Thread: Resonating Vibration In 110

Check uni joints for tight spots or wear also check the angle of the uni joints in situ from memory 3 degrees is optimum and 5 is getting too high. Also check if the uni joints are phased correctly. If you have dismantled the slip joint you may have the uni misaligned, both ends should be the same ie the slip joint solid piece should be lined up to the solid piece of the tail shaft uni and both movable end piece uni nuckles should match. It is hard to explain in words but look at the shaft and make sure the universal crosses are in line and the shaft bits match.
Hope it helps, vibrations are hard to track especially transient ones.
Gippslander

I'd Check the half shafts for wear on both ends.
I had a Defender with severe vibration provblems. I replaced both props and it didn't stop, so replaced 4 axle shafts and it disappeared.

Originally Posted by Gippslander

Check uni joints for tight spots or wear also check the angle of the uni joints in situ from memory 3 degrees is optimum and 5 is getting too high. Also check if the uni joints are phased correctly. If you have dismantled the slip joint you may have the uni misaligned, both ends should be the same ie the slip joint solid piece should be lined up to the solid piece of the tail shaft uni and both movable end piece uni nuckles should match. It is hard to explain in words but look at the shaft and make sure the universal crosses are in line and the shaft bits match.
Hope it helps, vibrations are hard to track especially transient ones.
Gippslander

I don't think that this is the case with the Defender front shaft, and doing this may be the problem. There should be arrows on the slip joint that show the correct alignment. In theory, there should be a CV joint at the T/C end of the shaft as on the Discovery and RRC since the angles on the two U-joints do not match, but apparently Rover decided they could get away without this on a utility vehicle, and the misphasing minimises the problem. The problem will be exacerbated by the lift.

John

OK so I'm going to suggest the obvious and cheap thing to look at. Bonnet hinge bushes.

Originally Posted by JDNSW

I don't think that this is the case with the Defender front shaft, and doing this may be the problem. There should be arrows on the slip joint that show the correct alignment. In theory, there should be a CV joint at the T/C end of the shaft as on the Discovery and RRC since the angles on the two U-joints do not match, but apparently Rover decided they could get away without this on a utility vehicle, and the misphasing minimises the problem. The problem will be exacerbated by the lift.

John

DITTO,

Defender & RRC & Disco front shafts are out of phase,
Shafts should only be in-phase if the Transfer case output flange is parallel to the diff pinion flange, Which most definitely is not on a Defender / RRC because the TC is level & the diff points uphill. I wrote an article on this for the LROCV Review in the 1980's, will see if I can dig it out.

pic below shows 45 deg out of phase per RRC

That is different having been a mechanic for over forty years i have not come across this before. I admit not having worked on many land rovers except an old series one so this would have surprised me. Normal practice is keep the ends aligned due to the action of a universal joint, in motion it speeds up and down as it changes angle/plane thank you for your insight into the minds of the Land Rover engineers it certainly is different.

Thanks everyone, i have been going down this path for the last two months.

The prop shafts have new UJs, have been balanced, but in phase. We try them out of phase but it only made the vibration worse. I'm still not convinced that this is propshaft related.

I will try with the original springs back in , but i fear that may stop the resonance, but not the cause of the resonance which worries me.

The Drive shafts have been inspected and seem ok, It may be easier to replace the entire front axle and see if that stops it. At least i'll have then isolated that component. tomalophicon, did you see anything visually wrong with the shafts before you replaced them?

Its not bonnet related, i have two bonnets (one with a wheel on it) and it happens without a bonnet.

Also it happens under acceleration and decceleration (cruising) and when just rolling out of gear.

Is 2 inches too much lift for standard prop\diff angle to cope with?

Thanks

Originally Posted by r88inch

Thanks everyone, i have been going down this path for the last two months.

The prop shafts have new UJs, have been balanced, but in phase. We try them out of phase but it only made the vibration worse. I'm still not convinced that this is propshaft related.

I will try with the original springs back in , but i fear that may stop the resonance, but not the cause of the resonance which worries me.

The Drive shafts have been inspected and seem ok, It may be easier to replace the entire front axle and see if that stops it. At least i'll have then isolated that component. tomalophicon, did you see anything visually wrong with the shafts before you replaced them?

Its not bonnet related, i have two bonnets (one with a wheel on it) and it happens without a bonnet.

Also it happens under acceleration and decceleration (cruising) and when just rolling out of gear.

Is 2 inches too much lift for standard prop\diff angle to cope with?

Thanks

Whilst its not a puma it sounds like the exact problem I had when I lifted my suspension 40mm (mine is a puma) and this was solved with a DC Shaft.