Thread: Disco Drive Shaft

have a look at this site mahn!
have you been greasing the uni cross??
with the right grease??

http://www.4xshaft.com/techinfo.html

if only i had found it when i was buildind me mud buggie, i might'nt
have broken all thoes tail shafts.

phil

Mark every thing before you pull it apart,
Yokes to yokes, slip joints to slip joints and flange to flange,
That way it will be in line when you put it all back together,
the same way it came apart.

Tip:: :wink: Line your grease nipples up on the same plane,
When it comes time to greasing,
you will only have to move the tail shaft once to find the nipples,
(as they will all be in line).
not 3 times, one for ea nipple

Thanks Phil,

That is an interesting site.

Neglect may have been my downfall but I suspect that a faulty u-joint may have been a contributor.

The new drive shaft installed due to spline wear on the old displayed unusual vibrations after a vigorous trip through Duea NP. It may have been binding from new. Although I checked it 20,000 km ago and there was no play then.

I have heard that greasing the u-joint is not always a guarantee as one of the four joints can remain "dry". Both ends of one of the "crosses" have failed. The other pair are fine.

Thanks Hook,

Good advice. Unfortunately in haste positions weren't marked so I will need to apply some grey matter (not to mention grease). [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]

were the crosses removed from the shaft??
it is very easy for a needle roller(just one) to fall into the end of the cap
when assembling the cross, this will destroy a uni in no time flat.

the cross has to move free when put together it shouldnt feel tight or notchy. to free up a newly installed cross you gently tap(with a copper hammer) around the yoke's. this sets the yokes back to normal. if it still feels notchy and stiff after this there is a problem.

ive been doing uni's for years and have never had a failure.
the ones in my disco are 220 000k's old, still the oe ones. i grease them regulary and there is not one bit of play.

use a high temp moly grease, bearing grease wont cut it in a uni!

phil

Thanks Phil.

I am still puzzled by the out of phase angle A-B looks like 45 degrees:



Any clues?

ive been told that the front shaft has to be phased and the angle is 45deg.
but why???
buggered if i know, it will be something simple i imagine.

phil

Originally posted by discowhite
ive been told that the front shaft has to be phased and the angle is 45deg.
but why???
buggered if i know, it will be something simple i imagine.

phil

If you look at the diagram, the answer is there.

Imagine that the unis are in phase. When load is applied to it during an up-cycle of suspension travel, the tops of the unis would both move in towards each other and bind easily. Having them out of phase would allow just one end to move in and limit binding.

That's how I see it, anyway.

Micka