Technical 4x4 vibration

[boatlon]

These have been replaced , as in diff mounts.
When you say cv's you mean front ones.
It's certainly worth checking , I had this on a front driveshaft on two cars I have in my care , including my Gt but they were front wheel drive and the vibration there on acceleration so I could single them out easily enough.
So maybe the wee panda can only get this vibration while part of the 4 wheel system is in place, ie: prop and rear diff.
Will investigate further , thanks for your help in this.

 

[DaveMcT]

I mean check all four drive shafts and check the differential input flange is running true.

 

[boatlon]

will let you know, hopefully today.

 

[boatlon]

So car Has been jacked up on each side, I found the cups had movement where the spider joint lies. Also found that gearbox mount towards the rear of box had excessive movement.
I took a video of each part and will try and load them , would anyone think these movements are enough to create the vibration I’m getting. Near side front , offside then box mounting.

 

[DaveMcT]

Front outer CV joints usually wear first. Drive the car on full lock and listen for clicking noises. It's usually worst on the inside of the turn.

On a CV or U/J joints, any rotational backlash or lateral slack = worn out. They all have ball or needle bearings so there should be zero slack from end to end.

 

[boatlon]

Can’t seem to up load a file on this site , just comes up invalid .
What am I doing wrong please , I shortened vid to 10 secs. even.

 

[boatlon]

A small problem has occurred , because the car has been laid up for a while I cant run the front wheels until the car starts . To cut a small story short the Aux belt sheared when I started to rebuild. The car will not turn over , and I think the cause is a siezed alternator.
I will sort to morrow as since putting on a new belt it refuses to turn over albeit a grunt!

 

[DaveMcT]

It's not unusual for the alternator rotor to corrode and seize the whole thing. Take off the belt and see if it starts.

 

[koalar]

vibration at 40

is it the different or the same in 4th or 5th gear

worse or the same under uphill or downhill

worse or the same accelerating or deaccelerating

 

[koalar]

lets see if I have got this right

prop shaft centre bearing has been replaced

rear diff mounts have been replaced

fine with the prop shaft removed

noisy with the rear drive shafts removed

have you checked for wear/movement in the universal joint

 

[boatlon]

So the Panda is on my ramp now and jacked up at the front , no rear half shafts in place .
Ran the car in gear with help and the rear differential is the culprit doing the vibration.
Took the prop off to get the diff down and the cv joint in the rear end was solid . Bear in mind this half of the prop is the original half that came with the car as I bought another s/h one off the net , split that one to replace the support bearing and used the old half as it had the protective rubber in place. I did not realise at this point that the cv joint was in fact seized.Took the end joint off and discovered why we were getting the vibration.
Someone has assembled the cv into the cap the wrong way round!

No more vibration!

 

[DaveMcT]

There was a time when U/J joints were replaceable - the bearing caps were retained with circlips. Sadly no more. They are staked with a special press tool. They "can" be replaced, but parts are hard to find and you need a stake tool (or great skill with a centre punch) and a vee block jig to keep it all aligned.