Rear prop rubber ring

Neildisco300 · Jan 21, 2014

Right replaced my rear prob rubber ring and it dose not look right to me since it looks twisted and squashed.
Can some one confirm that this is correct or have I don't something wrong.

listerdiesel · Jan 21, 2014

It is not right.

It should run almost flat with little distortion.

Not sure how you've managed to do that, I thought it was a pretty simple thing to do.

Note that the thick rubber sections have to be in compression when driving and in tension on the overrun. Genuine parts have arrows moulded into the rubber.

Peter

Neildisco300 · Jan 21, 2014

listerdiesel said:
It is not right.

It should run almost flat with little distortion.

Not sure how you've managed to do that, I thought it was a pretty simple thing to do.

Note that the thick rubber sections have to be in compression when driving and in tension on the overrun. Genuine parts have arrows moulded into the rubber.

Peter

I know it should be easy for me since I have rebuilt nearly the full disco over the last few months.

It's a bearmach part so it's not like its a cheep ****part one.

I'll need to whip it off and take aloof.

listerdiesel · Jan 22, 2014

The best ones are GKN originals.

I use one of the heavy-duty GKN rubbers which are slightly thicker than the originals and need longer bolts, but it has done over 50k miles without problem.

Peter

Tuskenraider · Jan 22, 2014

Do you have cranked rear arms? I found mine did this after i fitted some so swapped the prop for a 200tdi one.

tetsu0san · Jan 22, 2014

Neildisco300 said:
Right replaced my rear prob rubber ring and it dose not look right to me since it looks twisted and squashed.
Can some one confirm that this is correct or have I don't something wrong.

I would say that looks right because your rear prop is not in line with the diff. You must have a suspension lift or something?

thebiglad · Jan 22, 2014

Neildisco300 said:
Right replaced my rear prob rubber ring and it dose not look right to me since it looks twisted and squashed.
Can some one confirm that this is correct or have I don't something wrong.

Well it looks to me like the propshaft/diff assy is under load. If you jack up the rear axle so the wheels are off the ground the transmission will unwind and the doughnut position will look more normal.

Dave

listerdiesel · Jan 22, 2014

tetsu0san said:
I would say that looks right because your rear prop is not in line with the diff. You must have a suspension lift or something?

Jacking the body up does not alter the relationship of the propshaft to the diff by that amount.

Peter

KeepDigging · Jan 22, 2014

It looks to me that the bolts aren't all parallel, and they should be.

Have you got the right spacers/washers in place, and neither of the flanges is damaged ?

thebiglad · Jan 22, 2014

KeepDigging said:
It looks to me that the bolts aren't all parallel, and they should be.

Have you got the right spacers/washers in place, and neither of the flanges is damaged ?

All he needs to do is to lift the back axle a bit to allow the transmission to unwind and all will be perfectly in place, you'll see.

Neildisco300 · Jan 22, 2014

Tuskenraider said:
Do you have cranked rear arms? I found mine did this after i fitted some so swapped the prop for a 200tdi one.

No standard arms but the disco is lifted by 2" on the suspension.

Keepdigging. I have the spacers there and in right order.

I'll try jacking the axel up, dose it need to be lifted so both wheels are off the ground??

tetsu0san · Jan 22, 2014

I am sure it's just because of the lift taking the prop out of alignment with the rear diff. Most people will change the rear prop on a 300Tdi Disco because of this issue. A suspension lift puts a lot of extra stress on those donuts so fitting a 200Tdi prop with a UJ at both ends will be better.

Neildisco300 · Jan 22, 2014

Will I had a second look tonight, removed the ring to make sure I had it fitted to both the input flange and the prob, everything looked ok, re fitted and torqued up and it still looks the same, defo looks like the diff and the prob dose not line up,
Is this because of the two inch lift,
just can't remember the one I moved looking so twisted.

tetsu0san · Jan 23, 2014

Neildisco300 said:
Will I had a second look tonight, removed the ring to make sure I had it fitted to both the input flange and the prob, everything looked ok, re fitted and torqued up and it still looks the same, defo looks like the diff and the prob dose not line up,
Is this because of the two inch lift,
just can't remember the one I moved looking so twisted.

On a Disco without a lift the prop comes straight out of the diff and everything is in line. With a suspension lift it drops the diff down below the prop and actually brings it forwards slightly and that is what you are seeing. It is going to be flexing every rotation of the prop, whereas on a standard ride height it will sit straight and not flex (well, not much anyway).

It shouldn't be an issue but it will put far more stress on that donut than a standard ride height will and it will potentially wear out quicker. Again, this is why people put the 200Tdi prop and diff flange on as then you have a UJ at both ends and not a crappy rubber donut. The donut was there to make pulling away a little smoother and I don't think it was designed for too much off road action.

discool · Jan 23, 2014

"pulling away a little smoother" perhaps that's why the later D1 V8s 1997-98 and maybe 96MYs didn't get fitted with them, they didn't need it.
Although may old 3.5 RR had the original factory fitted one for the 10 years and 100k miles I owned it, never needed replacing.

Neildisco300 · Jan 23, 2014

tetsu0san said:
On a Disco without a lift the prop comes straight out of the diff and everything is in line. With a suspension lift it drops the diff down below the prop and actually brings it forwards slightly and that is what you are seeing. It is going to be flexing every rotation of the prop, whereas on a standard ride height it will sit straight and not flex (well, not much anyway).

It shouldn't be an issue but it will put far more stress on that donut than a standard ride height will and it will potentially wear out quicker. Again, this is why people put the 200Tdi prop and diff flange on as then you have a UJ at both ends and not a crappy rubber donut. The donut was there to make pulling away a little smoother and I don't think it was designed for too much off road action.

Yeah I understand that just did not expect the donut to be that out of shape as the old one sat alittle better, prob because it was shot to bits.

Will look in to doing the 200tdi prop at some point.

SHORT ROUND · Jan 23, 2014

I've attached a piccy of my bearmach donut after only being on the vehicle for 2 weeks. and my discovery has a 2" lift and mine looked like that when I put the donut on.

Rear prop rubber ring

Neildisco300

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