Replacing Paralever Driveshafts

[cookie]

right! it's done now. i think it was a wee bit longer than my predicted 10 mins, but who's counting?

should be good for another 500 miles before any more grief

may even get a chance to ride the HOS to poole this afternoon.

 

[Spanish Bob]

may even get a chance to ride the HOS to poole this afternoon.

...and back? Very ambitious.

 

[cookie]

...and back? Very ambitious.

as it goes, it was too 'kin hot to take the bike. couldn't face all that clothing. took mrs cookie's golf with climate control.

lovely

 

[Spanish Bob]

thats the prblem here in Spain. WHen I go for a "proper ride" then I dress up for it. otherwise bollocks. Its either that or not ride, and that is not really an option long term is it!!!! (well unless you own an airhead of course)

 

[fritz]

Well here I am again about to complete the final bits of the new shaft rebuild this eve. last night the wife and I spent nearly 2 hours handling my shaft.........such stamina ! Wot a Bar Steward getting those splines aligned is. First time it took 15 mins..........then I noticed the bearing thingymajigs on the bolts....s**t. Off and start again. 1.5 hrs later sucess. The secret in the end was using a 'c' spanner (suspension adjustment) through the pivot hole and through shaft (far enough away to avoid bearing seals) which steadied it much more than when either crushing Bev's fingers or trying to balance it with a screw-driver.
The folk that manage the off replace and on in a few hours must have seriously good skills or luck !
Another tip - don't use very much threadlock on the pivots - first time I got it undone easily on own, this time a bar steward of a job and nearly broke me arm when it finally gave. Think I'd used more than required - that stuff goes a long way ! A small drop is all that's required with the 500NM torque or whatever it is (joking).
Hope these might help other 'airheads' (we bloody must be).
Just got to fit a new clutch cable and we're off for Corsica. I'll let you know how good the MAG Rescue cover is...............

 

[mikyh]

Congrats!

I hope you'll have a great time in corsica, and all will keep ticking as they should.
I'm also watching my time with the driveshaft as it is realy old. When its time will come I will send it to the german guy, whatever time it takes.

Miky

(I mounted the shaft/bevel in minutes!!! the bevel gear hanging from the shock, without the torquearm, supported, playng with the wheel spindle till it klicked in))

 

[cookie]

i did it 2 ways, i'm a masochist:

1. assembling whole arm on the bench then fitting to bike. very heavy & awkward. also PITA to allign splines from a foot away at gearbox end of s/a.

2. assemble basic s/a to pivots with shaft loose inside. bolt up shaft then fit bevel box. much, much easier. did not need any tools to lift shaft while alligning splines, i just angled lower joint of shaft & offered up bevel box at an angle. very straightforward. you just have to watch the pivot bearings don't all out.

next time i'll use method 2, but fit shaft to g/b first so i can get a torque spanner on the bolts before fitting s/a.

biggest problem i had was findin a torque wrench that went down to 5Nm* (i didn't).

BTW why does manual say to preload to 5Nm then torque to 7.3Nm? shouldn't the preload be higher than the final figure?

oh, and one other point. during the above operations, i replaced the pivot bearings, 'cos they wuz notchy, torqued them up as near as possible to spec. rode bike 50 miles & re checked: they were loose. not the bolts, the bearings. have now re done it.

 

[mikyh]

BTW why does manual say to preload to 5Nm then torque to 7.3Nm? shouldn't the preload be higher than the final figure?

oh, and one other point. during the above operations, i replaced the pivot bearings, 'cos they wuz notchy, torqued them up as near as possible to spec. rode bike 50 miles & re checked: they were loose. not the bolts, the bearings. have now re done it. [/B]

As I recall it's 7Nm preload, then 5. and yes, I did replace the bearings and yes, they got loose and I had to adjust them again.
Miky

 

[cookie]

got the genuine (well, copied) bmw manual in front of me:

BTW haynes says the same but you'd expect that to be wrong

 

[mikyh]

You're right

Strange.
Probably a mistake in translating from German, then copied by Haynes as well.

 

[cookie]

so would you torque to 5 or 7.3 Nm in final tightening?

 

[mikyh]

5 is what I did in mine

As I recall. It got loose after some riding, now after retughtening it seems OK.

 

[cookie]

i'm wondering if pre load should actually be 15 Nm then tourque to 7.3 Nm.

pre load would then be twice final setting as it is with swing arm pivots.

also, 7.3 Nm +/- 0.5Nm is a bit precise for a preload figure.