Leak out of clutch actuator arm - replace gasket?

[BMWcyc]

Has anyone had a leak out of the back transmission cover where it looks like its coming from the clutch actuator arm?   After rebuild, I re-used the original parts and didn't know if it would be worthwhile to to change the gasket ring (Part # 21521020109) and cup (Part # 21511230109).   It isn't a big leak...but annoying since everything else is nice and dry.

Thanks in advance.

[Barry]

Welcome

Are we taking about items 6 and 7 respectively. If so I've had mine apart without replacing the gasket ring item 6 (which is the piston seal if I remember) and cup (rubber boot) item 7.   You have to wonder at the part fiche descriptions. They seem to lose something in the translation.

Is it just me or is the rubber boot shown much too big in this diagram.

Anyway I have no significant leaks but I wouldn't exactly call the area dry.

[Bob_Roller]

What year bike do you have ?

Starting with the '81 model year bikes, the clutch arm parts were changed from the 'first generation' R65's .

My first guess would be a tear in the rubber boot/cup part #7 .

With the '81 and later bikes, the spring, #14 is inside of the boot, if you don't loosen the worm gear clamp on the boot before removing the clutch arm pivot bolt, the spring will expand and put excess pressure on the boot and possibly tear it .

I've only let that happen once .

[BMWcyc]

My bike is a 1975 and (plug your ears please) it's actually an R75/6.  Yes, it has that funky spring but no boot over it.   clutch has been working great...and in fact the bike runs great since getting her back on the road about 8,000 miles ago.

I did have a leak due to a funky gasket on the tranny drain plug...fixed by proper crush washers during last change.   Since that's all nice and dry.... i now noticed a drip running down the back of the cover after about a 2 hr ride where we were clipping along  ...er... at a pretty good clip.

I'm guess the leak due the plug not being properly sealed off probably masked this problem since it was generally wet back there.

[nhmaf]

I think/thought that there was a 'wool' / fibrous "gasket" in the back of the older transmissions, like the /6 that went in there, or is that #6 in the fiche?

[BMWcyc]

The fiber element in mine is illustrated by the #2 part in the diagram.