ADVrider

Go Back   ADVrider > Bikes > Old's Cool > Airheads
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 04-29-2013, 07:50 PM   #1
Big Bamboo OP
Aircooled & Sunbaked
 
Big Bamboo's Avatar
 
Joined: Sep 2010
Location: Big Island of Hawaii
Oddometer: 2,774
U-joints; Twin Shock vs Paralever

I know the twin shock BMWs require a bit of gear oil in the swingarm, but the Paralevers do not. Are their U-joints of a fundamentally different design, such that a Paralever is lubricated for life? Or is the oil there primarily to lubricate the splines where the shaft mates to the rear drive? (done with grease on the Paralever)
Big Bamboo is offline   Reply With Quote
Old 04-29-2013, 10:31 PM   #2
bmweuro
Mad Scientist
 
bmweuro's Avatar
 
Joined: Nov 2003
Location: Chico, California
Oddometer: 3,321
Quote:
Originally Posted by Big Bamboo View Post
I know the twin shock BMWs require a bit of gear oil in the swingarm, but the Paralevers do not. Are their U-joints of a fundamentally different design, such that a Paralever is lubricated for life? Or is the oil there primarily to lubricate the splines where the shaft mates to the rear drive? (done with grease on the Paralever)
The u-joints are the same on pretty much all BMW's produced after 1970, minus the new new bikes. The oil in the early bikes did more for the splined end at the rear drive.
__________________
BOXER Metal
BMW Biker Scum
BMW Mad Scientist!
VBMWMO #7770, BMW MOA #48694 & Airhead BMW Club #600
bmweuro is offline   Reply With Quote
Old 04-30-2013, 03:44 AM   #3
More_Miles
über-n00b
 
More_Miles's Avatar
 
Joined: Aug 2009
Location: New Brunswick Canada
Oddometer: 312
Quote:
Originally Posted by bmweuro View Post
The u-joints are the same on pretty much all BMW's produced after 1970, minus the new new bikes. The oil in the early bikes did more for the splined end at the rear drive.
While I don't disagree about being mostly for spline lubrication, I think there is more than a little oiling going on at the U-joint on the twin-shock models. I base this solely on the personal and anecdotal observation that I've never removed the rubber boot at the transmission output without having to dump a tablespoon or so of oil out of it. It had to get there somehow, and once there, probably provides some splash lubrication with bumps, jolts, etc. In my opinion, any lubrication in this application, even accidental (at least in a closed system like a twin shock swing arm anyway) is better than none.

The description "lubricated for life" is accurate. Bearings, joints and the like usually die through lack of lubrication. I'm sufficiently old-school to still want grease fittings on U-joints, ball joints, and bearing oilers where appropriate.
__________________
Larger than life and twice as ugly!
My photos: stewie.smugmug.com
More_Miles is offline   Reply With Quote
Old 04-30-2013, 04:13 AM   #4
ME 109
Beastly Adventurer
 
ME 109's Avatar
 
Joined: Jun 2009
Location: Albury Australia
Oddometer: 1,879
What about the dust seals on uni joints?
They probably prevent any significant amount of oil from getting into the needle rollers.
I cant remember what the oe uni joint looks like, but the Hardy Spicer unit I used as a replacement on my RS had dust seals on it. As far as I can remember, I didn't take them off and that was a long time ago.
__________________
Lord of the Bings
ME 109 is online now   Reply With Quote
Old 04-30-2013, 10:53 AM   #5
SOLO LOBO
airhead or nothing
 
SOLO LOBO's Avatar
 
Joined: Mar 2004
Location: Shoreline, WA
Oddometer: 8,547
Here's a shot of the joint on my R80G/S.. the factory one being replaced by an HPMGuy replaceable one...

__________________
"punkrocks what it's all about" - J. Strummer



Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
SOLO LOBO is offline   Reply With Quote
Old 04-30-2013, 01:10 PM   #6
bmweuro
Mad Scientist
 
bmweuro's Avatar
 
Joined: Nov 2003
Location: Chico, California
Oddometer: 3,321
Here is a driveshaft I built for one of my projects. Part /6 and part R1150 showing the u-joints are all the same. With that said the paralever models do not have oil in the housing and the u-joints last just as long as the earlier models.

__________________
BOXER Metal
BMW Biker Scum
BMW Mad Scientist!
VBMWMO #7770, BMW MOA #48694 & Airhead BMW Club #600
bmweuro is offline   Reply With Quote
Old 04-30-2013, 02:11 PM   #7
ME 109
Beastly Adventurer
 
ME 109's Avatar
 
Joined: Jun 2009
Location: Albury Australia
Oddometer: 1,879
Quote:
Originally Posted by SOLO LOBO View Post
Here's a shot of the joint on my R80G/S.. the factory one being replaced by an HPMGuy replaceable one...

Interesting, half circlip and half welded washer.
__________________
Lord of the Bings
ME 109 is online now   Reply With Quote
Old 04-30-2013, 02:28 PM   #8
Stagehand
+/- V TDSPP
 
Stagehand's Avatar
 
Joined: Oct 2004
Location: Shawangunks
Oddometer: 25,076
Quote:
Originally Posted by ME 109 View Post
Interesting, half circlip and half welded washer.
welded washers hold the circlips in
__________________
Unintentional psychokinesis.
Stagehand is online now   Reply With Quote
Old 04-30-2013, 02:38 PM   #9
ME 109
Beastly Adventurer
 
ME 109's Avatar
 
Joined: Jun 2009
Location: Albury Australia
Oddometer: 1,879
Quote:
Originally Posted by Stagehand View Post
welded washers hold the circlips in
So what's with the shaft in the pic, only two washers?
Washer and circlip doesn't make much sense to me, either way should be good on its own.
__________________
Lord of the Bings
ME 109 is online now   Reply With Quote
Old 04-30-2013, 02:57 PM   #10
Stagehand
+/- V TDSPP
 
Stagehand's Avatar
 
Joined: Oct 2004
Location: Shawangunks
Oddometer: 25,076
Quote:
Originally Posted by ME 109 View Post
So what's with the shaft in the pic, only two washers?
Washer and circlip doesn't make much sense to me, either way should be good on its own.

Sorry- to retrofit the circlips onto the shaft, where the cardans were originally staked in, washers need to be welded onto all four apertures. They become the de-facto "hold the circlips in" devices. Without the washers which are not longer washers in this application, but have become forward material to bear against the outer surface of the circlip, you would have to somehow grind a trough out of the yoke material for the circlip to ride in to hold the cardan in.
There probly isnt enough material there to do that job, even if you could grind an interior radius like that, so you weld a washer on top, and the space between becomes the shelf where the circlips ride.

Clear as mud, eh? :lol
__________________
Unintentional psychokinesis.
Stagehand is online now   Reply With Quote
Old 04-30-2013, 03:11 PM   #11
ME 109
Beastly Adventurer
 
ME 109's Avatar
 
Joined: Jun 2009
Location: Albury Australia
Oddometer: 1,879
I just used washers, although a belt and suspender approach can't hurt.

__________________
Lord of the Bings
ME 109 is online now   Reply With Quote
Old 04-30-2013, 03:24 PM   #12
Stagehand
+/- V TDSPP
 
Stagehand's Avatar
 
Joined: Oct 2004
Location: Shawangunks
Oddometer: 25,076
Well the whole point of circlips is that theyre replaceable ie rebuildable without future grinding and welding

Like putting clips on your suspenders and not sewing your belt to your pants :)
__________________
Unintentional psychokinesis.

Stagehand screwed with this post 04-30-2013 at 07:12 PM
Stagehand is online now   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 07:44 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014