Thread: Drivetrain vibration

Is there any chance it got put back together "out of phase"
The shafts are balanced and need to be assembled as they were before dismantleing.Look for alignment marks on the sliding yoke.
Any chance you have bent the shaft slightly off-roading???
Goodluck
Andrew

When I changed the uni i didnt actually remove the sliding yolk from the shaft, and the uni's should be symetrical?

There are no obvious dents or anything from offraoding.

Im guessing there are places around that balance shafts? maybe I just take it down and get it checked?

cheers

Always a safe bet. I believe that the shafts get balanced with the unis attached.

Originally Posted by PeterM

Always a safe bet. I believe that the shafts get balanced with the unis attached.

Yes balanced with the uni's

I would also recheck that the uni joint's are installed centered to the tailshaft and the caps are in position correctly

Also did you install the tail shaft with the sliding yoke in the correct direction /// IE pointing to T/C case and not to the diff ... or vise/verse for your model???

Probably coincidence.

An unbalanced shaft would not cause steering
"shake" ie side to side.
You could feel a gravelly vibration maybe.
There are numerous things that can cause a steering vibration with the starting point of tyre balance/out of round. Try the rears on the front.
Next take the front shaft off and see what it feels like to drive .
It is not possible to put the yolk on the wrong way as it only goes on to teh diff flange two ways both of which are correct. You may have stuffed up the uni fitting it in the driveshaft.
Regards Philip A

Originally Posted by DassaW

Guys a few questions hopefully someone can answer for me.

After changing a uni on my front drive shaft my pinion seal has started to leak, coincidence? or have i put the shaft out of balance causing the seal to leak?

Also would a unbalanced shaft give me steering shake at about 80km?

Thought it was just the tyres, got them balanced the other day (one of them was 700gms out!) but still have a slight vibration through the steering.

Cheers

we had a front uni yoke colapsed when it was not properly greased. Probably nothing to do with your problem though, but make sure you grease them. stearing shake likely to be something else.

Thanks for the replies guys.

Yes I did put the shaft back on the right way, (sliding yolk to t/case) so it must just be the tyres still.

Ive only got the silverstones static balanced and I cant swap front to rear as one of the rear tyres we had to put about 500g of weight on to get it close to balanced as it had a heavy spot.

The vibration is not too bad now but just thought it may have been an issue as the pinion seal is now leaking. Will replace the pinion seal and see if it starts to leak again.

Cheers

Darren

You failed to mention what vehicle it is.

The u-joints on front tailshafts for RRC, 110, defender and disco are out of phase about 45* (not in-phase like rear tailshaft).

This is to compensate for the un-equal angles between the front and rear u-joints. The angles are un-equal because the engine and transmission are angled down to the rear, while the front diff pinion is angled up to the rear.

The rear diff pinion is angled up to the front (parallel with the engine and transmission) so the u-joints on the rear tailshaft are in-phase as expected.

Disco II have a double cardan joint at the t/case end so not the same as the above.

If you take the front tailshaft to a shop that does not know about coil sprung rovers they may make the mistake of putting the u-joints in phase. Then you will have a vibration problem.