"Ian Rawlings" <news06@[EMAIL PROTECTED]
> wrote in message
news:slrng77d34.9bu.news06@[EMAIL PROTECTED]
> On 2008-07-08, steve <steve@[EMAIL PROTECTED]
> wrote:
>
> > Can you state that clearly for me Ian, and would it apply to a 101 ?
The
> > Yokes on the prop should be how far out ? 90 degrees, or just a bit ?
> > Why should the rear prop be lined up ?
Someone is missing the main point. The reason that the yokes and U/Js are
lined up is because the rear diff flange and the rear gearbox output
flange
faces are parallel and as Ian partly explains in the next paragraph the
effect of the acceleration and deceleration of the centre ****tion of the
prop is totally cancelled out by this arrangement.
This cannot be achieved in the front prop as the front diff is angled
upwards and consequently the drive flange faces are NOT parallel. A
compromise is then made and the yokes at each end of the front prop are
usually arranged approximately 60/30 degrees which works quite well but it
has nothing to do with the LENGTH of the prop.
I suspect that as you are introducing too much grease into the joint on
assembly, you are probably unseating the seals and allowing the ingress of
dirt of the abrasive sort when offroading. It's not wise to pump in too
much
grease when servicing either, just 'until you can hear the bacon frying'
as
they say.
Martin
>
> Well basically, the UJs on the landy propshafts aren't continuously
> variable joints, if you force them to work at an angle (as they
> normally do) then if the driven side turns at a constant speed, the
> other side of the joint will "pulse" faster and slower as the joint
> rotates. To cancel this out, on the other end of the propshaft you
> line the other UJ up so the pulsing from one is cancelled out by the
> pulsing from the other. This unfortunately means that the angle the
> shaft works through is lessened, so on the Defender, the front prop
> shaft ends are not aligned, the two yokes that hold the UJ are offset
> by about 45 degrees. In theory this should mean that the front axle
> gets a pulsing drive, it seems it's not noticable though, I've never
> noticed anything too bad.
>
> All the above knicked directly from the Defender service manual, page
> 172, Propellor Shafts.
>
> And for reference, "lined up" means that both yokes on the prop shaft
> are vertical at the same time as each other.
>
> No idea if the above is needed on the 101, the misalignment is only
> done on the Defender front to increase the angle the shaft can work
> through as it's so short.
>
> --
> Blast off and strike the evil Bydo empire!
> http://youtube.com/user/tarcus69
> http://www.flickr.com/photos/tarcus/sets/
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