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Micha
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Hello Friends,

I have this strange bolt/plug sticking outside of my gearbox, just near the gearbox drain plug (I marked it with an arrow). It is leaking oil and I would like to know what it is and if it is not a big deal to make it stop leaking. According to the parts list, it could be Nr. 1056241 but that is defined as a "cover" (?).
The big bolt near it is the oil drain plug, not original, of course.
Thanks a lot for any explanation, Micha.

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

schrader7032
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San Antonio, TX
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Strange bolt beneath the gearbox;

Did you follow this other thread:

http://vintagebmw.org/forums/viewtopic.php?t=763

Seems like there's some similarities there...

I don't see the parts number you mention. The ETK shows a part 11 13 0 007 163, a screw plug (M14x1.5), and there are two of them. One is obviously the drain plug...but I can't figure out what the other one might be.

Kurt in S.A.

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'78 R100/7 '69 R69S '52 R25/2

Micha
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Strange bolt beneath the gearbox;

No, I haven't seen it, 'till now. Anyway, Saintclair is worried about the non – original drain plug, which obviously went through a change and an improvisation took place. No reference to this strange piece that is also fitted there. Any idea? The parts book describes the separated pieces as spring, stop pin, bolting piece etc. but does not give a name to the whole parts assembly…

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

EuroIron
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Strange bolt beneath the gearbox;

http://www.beemergarage.com/manuals.html

click on transmission

it's the dingleschollfer for the kick starter

ok I'm just kidding about the nomenclature

part numbes 92, 93, 97

pretty sure something mean will happen with 83, 85, and 91, but, not impossible to cure

Micha
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Strange bolt beneath the gearbox;

Yeah, that's it. But what is it??

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

Darryl.Richman
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Strange bolt beneath the gearbox;

That cover or bolt takes the other end of the foot brake return spring. I think you've got the right part number for it. From the drawing, it looks like removing that could cause problems in the kickstarter area.

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Bruce Frey
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Strange bolt beneath the gearbox;

I thought it was the attachment point for the centerstand spring, at least that is how my R6 is set up. The prewar and postwar transmissions cernterstands are similar.

Bruce

Darryl.Richman
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Strange bolt beneath the gearbox;

"Bruce Frey" wrote:

I thought it was the attachment point for the centerstand spring, at least that is how my R6 is set up. The prewar and postwar transmissions cernterstands are similar.

Bruce

There's a special bolt (p/n 10 06 212 "Einhaengebolzen") that attaches horizontally to the left side of the transmission, that takes the centerstand spring. If you look at Micha's photo above, you can see both the centerstand spring and the bolt.

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Micha
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Mystery solved

Darryl was the closest one: Mark Huggett explained to me that this part has 2 functions: Internal – holding spring and pin for kick starter ratchet, and on the outside there are bikes that the return spring of the foot brake lever is hooked on to it.
Always good to ask.

Big Grin

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

Bruce Frey
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Strange bolt beneath the gearbox;

But which bikes had a footbrake return spring attached to that post and what was the part number for that spring?

Based on the Ersatzteillistes on John's Beemergarage, the post was first added to the plug on the R51-R71 models. The foot brake return spring on these models, however, shows to be mounted directly on the foot brake rod. I can find no reference (illustrated or not) to another foot brake spring.

This Ersatzteilliste is a 1941 version, so possibly it was only on the early machines. I will check my early version books tonight....an interesting trivia question.

ciao,

Bruce

Darryl.Richman
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Strange bolt beneath the gearbox;

The R51/2 parts list (in the silver behlfs-katalog) shows the same parts. The return spring (rueckzugfeder, p/n 40 44 217) is shown with the frame parts.

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Bruce Frey
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Strange bolt beneath the gearbox;

AH....there it is. 251 1 72 003 00 for the R51-R71.

The frame diagram for the R51-R71 on Lacko's site is spread over 2 pages. It was illustrated on the front page rather than the rear page where I was looking for it.

With no bike handy to look at, it seems that the orientation of the spring would be more side to side than front to back, is that correct?

I love it when I learn something new about these bikes!

Ciao,

Bruce

EuroIron
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Strange bolt beneath the gearbox;

Micha

you can remove that and reinstall with no problem

takes only a minor bit of finger diddling to get it back in

let me know if you'd like to see pix

I have a couple open

Micha
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Strange bolt beneath the gearbox;

Thanks, I will be glad to watch those pics (michasteinmann@gmail.com).
It is possible that this part is remains from the dinosaur's time Wink , just like the right hand lever of the gear change mechanism, and has no function today. Interesting is, why does BMW not cancel those from-the-past parts? :shock:

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

saintclair2703
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Strange bolt beneath the gearbox;

Well, the plug I was talking about is the drain plug that was replaced with a "compression plug" that is totally bogus. I hope to God I don't have to take out the whole transmission to reove it. So far- it won't come out...

The plug you're talking about has been described as some kind of retainer for a spring. EuroIron says there's no problem with taking it out -in order to put some sealer in there to prevent it from leaking? Vechorik says told me not to use it as a drain plug because the devils of hades will fly out and eat my face.
Might be an improvement for me, but i don't know about the bike.
Anyway, let us (me) know how THAT little project goes.

Any advice on how to get a compression plug out?

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schrader7032
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Strange bolt beneath the gearbox;

"saintclair2703" wrote:

Any advice on how to get a compression plug out?

Have you seen one of these things in the autoparts stores? I mentioned it's a section of rubber capped either side by some metal plates. The nut on the outside just squeezes the two plates together, forcing the rubber to expand outwards, creating a seal.

If it's one of those things, you should just loosen the exposed nut, maybe about 5-8mm so that the threaded rod is exposed. Then grabbing the nut or rod carefully start working the rod back and forth attempting to break the rubber seal with the ID of the engine case hole. It may require some downward force to get it to walk out the hole. If there was a way to apply some shock force to help pull it out of the hole, that would be good. You might try some penetrant liquids to work between the rubber and the engine case to help things slide a bit.

Kurt in S.A.

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'78 R100/7 '69 R69S '52 R25/2

saintclair2703
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Strange bolt beneath the gearbox;

Haven't tried the "walking" part yet. Good idea. I have a feeling there's a good portion of thread left in there, and so far tugging / twisting has not accomplished anything.

It just occured to me to try working a very small screwdriver around the edge... I'm glad we had this little chat! (I think I may have to take off a pipe to get the cross-pipe out of the way.)

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schrader7032
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Strange bolt beneath the gearbox;

Do you expect the hole in the case to be threaded? I'd be careful with working a screwdriver along the edge...

Kurt in S.A.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

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