have often drifted back to sleep feeling sometimes excited and nervous about repairing the likes of the Gear position switch, fronk fork gaiters , the rubber boots, the slightly annoying mini-backfire between 2000-2500 rpm when throttling back, the re-wiring fiasco following the wireloom meltdown,etc. However, that said , I failed to return to sleep last night having spotted and subsequently thought about the above leak!

Its engine oil, I think, rather than transmission oil. Bike is running beautifully with no clutch slip. Its an occasional drip or two. I would like to put my guess to you all and would welcome your thoughts as to whether or not I might be correct, or not,and for how long can i safely try and ignore this.

I think the culprit may well be the Output Shaft Seal ?

once again many thanks for your opinion

John

Yes, this is the output shaft seal leaking.
Replacing the seal is a pretty easy job, but you will have to remove the transmission. The job can be done over the week end.
How long can you drive with a leaky shaft seal? It depends how much money you are ready to spend when fixing it. If the clutch starts to get oil on it, you will have to replace it too.
If it's just starting to leak, I believe that you are safe and the clutch is still in good condition.

For the 1987LT, the shaft seal dimensions are: 50x80x10 and the part # is 11 11 7 666 186

DO NOT try to go with a generic seal. When testing the K100 prototype, BMW had a lot of problems with this seal as it was not working with the engine heat.
When re-installing the new seal, don't push it flush to the engine crankcase. It has to be out by 1mm.

What are you doing next week end?

Bert

Bert ,

Once again I thank you very much indeed.

Am now searching for that sleeping pill I know is in the med box somewhere!

john

jonnyqq wrote:Bert ,
Am now searching for that sleeping pill I know is in the med box somewhere! john

Mine is not sold in the drugstore. The brand name is called GlenMorangie. Take a couple of ounces before going to bed and rest insured that you will have a good night of sleep!
As a matter of fact, I just had a wee bee of it. Yummy!

My brother in law over in Ca swears by fireball, Pops will be bringing some back with him no doubt when he visits next week.

Here is the leaky culprit



Does anyone know whether this is an original bmw seal please? (see output shaft seal tutorial where seal is black).

The pic shows 3 x concentric rings of different colour and consistency, are they all "the seal"?

Last but not least, how do you get the Buggar out!?

any advice once again v gratefully received gents

cork just out at 5.45pm

john

Have just been told buggar is spelt with an "E"

To remove the buggEr ( ) , Roy has found a very efficent solution: Check it here

If you don't have a kid to pull on the sledge hammer, just tie your dog's leash to the seal and then let the cat run in front of the dog. This should give enough tug to dislodge the seal.

Unfortunetly the dog is no more, we do however have Goldfish, maybe with hooks on end of wires and a tasty maggot or two we should get a result. Hopefully will capture event on camera.