propshaft rebuild

[mikeyboy]

something to read while you have your morning coffee
first,take a worn out propshaft,it is normally a good idea to do this before it disintergrates

 

[mikeyboy]

carefully dismantle the u/j.
this does not involve smashing it to bits with a hammer

 

[mikeyboy]

very important,the yokes must be absolutely free from burrs before attempting to rebuild

 

[mikeyboy]

now is a good time to fit the new snap ring in the gearbox end

 

[mikeyboy]

carefully press the new bearing cups in

 

[mikeyboy]

and set to the correct depth.
too deep and it will be tight,not good
i use my special tool

 

[mikeyboy]

then the yokes need to be repeened

 

[Wilde]

Well done mate. Says something for vhainvand sprockets, but then its only once in a while. .....we hope. Thanks for the pics.

Sent from my GT-I9300 using Tapatalk

 

[mikeyboy]

job done.
on this shaft i have fitted a centre lube type u/j to the lower final drive joint.
although one CAN be fitted to the upper joint the grease nipple will foul the protruding gearbox shaft,so it has to be removed and blanked prior to fitting to the bike.
i prefer to fit a plain sealed u/j kit.

 

[Shunt]

Nice job, Where did u get the splice from? Part numbers would be great for future

 

[jags]

uj's

well done. used to sometimes do agricultural pto shafts, not the easiest of jobs. remember to tell the owner not to go daft with the grease gun, only needs 1 shot/yearly. ag ones run at 1000rpm and at wider angles. subject to a lot of abuse. does anyone know the revs of the bike ones?

 

[Bendy toy]

http://www.bmwmotorcycles.com/us/en/bikes/media/R1200GS.pdf

Top gear = 0.84:1
Final drive = 2.9:1

My primary school sums reckon at 4,500 engine revs in top gear, the shaft is spinning at 3780 (or is it 5357). Whatever - the shaft is going at quite a pace so worn joints will soon cause vibrations and spline damage on the gearbox and final drive stubs.

 

[Deleted account 211025001]

Nice reminder Mike that I really need to get off my arse and get mine over to you for some TLC

Andres

 

[Bendy toy]

At the revs that shaft is going and the joint angles (especially on the GSA), it's a surprise that ordinary UJs can cope.

 

[Sgt Bilco]

Nice reminder Mike that I really need to get off my arse and get mine over to you for some TLC

Andres

Same here

 

[Bendy toy]

I've changed car propshaft UJs, but considerably larger than a bike propshaft. In the old days they had circlips holding the bearings. These days the metal is staked with a special punch to hold the bearing caps in place. Difficult to rebuild accurately

 

[Pukmeister]

I've changed car propshaft UJs, but considerably larger than a bike propshaft. In the old days they had circlips holding the bearings.

Same here, done a few Hardy Spicer UJ's but these are small, staked in place and I'm not tooled up for them so I'd be better off sending them to Mikeyboy for a rebuild.

 

[Bendy toy]

Mike cuts the old stakes out and dismantles. The new UJ cross is fitted and properly aligned with correct end float and then he centre pops the edges to retain.

This would be so much easier if the manufacturer had fitted circlips, but penny pinching and throw away products is the way of today.

 

[Pukmeister]

Is Mike away at the moment?

Tried by a PM and also gave him a call with no reply ??

 

[Bendy toy]

He's in Italy. I believe he's back next weekend.