Disco 1 Vibration under load

Hi,

300tdi, manual.

After i hit about 50mph and I'm still (trying) to accelerate, i get a vibration. Very noticable, it's like sitting in a massage chair!

If i'm doing faster, perhaps 70mph and lift of the throttle the vibration goes completely. This is the same for any speed really, lift off and the vibration goes.

Am i right in thinking that this points towards towards the props?

Not a daily driver, 2" lift, heavy offroad use once a month - should i look at getting wide-angle props?

Just don't fancy a prop coming lose and causing damage!

Thanks

Wheel balance

fozt said:

After i hit about 50mph and I'm still (trying) to accelerate, i get a vibration. Very noticable, it's like sitting in a massage chair!

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Check all the universal joints and driveshaft splines plus the rear diff drive flange rubber "donut", any of these are the most likely suspects.
Wheel balance vibe would not go away when you back off the berries.

Gazbo said:

Check all the universal joints and driveshaft splines plus the rear diff drive flange rubber "donut", any of these are the most likely suspects.
Wheel balance vibe would not go away when you back off the berries.

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Hi - What am i looking for with the UJs and driveshaft splines? I don't know what is "bad".

I have had the "donut" flange thing removed and replaced with a UJ.

Cheers.

any movement in the UJs other than in the prescribed direction is a no no, could also be a diff input bearing - give the flange a good tw@tting about and if there is any sort it.

when checking the ujs and diff jack a wheel up and dont have the handbrake on (chock something ffs) movement will be hidden if the diffs are stuck fast with wheels on the ground or the hand brake engaged.

fozt said:

I don't know what is "bad".

Click to expand...

Unless there is pretty obvious "slop" in the UJ's and splines it is always good to drop one end of each of the driveshafts off its mating flange, diff or transfer case and check the articulation of each joint/spline, vibrations can occur from frozen needle rollers in any part of a UJ and you may not feel any slack in it whilst it is connected in place, in this condition you can also check the sliding splines for binding or excessive backlash.
Also whilst in this condition you will find it easier to re-lubricate the uni's and splines.
You have the donut replaced with a UJ, with the a rear wheel off the ground and gearbox in neutral, wheels chocked, handbrake off slowly rotate the wheel and feel it rotates smoothly and has no "notchy" movement, the angle of operation may be exceeding what a standard UJ is capable of.

To help pin point your issue, remove one prop at a time and drive it in 2wd with the diff lock engaged.