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I would order new seals for the transmission, have a look at the neutral switch as well, rear main seal, oil pump housing O-ring, drive shaft boot and fresh gear oil. Then wait for a rainy or in-climate weekend and dig into it. With a good manual, decent tools, a little patience & luck you can get it done in two afternoons.
When you do the job MAKE DARN SURE YOU BLOCK THE CRANK SHAFT BEFORE YOU REMOVE OR EVEN LOOSEN THE FLYWHEEL.
Well, you're going to have to grease those clutch splines anyway....When you pull the gearbox out to do that, you should be able to see if the rear main and oil pump o-ring are behaving.
This would be be a sign they are leaking. The clutch dust has become encrusted on the inside of the bell housing along with a damp area under the oil pump housing. Although this picture was taken after removing the flywheel, you can see this kind of crud and damp spot with it still installed on the crankshaft.
Olaf -
As for the oil on the clutch lever, you can follow the oil up to see where it's coming from. Likely, it's coming from inside the transmission, leaking past the seal...it's #6 in this diagram:
https://www.realoem.com/bmw/enUS/showparts?id=0260-EUR-04-1973-2476-BMW-R75_5&diagId=21_0071/QUOTE]
Im not anywhere near the wrench many of you here are ... how tough is it to replace this seal?
Olaf -
As for the oil on the clutch lever, you can follow the oil up to see where it's coming from. Likely, it's coming from inside the transmission, leaking past the seal...it's #6 in this diagram:
https://www.realoem.com/bmw/enUS/showparts?id=0260-EUR-04-1973-2476-BMW-R75_5&diagId=21_0071/QUOTE]
Im not anywhere near the wrench many of you here are ... how tough is it to replace this seal?
It'a about a 20 minute job to pull the throw-out lever assembly, replace the seal on the bobbin and reinstall the parts.
Best.
Brook Reams.
It'a about a 20 minute job to pull the throw-out lever assembly, replace the seal on the bobbin and reinstall the parts.
Best.
Brook Reams.
Awesome, I was hoping to hear exactly that. My concern was if the seal wasn't accessible externally via removing the lever ... many thanks.
BTW, picked up my "72 in August and have spent many hours since then enjoying your site and learning from you!
Awesome, I was hoping to hear exactly that. My concern was if the seal wasn't accessible externally via removing the lever ... many thanks.
BTW, picked up my "72 in August and have spent many hours since then enjoying your site and learning from you!
Chris,
Cool beans. I believe your will find a write-up showing all the parts, in order, for the throw-out lever assembly.
Best of success in keeping you '72 on the road.
Best.
Brook.
I did some reading and decided I will pull the transmission at some point soon (maybe in the freezing TX winter ) do do at least the following, since the bike has sat so long:
Replace main seal, transmission seal and oil pump seal and grease transmission splines, inspect clutch. Anything else while I am in there? I will buy some special tools, like main seal puller, transmission tool, at this point in my life motorcycle repairs need to be fun!
SNIP ...
I ended up pulling the steering stem out and essentially cleaned and greased the bearings while in place. The old grease had just dried up. It's been fine for quite some time now.
There are 3 transmission seals, the front, rear and shift lever, so I'm not sure which one(s) you plan to replace.
I am thinking that if I have to go in there anyways I'll replace them, doesn't cost too much and I will done for a good while.
My approach is that if something is a major pain to get out or inside of, then do all you can while there. If you can get back to it with not much hassle, maybe waiting until next time could be a possibility. YMMV!