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Old 10-17-2013, 12:21 PM   #16
patrkbukly
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Hornets nest...

OK but...let me ask this;

My 93 PD is a paralever,
My 80 RT is the monolever.

What should I be doing for each of these?
Is one more seal-worthy?

The spares I bought (seals, bearing, shims) are for my PD.

I dont like that smell in the mornings...or the evenings.
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Old 10-17-2013, 12:35 PM   #17
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Quote:
Originally Posted by patrkbukly View Post
OK but...let me ask this;

My 93 PD is a paralever,
My 80 RT is the monolever.

What should I be doing for each of these?
Is one more seal-worthy?

The spares I bought (seals, bearing, shims) are for my PD.

I dont like that smell in the mornings...or the evenings.
You should not be worrying about them.

I know little about paralevers although I've heard of enough issues I don't want one. Complex, heavy and they don't do anything I particularly need done either. I believe the shaft is running dry so oil transfer from the shaft to the drive from a bad pinion seal should be a non-problem.

If you have drain holes in the mono-drive, keep them clear.

Both of those are newer designs than the drives I've worked on. I would assume the engineering would get better tho' I have seen BMW go backwards here and there. (like omitting the drain holes).

I had no issues with the drive on my K at 75000 and rather liked it...but that thing had a bit more power than an airhead.
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Old 10-18-2013, 06:15 AM   #18
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Quote:
Originally Posted by patrkbukly View Post
I have never had a final drive seal break. ... looking at the oil in this thread pictures was this not changed frequently enough....or does one have nada to do with the other and you are either a person who has had a final drive seal leak, or a person who WILL have a final drive seal leak?
Seals can get old and hard, but it takes a long time. The seals in your Paralever might never do it. That old twinshock in the picture is just due for a refresh; it's ancient AND clogged with spline grease. Unlikely it has anything to do with oil changes.

Quote:
Originally Posted by patrkbukly View Post
My 93 PD is a paralever,
My 80 RT is the monolever.

What should I be doing for each of these?
Is one more seal-worthy?

The spares I bought (seals, bearing, shims) are for my PD.
If your RT is from 1980 it will be a twinshock, not a mono. Monos are more or less like Paras for these purposes.

Your buddy probably didn't have a seal problem but rather a bearing problem that destroyed the seal. You are VERY unlikely to have this with your PD, but if you want to keep carrying that stuff around go ahead. Some day, some 1150 owner will be happy you have it (same parts).
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Old 10-18-2013, 07:20 AM   #19
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Anton knows....

I did not know the R100PD bearing and seals were the same as an 1150. That is actually cool to know.

Yes my 1980 R100RT I thought was called a monolever...mine is 1st one on left;
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Old 10-18-2013, 07:31 AM   #20
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Mono means single. Monolever, single arm. Your swing arm has two sides or two levers or Bi-lever (if such a word exsists). Monolever has a single shock, your's has two shocks. You just got the names mixed up is all.
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Old 10-19-2013, 07:26 AM   #21
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Originally Posted by AntonLargiader View Post
Clearly the drain is clogged, probably both are, and I can't imagine that the inner seal is perfect. Why not do the job right, or get someone else to? The new gasket will probably change the shimming anyway, so that will take some attention (but again, only if you want to do it right).
Yeap... the Mike Holmes of Airheads talked me into it. I'm doing it right. Taking it too a seasoned professional for an overhaul. Thanks Anton.

In case you southern gents don't know Mike Holmes...
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Old 11-27-2013, 05:58 AM   #22
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Reading last night...

Quote:
Originally Posted by AntonLargiader View Post


If your RT is from 1980 it will be a twinshock, not a mono. Monos are more or less like Paras for these purposes.

.
Hey Anton,
I was reading last night and Paralever refers to the 2 joints on the shaft as opposed to mono which refers to 1 joint. Not the number of shocks.

Is that what you meant?
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Old 11-27-2013, 06:26 AM   #23
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Quote:
Originally Posted by patrkbukly View Post
Hey Anton,
I was reading last night and Paralever refers to the 2 joints on the shaft as opposed to mono which refers to 1 joint. Not the number of shocks.

Is that what you meant?
No, because I wasn't trying to define those terms in my post. I meant to point out that your RT is not a mono, and that for the purposes of this thread (gear oil leaking) your PD is like the later Paralevers.

BMW used the term Monolever to refer to the single-sided swingarm (which logically had only one shock). They also had one joint, at first. People also refer to these as monoshock bikes, for the same reason, although that is a generic term. So, take your pick of what 'Mono' means to you, it's all the same up to 1988.

Paralever is BMW's term for the two-jointed single-sided swingarm. It is a monoshock but it is not a Monolever.
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Old 11-27-2013, 09:33 AM   #24
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I stand corrected

Gotcha, It was one of those cases where I thought I was confused, ...then I found out I actually was confused.
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Old 11-27-2013, 10:46 AM   #25
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All Monolevers have just one U joint up until whenever they made the last one. Monolever refers to the the single sided swingarm. Paralever refers to the torque arm and the swingarm. It has nothing to do with the number of U joints. It's a Paralever somewhat in the same sense that a full floating brake is but different. It's a Paralever in the exact same sense that a twin wishbone setup on a car is. It's just that in our case it also happens to drastically reduce drive line torque reactions to the chassis as well.
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Old 11-27-2013, 12:15 PM   #26
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Excuse my ignorance, what and where are these drain holes that have been mentioned?
Happy Thanksgiving to all!

Paul
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Old 11-27-2013, 03:15 PM   #27
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Quote:
Originally Posted by supershaft View Post
It has nothing to do with the number of U joints.
It's that design: Swingarm joints, U-joints, torque arm and all. It has everything to do with it, or nothing to do with it, however you want to envision it. Within the '70-on Airhead family, two driveshaft U-joints is accurate and inherently part of the design.

I personally think 'Parallelogram' although that isn't 100% accurate.
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Old 11-27-2013, 04:20 PM   #28
patrkbukly
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Oreos

I like straight forward stuff….

I propose "the black arm"


or "The silver arm"
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Old 11-27-2013, 04:27 PM   #29
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From the "30 Years of GS" book

"Paralever
The paralever is a further development of the monolever. The system largely eliminated the forces generated by the shaft drive that would otherwise make the suspension harder during acceleration. This righting moment is effectively balanced out - a conventional swing would need a length of over 1.4 meters for this. Unlike the 1987 launch, the current GS generation has the support above the swing, which increases the ground clearance"
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Old 11-27-2013, 06:40 PM   #30
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I think it would be best quoting what BMW said about them when if comes to why they called them Paralevers. Further development of the Monolever??? Such as making it longer? A Paralever has almost nothing in common with a Monolever. Four pivot points versus one. That's like saying the twin wishbone is a development of the straight axle. Well, they both do hold the wheel on but please! They are ParaLEVERS. The only levers involved is the swingarm and the torque arm.
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